Weather Prediction Center

National Oceanic and Atmospheric Administration

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
348 AM EDT Wed Apr 24 2024

Valid 12Z Wed Apr 24 2024 - 12Z Fri Apr 26 2024

...Unsettled weather and severe thunderstorm chances gradually expand
across much of the central United States over the next several days...

...Active fire weather pattern to become situated over the southern High
Plains...

...Above average temperatures shift from the Great Basin to the Plains,
while the West and East remain cool through the end of the week...

The benign weather pattern experienced throughout much of the Nation over
the last few days is expected to conclude as developing upper troughing
over the western U.S. helps create a ripe spring severe weather setup over
parts of the central and southern Plains. This trough is expected to enter
the Southwest by early Thursday and swing into the central Plains by
Friday. At the surface, returning moisture from the Gulf of Mexico will
begin to lift northward today and pool along a gradually lifting warm
front draped across the southern Plains. Combined with a southern High
Plains dryline, a few developing thunderstorms could turn severe today
from West Texas to central Oklahoma, as well as the chances for isolated
flash flooding. A greater severe weather threat exists beginning on
Thursday as a surface cyclone rapidly deepens over the central High Plains
in response to the approaching upper level trough. The aforementioned warm
front is expected to continue lifting northward while the High Plains
dryline pushes east. This environment is anticipated to produce numerous
thunderstorms across the central and southern Plains, with scattered
storms turning severe. The Storm Prediction Center has issued an Enhanced
Risk (level 3/5) for severe weather across parts of
southwest/south-central Kansas and western Oklahoma into the eastern Texas
Panhandle. Very large hail, severe wind gusts, and a couple strong
tornadoes will all be possible. Multiple rounds of heavy rain could also
lead to scattered flash flooding, which has prompted a Slight Risk (level
2/4) of Excessive Rainfall across parts of northeast Oklahoma, eastern
Kansas, western Missouri, and northwest Arkansas. By Friday, the
aforementioned low pressure system is forecast to deepen and slide east
into the central Plains while shower and thunderstorm chances also push
eastward into the Upper Midwest, Middle/Lower Mississippi Valley, and
southern Plains.

Behind the dryline across the southern High Plains, the combination of
very low relative humidity and gusty winds are expected to create Critical
Fire Weather on Thursday and Friday. Any fires that develop will likely
spread rapidly. Outdoor burning is not recommended. Additionally, gusty
winds up to 55 mph could lead to areas of blowing dust.

Precipitation chances will also exist elsewhere across the Nation. A cold
front crossing the Northeast today will spread showers over the region,
with snow showers possible across northern New England. Unsettled weather
is expected to develop over the West, Great Basin, and Rockies as well
over the next few days underneath the deepening upper trough. Most
precipiation is expected to remain mostly light, with embedded downpours
and high elevation heavy snow by Friday across the Rockies. This active
weather will also lead to a cooling trend throughout the West compared to
the spring warmth felt over the last few days. Chilly weather is also
forecast across the Northeast through the end of the week as high pressure
builds southward from Canada. Low temperatures could dip below freezing on
Thursday morning and have prompted Freeze Watches to be issued from the
Lower Great Lakes to southern New England. Most of the above average
warmth will be found throughout the Plains, besides of any areas
experiencing prolonged periods of rainfall, with highs into the 80s
remaining across the Southern Tier States until Friday.

Snell


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
256 AM EDT Wed Apr 24 2024

Valid 12Z Sat Apr 27 2024 - 12Z Wed May 01 2024

***Severe thunderstorms and heavy rain expected for the Plains and
Midwest over the weekend***


...General Overview...

An amplified upper level flow pattern is forecast to be in place
across the Continental U.S. this weekend, with a building ridge
across the East and a trough across the West. Multiple shortwave
ejecting across the Plains will spur surface cyclogenesis and
multiple rounds of heavy rain and strong/severe thunderstorms,
mainly from central Texas to Iowa/Missouri. A pronounced warming
trend is expected for the eastern half of the U.S. going into the
beginning of next week, and colder temperatures out West will
support late season snowfall for the higher terrain of the Central
and Northern Rockies. A second trough is then likely to develop
along the West Coast by the middle to end of the next week.


...Guidance/Predictability Assessment...

