Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Sun Apr 23 2023

Valid 12Z Sun Apr 23 2023 - 12Z Tue Apr 25 2023

...Showers and storms with locally heavy rain linger in New England
Sunday-Monday...

...Areas of heavy rain and severe thunderstorms continue today across
southern Texas...

...Frost/Freeze expected across the central Plains into the Midwest this
morning and Monday morning...

...Mountain snow and coastal/valley showers reaching the Pacific Northwest
will continue to spread into the northern and central Rockies the next
couple of days...

A frontal system will push off the East Coast over the next couple of
days.  However, a low pressure wave forming along the front will become
slow-moving near the coast of New England.  This system will keep showers
and some thunderstorms with locally heavy rainfall possible in the
vicinity of New England through Tuesday morning.  Temperatures will be
much cooler for the East Coast behind the front after a couple weeks of
anomalous warmth. Highs will range from the 40s and 50s in New England,
50s and 60s in the Mid-Atlantic, 70s in the Southeast, and 70s and 80s in
Florida.  Meanwhile, much of the Plains eastward to the East Coast will
remain rather chilly for this time of the year thanks to a cold Canadian
high pressure system. Highs will generally be in the 30s and 40s today.
Some low 50s will be possible Monday. Lows across the Northern Plains will
dip into the teens for some locations which, when combined with blustery
winds, will lead to some frigid wind chills.  Widespread frost/freeze
related warnings and advisories are in effect as below freezing low
temperatures may damage new spring vegetation, and a few record lows may
be broken. Some moderation in temperatures is expected to set in on
Tuesday.

Meanwhile, showers and some more intense thunderstorms are possibly across
southern Texas today as a couple of frontal boundaries converge and
interact with a jet stream aloft. The tendency for storms to continue to
develop and back-build along the boundary will increase the threat of
sustained heavy rain over the same areas which could result in some
scattered instances of flash flooding.  In addition, some of the
thunderstorms are expected to become strong to severe, and may produce a
few instances of large hail and damaging winds.

A frontal system reaching into the Pacific Northwest this morning will
bring more lower elevation coastal/valley rain and some snow showers to
higher elevations of the Cascades. The system will push eastward through
the Great Basin and into the Rockies through the next couple of days.
Upslope flow east of the Rockies along with a fast-moving shortwave aloft
moving southeastward over the region will all lead to steadily increasing
precipitation chances through the forecast period. As we transition
further into Spring, snow chances will be confined to higher elevations in
the mountains with some moderate accumulations possible. Lower elevations
will see rain along with the chance for some thunderstorms. High
temperatures today and Monday will generally be the 50s to low 60s along
the track of the storm system through the Pacific Northwest into the
northern Great Basin and the Rockies. A ridge building in off the Pacific
Coast will keep temperatures warmer to the south, with highs in the 70s
and 80s for most of California and the southern Great Basin and 90s for
the Desert Southwest.

Kong/Putnam


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