Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
436 PM EDT Tue Apr 21 2015
Valid 00Z Wed Apr 22 2015 - 00Z Fri Apr 24 2015
...Severe thunderstorms possible across the southern plains and lower
Mississippi valley Wednesday and Thursday...
...A cold front will bring rain and thunderstorms from the Ohio valley to
the Mid-Atlantic and portions of the Northeast...
...Below average temperatures will persist across the Great Lakes and the
Northeast with a chance for rain and snow...
A cold front moving southward across the plains will bring scattered
showers and thunderstorms to portions of the central and southern plains
tonight. Early Wednesday morning, a more organized area of rain and
thunderstorms may develop across northern Texas and western Oklahoma and
move southeastward toward the lower Mississippi valley during the day on
Wednesday. Additional thunderstorms are forecast to develop late Wednesday
over northern Texas in the warm and moist air south of the cold front and
ahead of a dryline. Additional showers and thunderstorms will be possible
on Thursday from Texas eastward to the lower Mississippi valley south of
the cold front. The Storm Prediction Center is forecasting a risk of
severe thunderstorms Wednesday and Thursday across these areas. Please
refer to the Convective Outlook products issued by the SPC for further
details on the severe weather threat.
A large upper-level low pressure system continues to spin across the Upper
Great Lakes this afternoon, keeping below average temperatures and
scattered rain and snow showers in place. This system will persist over
the next couple days, keeping a chance for rain and snow in place across
much of the Great Lakes. A cold front will move across the Ohio valley on
Wednesday, likely producing a focused area of showers and thunderstorms,
which will move eastward into the Mid-Atlantic and parts of the Northeast.
By Thursday morning a more pronounced surface low pressure system will
develop along the New England coast, bringing widespread rain and possibly
a few thunderstorms to much of Maine. In the wake of this low pressure
system, colder air will spread eastward from the Great Lakes into the
Northeast, where a mix of rain and snow is possible early Thursday.
A Pacific frontal system across the Northwest this afternoon will continue
to move east into the interior West by early Wednesday, spreading areas of
precipitation with it. The majority of the precipitation will fall as rain
at all but the highest elevations with this system as snow levels will be
relatively high. Scattered thunderstorms may also be possible. Another
Pacific frontal system will approach the Northwest on Thursday, bringing
another round of primarily rain at all but the highest elevations.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php