The 00Z model guidance suite features good overall agreement across
the U.S. on Saturday with similar timing on both of the main
shortwave troughs across the western High Plains and Upper Midwest,
so a multi-deterministic model blend works well as a starting point
in the forecast process. The 00Z CMC becomes a little slower with
the trough ejecting east across the Central Plains by Sunday, but
otherwise the guidance is close in most aspects. Recent runs of the
CMC have differed more across the northwestern U.S. going into the
Monday-Wednesday time period, especially with the 12Z CMC that was
much faster bringing the shortwave inland compared to the model
consensus, so the fronts/pressures was based on the better
clustered GFS/ECMWF and their ensemble means for the latter half of
the forecast period. The QPF forecast started with about 50% NBM
and 1/6 each of the GFS/ECMWF/CMC through Sunday, and then trending
to about 2/3 NBM and removing the CMC Monday and Tuesday.


...Weather/Hazards Highlights...

The overall synoptic environment will be increasingly conducive for
episodes of excessive rainfall across portions of the
central/southern Plains and into portions of the Midwest states
over the weekend. There will likely be multiple mesoscale
convective systems that develop from central Texas to Missouri, and
there is a good chance of training convection given the slow
overall progression of the frontal boundary and nearly
unidirectional flow through the lower to middle troposphere. For
the Day 4 period Saturday, the existing Slight Risk area from the
previous Day 5 will be expanded to include parts of north-central
Texas where the QPF signal in the GFS/ECMWF has increased, with a
MCS likely to develop. There will likely be another MCS across
eastern Kansas into western Missouri, and both with rainfall rates
reaching two inches per hour with some storms. The core of the
heaviest rainfall should slowly progress eastward for the Day 5
period Sunday across the ArkLaTex region and into southern
Missouri, where a Slight Risk area is planned with a multi-model
signal for some 2-4 inch totals where storms train over the same
areas. There is a good chance that portions of both outlook areas
may eventually need a Moderate Risk in later forecast updates if
the QPF signal continues to remain robust, so this will continue to
be closely monitored.

Elsewhere across the U.S., widespread moderate to locally heavy
rain is expected from Minnesota to northern Michigan on Sunday as
the surface low lifts northeastward, and a Marginal Risk area is
planned to account for that. Another area of enhanced rainfall is
also probable over northeastern Colorado and portions of adjacent
states, where a Marginal Risk remains valid for Saturday. Colder
temperatures moving in across the Intermountain West and the
Rockies behind this storm system will likely result in several
inches of snow for the higher mountain ranges. Rain and mountain
snow is also likely to make a return to the Pacific Northwest for
the middle of next week as the next shortwave trough arrives.

Temperatures will also be making weather headlines as a major
warm-up is expected for most of the country east of the Rockies.
Highs are expected to rise well into the 80s from the
Central/Southern Plains to the Ohio Valley and then reaching the
East Coast by Monday, perhaps reaching 90 degrees in some cases.
These readings are on the order of 10-20 degrees above normal for
late April, and there may be some daily record highs set. The
opposite holds true for the Intermountain West this weekend with
readings 5-15 degrees below average, before things moderate going
into early next week.

Hamrick

Additional 3-7 Day Hazard information can be found on the WPC
medium range hazards outlook chart at:
https://www.wpc.ncep.noaa.gov/threats/threats.php

WPC medium range 500mb heights, surface systems, weather grids,
quantitative precipitation forecast (QPF), excessive rainfall
outlook (ERO), winter weather outlook (WWO) probabilities, heat
indices, and Key Messages can be accessed from:

https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif
https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif
https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html
https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml
https://www.wpc.ncep.noaa.gov/#page=ero
https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4
https://www.wpc.ncep.noaa.gov/heat_index.shtml
https://www.wpc.ncep.noaa.gov/#page=ovw

Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
337 AM EDT Wed Apr 24 2024

Valid 00Z Thu Apr 25 2024 - 00Z Thu May 2 2024

The subtropical high will remain in place to the north of the
state around 30-35N through the end of the week, and then shift to
the northeast and weaken slightly this weekend.
East-northeasterly trade winds will persist, though winds may
decrease slightly over the weekend and veer more to the east or
east-southeast as the high retreats weakens. This pattern will
favor precipitation chances each day for the favored east-facing
terrain, and conditions will remain mainly dry for southwestern
portions of the Islands. A low pressure system is forecast to
develop to the northwest on Friday and bring a trailing frontal
boundary towards the far northwestern Islands next week, but the
front will likely be blocked by the subtropical ridge and remain
northwest of the state, keeping the most impactful weather well
offshore through at least the middle of next week.

