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Short Range Public Discussion
 
(Caution: Version displayed is not the latest version. - Issued 0735Z Apr 20, 2019)
 
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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 Saturday... ...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. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php