Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
335 AM EDT Sat Apr 20 2019
Valid 12Z Sat Apr 20 2019 - 12Z Mon Apr 22 2019
...Heavy to locally excessive rainfall possible across New England on
...Unsettled weather out west, while well above normal temperatures
persist across the Plains states this weekend...
An anomalous upper level low and associated trough across the Eastern U.S.
will drive a cold front north and eastward through the Northeast on
Saturday. While the severe weather threat with this system has ended, the
threat for heavy to locally excessive rainfall will continue into Saturday
across parts of New England. WPC has highlighted this region within a
marginal to slight risk for flash flooding, with flood/flash flood watches
in effect through Saturday afternoon. Unsettled weather will also continue
across parts of the Ohio Valley and Mid-Atlantic through the weekend as
the upper level low meanders over the region before finally shifting off
the coast on Monday. Prior to the cold frontal passage, widespread record
warm overnight temperatures are likely Saturday morning across parts of
the Northeast. Behind the cold front, from the Gulf Coast to the Great
Lakes and into the Mid-Atlantic, temperatures this weekend are likely to
remain below normal, with the greatest departures (15 to 25 degrees below
normal) expected across the Ohio and Tennessee Valleys on Saturday.
Meanwhile, a cold front in the Northwest states will continue to drop
southward into the northern Great Basin and Rockies on Saturday, reaching
the Plains and central Great Basin by Sunday. This will bring
precipitation to much of the Intermountain West this weekend, with mainly
light to moderate amounts expected. Modest snow accumulations are also
possible across the highest terrain of the Northern and Central Rockies.
Warm southerly flow ahead of this system across the Plains will result in
well above average temperatures for much of the central U.S. Afternoon
highs well into the 80s, especially across parts of the Central and
Northern Plains would be greater than 20 degrees above normal for this
time of the year.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php