Hamrick

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
317 AM EDT Wed Apr 24 2024
Day 1
Valid 12Z Wed Apr 24 2024 - 12Z Thu Apr 25 2024

...A MARGINAL RISK OF EXCESSIVE RAINFALL EXISTS IN AND NEAR EASTERN
OKLAHOMA AND WESTERN ARKANSAS...

...OK/AR...
OK/AR will remain an area of diffluent 1000-500 hPa thickness just
east of a migrating mid- level ridge axis translating east from
the Four Corners region. At the surface, a front will lift north
Wednesday night into early Thursday in advance of the approaching
upper level trough from the Southwest. Mid-level capping should be
minimal based on the forecasted 700 hPa temperatures, under 9C.
Precipitable water values 1-2 sigmas above average for late April
-- 1.5-1.75" -- are forecast by the model consensus to be in place
near and just north of the surface front with elevated CAPE of
1000 to 2000 J/kg (higher to the south) may allow for stronger
cells capable of high rainfall rates. Effective bulk shear/low-
level inflow should increase to 35-40 kts. Non- traditional cell
training within a WNW steering flow near and poleward of the front
could allow for hourly totals to 2" and local 4" amounts. While
the 00Z HREF isn't sold on 3"+ amounts in the area, precipitable
water values in the area have trended upwards each day, and now
the 00z Canadian Regional, though at a smaller scale, supports the
wetter ECMWF solution. Went ahead and introduced a Marginal Risk
in this update.

Roth

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
317 AM EDT Wed Apr 24 2024
Day 2
Valid 12Z Thu Apr 25 2024 - 12Z Fri Apr 26 2024

...A SLIGHT RISK OF EXCESSIVE RAINFALL EXISTS ACROSS PORTIONS OF
THE SOUTHERN AND CENTRAL PLAINS...

A mid-level trough over the southwestern U.S. is forecast by the
to eject out across the central and southern High Plains by Friday
morning, spurring development of a surface cyclone across the High
Plains. Winds at 850 mb will be south to south-southwest across the
Great Plains but with increased magnitude -- up to 50-60 kt --
through Thursday night. Moisture transport will allow precipitable
water values to exceed 1.5" across portions of the Plains and
Midwest. A broad area of instability east of a forming central High
Plains surface low and attendant cold front/dryline, with values
of 1000 to 3000 J/kg from northern TX/southern OK into KS and NE.
Mid-level capping should be minimal based on the forecasted 700 hPa
temperatures, under 9C.

Some degree of convection may be ongoing at the start of the period
over OK/AR but additional development is anticipated to occur
during Thursday afternoon ahead of the cold front/dryline in KS/OK
with thunderstorm development expanding through the evening and
early overnight across TX and northern locations including NE and
IA. Mesocyclones are expected to be embedded within the convective
pattern, ramping up the precipitation potential, despite decently
fast cell motions. Deep layer south-southwest flow supports training
of cells with rains up to 2.5" in an hour and local amounts up to
6". There has been considerable convergence in the model guidance
on the location of the heavy rainfall, so introduced a Slight Risk
for portions of KS, OK, AR, and MO for this update. Flash flood
concerns for southern portions of the Slight Risk area account for
both the heavy rainfall potential on Thursday/Thursday night and
saturating soils caused by heavy rainfall Wednesday night into
Thursday morning. The Marginal Risk area was trimmed to account for
the model convergence seen since this time yesterday.

Roth

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
317 AM EDT Wed Apr 24 2024
Day 3
Valid 12Z Fri Apr 26 2024 - 12Z Sat Apr 27 2024

...A SLIGHT RISK OF EXCESSIVE RAINFALL EXISTS NEAR AND NORTH OF THE
ARKLATEX AND NEAR THE ILLINOIS/IOWA BORDER...

