Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
401 AM EDT Thu Apr 27 2023

Valid 12Z Thu Apr 27 2023 - 12Z Sat Apr 29 2023

...More rounds of heavy rain and severe weather expected to impact the
southern tier states today and into early Friday, followed by portions of
Texas by early Saturday...

...Severe weather with potentially large hail could occur again today near
the east coast of Florida as well as southern Texas...

...Another quick round of wet snow is expected to dive into the northern
Rockies today followed by the central Rockies tonight/early Friday...

...A warming trend across the West could break temperature records by
Friday while below average temperatures are forecast for large portions of
the U.S. from the Rockies eastward...

An active and complicated weather pattern is forecast to bring inclement
weather to various locations across the eastern two-thirds of the country
through the next couple of days.  A low pressure system developing and
tracking through the southern tier states will bring a quick round of
heavy rain and strong to severe thunderstorms from west to east through
the region today into tonight.  Over Florida, daytime heating over sea
breeze boundaries combined with passage of upper-level energy could bring
more instances of severe thunderstorms with large hail near the east coast
of the Florida Peninsula today.  The low pressure system will move into
the eastern U.S. on Friday with a round of moderately heavy rain likely
moving up the eastern slope of the Appalachians and the Mid-Atlantic
states.  Lighter rainfall is expected to move across the Ohio Valley as
well.  By Saturday morning, the southern half of the eastern U.S. should
begin to dry out behind the system while the northern Mid-Atlantic will
start the weekend in a mild and rainy note.

Meanwhile, a low pressure system diving into the northern High Plains will
produce a variety of weather as it presses south and east into the
mid-section of the country.  Higher elevation wet snow of 6-12 inches will
once again be possible as cool air is ushered in and lifted behind a cold
front across the northern Rockies today, reaching into the central Rockies
with 6+ inches of wet snow tonight/early Friday.  By Friday night into early
Saturday, the system will move out into the southern Plains where strong
to severe thunderstorms are forecast to develop.

A strengthening upper-level ridge across the West through late week will
lead to gradual warming of temperatures across the region. Above average
temperatures should be most notable across the West Coast states, where a
few record high maximum/minimum temperatures could be tied or set Thursday
with increasing numbers of potential records by Friday. Temperatures in
the Desert Southwest could exceed 100F, slightly warmer than usual for
this time of year. But from the Rockies eastward, temperatures will
generally be below normal for many areas through late week. Freeze
Warnings and Frost Advisories are in place across parts of the Ohio
Valley/Great Lakes region for another chilly morning today. The next clipper 
system from southern Canada is forecast to reach the northern Plains 
Saturday morning with some mixed rain/snow as it begins to merge with 
another low pressure wave located over the upper Great Lakes where mixed 
rain/snow is also possible.

Kong/Tate


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