Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 415 AM EDT Sat Apr 22 2023 Valid 12Z Sat Apr 22 2023 - 12Z Mon Apr 24 2023 ...A cold front will bring a round of showers and thunderstorms through the eastern U.S. with severe thunderstorms possible later today along the East Coast... ...Areas of heavy rain and severe thunderstorms possible next couple of days across southern Texas... ...Mountain snow and coastal/valley showers for the northern/central Rockies and Pacific Northwest; snow will continue to slowly taper off today over the upper Midwest with lingering cold across the Plains and Ohio Valley... A cold front is forecast to move from west to east across the eastern U.S. at a faster pace today. Showers and thunderstorms ahead of the front are expected to sweep through the eastern U.S. The greatest chance for the thunderstorms to become severe will be along the East Coast later today. A sudden onset of heavy rain can be expected as the thunderstorms arrive. However, the relatively fast movement of the front will likely limit the threat of flash flooding at a given location. Cold air behind the front will usher into the eastern U.S. by tonight, ending the recent warm spell across the entire region. By Sunday, a low pressure wave forming on the front will slow down the eastward progression of the front. This will keep New England with a marginal risk of flash flooding on Sunday before the low slowly pulls off the coast on Monday. The aforementioned cold front sweeping through the eastern U.S this weekend will also be introducing an exceptionally cold air-mass, in the form of Canadian high pressure, through the Nation's Heartland this afternoon. Temperatures are forecast to drop below freezing in parts of the central Plains this morning, resulting in the issuance of Freeze Warnings and Watches from eastern Kansas and Nebraska to portions of the Middle Mississippi River Valley. This push of anomalously cooler temperatures will make their way through the Ohio and Tennessee Valleys tonight, then as far east as the Mid-Atlantic and Southeast by this evening. New England will remain under the influence of onshore flow, keeping cooler than normal temperatures locked in over much of the region throughout the duration of the weekend. Sunday has the best odds of the two days this weekend to produce record cold daily maximum and minimum temperatures. Record cold minimum temperatures are forecast in parts of the Central Plains, with record cold daily maximum temps possible in the Southern Plains. Meanwhile, the trailing portion of the front will become nearly stationary across northern Mexico. A wave of low pressure forming over the southern High Plains will interact with an upper-level jet to bring areas of heavy rain with possibly severe thunderstorms over next couple of days across southern Texas. Elsewhere, the Pacific Northwest and both the northern and central Rockies will contend with occasional coastal/valley showers and mountain snow this weekend. The first round of precipitation associated with an upper level disturbance interacting with a frontal boundary will slowly wane by tonight. The next impulse from the Pacific will arrive tonight into Sunday in the Pacific Northwest. This system is forecast to push inland with a re-newed round of mountain snow and valley rain along the Cascades and into the Intermountain West by Monday morning. Kong/Mullinax Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php