As a surface cyclone pulls northeast across the Plains and Midwest,
moisture and instability will lift northward through the Midwest.
Inflow at 850 hPa will be near or above 50 kts. Precipitable water
values of 1-1.5" should lie across the region. Instability should
be more than sufficient to help organize convection within an
uncapped atmosphere within the warm conveyor belt circulation of
the cyclone. Both Slight Risk areas -- the one near the ArkLaTex
and the new Slight Risk area near the IL/IA border -- account for
the heavy rainfall expected between now and Friday and recent
heavy rains during the past week, which near the IA/IL border have
depressed the 3 hour flash flood guidance down to 1.5-2". Cell
training and embedded mesocyclones are expected to be the main
causes for flash flooding. Hourly rainfall totals to 2" with local
amounts to 4" are anticipated. Trimmed back the inherited Marginal
Risk area across the northern Plains to locations expected to have
precipitable water values of 1"+ .


Roth

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
256 AM EDT Wed Apr 24 2024


The overall synoptic environment will be increasingly conducive for
episodes of excessive rainfall across portions of the
central/southern Plains and into portions of the Midwest states
over the weekend. There will likely be multiple mesoscale
convective systems that develop from central Texas to Missouri, and
there is a good chance of training convection given the slow
overall progression of the frontal boundary and nearly
unidirectional flow through the lower to middle troposphere. For
the Day 4 period Saturday, the existing Slight Risk area from the
previous Day 5 will be expanded to include parts of north-central
Texas where the QPF signal in the GFS/ECMWF has increased, with a
MCS likely to develop. There will likely be another MCS across
eastern Kansas into western Missouri, and both with rainfall rates
reaching two inches per hour with some storms. The core of the
heaviest rainfall should slowly progress eastward for the Day 5
period Sunday across the ArkLaTex region and into southern
Missouri, where a Slight Risk area is planned with a multi-model
signal for some 2-4 inch totals where storms train over the same
areas. There is a good chance that portions of both outlook areas
may eventually need a Moderate Risk in later forecast updates if
the QPF signal continues to remain robust, so this will continue to
be closely monitored.

Elsewhere across the U.S., widespread moderate to locally heavy
rain is expected from Minnesota to northern Michigan on Sunday as
the surface low lifts northeastward, and a Marginal Risk area is
planned to account for that. Another area of enhanced rainfall is
also probable over northeastern Colorado and portions of adjacent
states, where a Marginal Risk remains valid for Saturday. Colder
temperatures moving in across the Intermountain West and the
Rockies behind this storm system will likely result in several
inches of snow for the higher mountain ranges. Rain and mountain
snow is also likely to make a return to the Pacific Northwest for
the middle of next week as the next shortwave trough arrives.

Temperatures will also be making weather headlines as a major
warm-up is expected for most of the country east of the Rockies.
Highs are expected to rise well into the 80s from the
Central/Southern Plains to the Ohio Valley and then reaching the
East Coast by Monday, perhaps reaching 90 degrees in some cases.
These readings are on the order of 10-20 degrees above normal for
late April, and there may be some daily record highs set. The
opposite holds true for the Intermountain West this weekend with
readings 5-15 degrees below average, before things moderate going
into early next week.

Hamrick

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
256 AM EDT Wed Apr 24 2024


The overall synoptic environment will be increasingly conducive for
episodes of excessive rainfall across portions of the
central/southern Plains and into portions of the Midwest states
over the weekend. There will likely be multiple mesoscale
convective systems that develop from central Texas to Missouri, and
there is a good chance of training convection given the slow
overall progression of the frontal boundary and nearly
unidirectional flow through the lower to middle troposphere. For
the Day 4 period Saturday, the existing Slight Risk area from the
previous Day 5 will be expanded to include parts of north-central
Texas where the QPF signal in the GFS/ECMWF has increased, with a
MCS likely to develop. There will likely be another MCS across
eastern Kansas into western Missouri, and both with rainfall rates
reaching two inches per hour with some storms. The core of the
heaviest rainfall should slowly progress eastward for the Day 5
period Sunday across the ArkLaTex region and into southern
Missouri, where a Slight Risk area is planned with a multi-model
signal for some 2-4 inch totals where storms train over the same
areas. There is a good chance that portions of both outlook areas
may eventually need a Moderate Risk in later forecast updates if
the QPF signal continues to remain robust, so this will continue to
be closely monitored.

Elsewhere across the U.S., widespread moderate to locally heavy
rain is expected from Minnesota to northern Michigan on Sunday as
the surface low lifts northeastward, and a Marginal Risk area is
planned to account for that. Another area of enhanced rainfall is
also probable over northeastern Colorado and portions of adjacent
states, where a Marginal Risk remains valid for Saturday. Colder
temperatures moving in across the Intermountain West and the
Rockies behind this storm system will likely result in several
inches of snow for the higher mountain ranges. Rain and mountain
snow is also likely to make a return to the Pacific Northwest for
the middle of next week as the next shortwave trough arrives.

Temperatures will also be making weather headlines as a major
warm-up is expected for most of the country east of the Rockies.
Highs are expected to rise well into the 80s from the
Central/Southern Plains to the Ohio Valley and then reaching the
East Coast by Monday, perhaps reaching 90 degrees in some cases.
These readings are on the order of 10-20 degrees above normal for
late April, and there may be some daily record highs set. The
opposite holds true for the Intermountain West this weekend with
readings 5-15 degrees below average, before things moderate going
into early next week.

Hamrick

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
346 AM EDT Wed Apr 24 2024

Valid 12Z Wed Apr 24 2024 - 12Z Sat Apr 27 2024

...Northern Maine...
Day 1...

A potent shortwave trough traversing the Northeast today will help
to spawn a wave of low pressure in eastern Quebec this afternoon
while rapid cooling on the western flank of the developing area of
low pressure results in a brief burst of moderate snowfall. Latest
forecast calls for generally 1-3" in northern Maine, but given WPC
PWPF shows low chances (10-30%) of snowfall totals >4" west of
Caribou, localized amounts topping 4" cannot be ruled out. Snow
will quickly end Wednesday evening with an unusually cold day late
April day to follow on Thursday.

...The West...
Days 1-3...

A series of upper level disturbances will carve out a broad
longwave trough across the western U.S. that will be responsible
for some late season mountain snowfall from the Cascades and Sierra
Nevada to as far east as the Colorado Rockies. The initial 500mb
disturbance approaching southern California will be responsible for
a burst of heavy snow over the White Mountains along the CA/NV
border today and into this evening. Mountain snow will then pick
up over the Four Corners region by Thursday afternoon as the same
upper trough moves in overhead. Farther north, the next upper
level trough looks to amplify over the Pacific Northwest Thursday
evening. While the lead disturbance over the Four Corners region
will generate some high elevation snow >9,000ft in the Colorado
Rockies through Thursday night, it is the trough along the West
Coast that will be the primary driver in mountain snow Friday and
into the upcoming weekend. By Friday morning, falling 700-500mb
heights over the Intermountain West and a surge in Pacific moisture
allows for more snow to breakout across many mountain ranges that
include the Blue Mountains, the Sawtooth, Absaroka, Tetons, Wind
River, Big Horns, central Great Basin, and the Uinta. By Friday
night, the heaviest snowfall rates are anticipated in the Absaroka
and Wind River Ranges where 500-700mb winds out of the southeast
will lead to additional upslope enhancement in these ranges. These
ranges will remain favored for the heaviest snowfall into Saturday
morning as the 500mb low tracks over the Colorado Rockies.

WPC PWPF shows high chances (>70%) for snowfall totals >8" in the
Sawtooth
of central Idaho, the Absaroka, Wind River Range, and both the
Wasatch and Uinta ranges, all at elevations >9,000ft. The Wind
River Range in western Wyoming sports moderate chances (40-60%) for
snowfall totals >12" through Saturday morning. Note that
additional snowfall is still not over in the Absaroka and the Wind
River Range through Saturday afternoon as the upper trough deepens
over the Four Corners region and spawns a surface low in lee of the
Colorado Front Range on Saturday.


The probability of significant icing is less than 10 percent.


Mullinax

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
256 AM EDT Wed Apr 24 2024

Valid 12Z Sat Apr 27 2024 - 12Z Wed May 01 2024

***Severe thunderstorms and heavy rain expected for the Plains and
Midwest over the weekend***


...General Overview...

An amplified upper level flow pattern is forecast to be in place
across the Continental U.S. this weekend, with a building ridge
across the East and a trough across the West. Multiple shortwave
ejecting across the Plains will spur surface cyclogenesis and
multiple rounds of heavy rain and strong/severe thunderstorms,
mainly from central Texas to Iowa/Missouri. A pronounced warming
trend is expected for the eastern half of the U.S. going into the
beginning of next week, and colder temperatures out West will
support late season snowfall for the higher terrain of the Central
and Northern Rockies. A second trough is then likely to develop
along the West Coast by the middle to end of the next week.


...Guidance/Predictability Assessment...

The 00Z model guidance suite features good overall agreement across
the U.S. on Saturday with similar timing on both of the main
shortwave troughs across the western High Plains and Upper Midwest,
so a multi-deterministic model blend works well as a starting point
in the forecast process. The 00Z CMC becomes a little slower with
the trough ejecting east across the Central Plains by Sunday, but
otherwise the guidance is close in most aspects. Recent runs of the
CMC have differed more across the northwestern U.S. going into the
Monday-Wednesday time period, especially with the 12Z CMC that was
much faster bringing the shortwave inland compared to the model
consensus, so the fronts/pressures was based on the better
clustered GFS/ECMWF and their ensemble means for the latter half of
the forecast period. The QPF forecast started with about 50% NBM
and 1/6 each of the GFS/ECMWF/CMC through Sunday, and then trending
to about 2/3 NBM and removing the CMC Monday and Tuesday.


...Weather/Hazards Highlights...

The overall synoptic environment will be increasingly conducive for
episodes of excessive rainfall across portions of the
central/southern Plains and into portions of the Midwest states
over the weekend. There will likely be multiple mesoscale
convective systems that develop from central Texas to Missouri, and
there is a good chance of training convection given the slow
overall progression of the frontal boundary and nearly
unidirectional flow through the lower to middle troposphere. For
the Day 4 period Saturday, the existing Slight Risk area from the
previous Day 5 will be expanded to include parts of north-central
Texas where the QPF signal in the GFS/ECMWF has increased, with a
MCS likely to develop. There will likely be another MCS across
eastern Kansas into western Missouri, and both with rainfall rates
reaching two inches per hour with some storms. The core of the
heaviest rainfall should slowly progress eastward for the Day 5
period Sunday across the ArkLaTex region and into southern
Missouri, where a Slight Risk area is planned with a multi-model
signal for some 2-4 inch totals where storms train over the same
areas. There is a good chance that portions of both outlook areas
may eventually need a Moderate Risk in later forecast updates if
the QPF signal continues to remain robust, so this will continue to
be closely monitored.

Elsewhere across the U.S., widespread moderate to locally heavy
rain is expected from Minnesota to northern Michigan on Sunday as
the surface low lifts northeastward, and a Marginal Risk area is
planned to account for that. Another area of enhanced rainfall is
also probable over northeastern Colorado and portions of adjacent
states, where a Marginal Risk remains valid for Saturday. Colder
temperatures moving in across the Intermountain West and the
Rockies behind this storm system will likely result in several
inches of snow for the higher mountain ranges. Rain and mountain
snow is also likely to make a return to the Pacific Northwest for
the middle of next week as the next shortwave trough arrives.

Temperatures will also be making weather headlines as a major
warm-up is expected for most of the country east of the Rockies.
Highs are expected to rise well into the 80s from the
Central/Southern Plains to the Ohio Valley and then reaching the
East Coast by Monday, perhaps reaching 90 degrees in some cases.
These readings are on the order of 10-20 degrees above normal for
late April, and there may be some daily record highs set. The
opposite holds true for the Intermountain West this weekend with
readings 5-15 degrees below average, before things moderate going
into early next week.

Hamrick

Additional 3-7 Day Hazard information can be found on the WPC
medium range hazards outlook chart at:
https://www.wpc.ncep.noaa.gov/threats/threats.php

WPC medium range 500mb heights, surface systems, weather grids,
quantitative precipitation forecast (QPF), excessive rainfall
outlook (ERO), winter weather outlook (WWO) probabilities, heat
indices, and Key Messages can be accessed from:

https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif
https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif
https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html
https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml
https://www.wpc.ncep.noaa.gov/#page=ero
https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4
https://www.wpc.ncep.noaa.gov/heat_index.shtml
https://www.wpc.ncep.noaa.gov/#page=ovw