Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 420 PM EDT Fri Apr 30 2021 Valid 00Z Sat May 01 2021 - 00Z Mon May 03 2021 ...Heavy rain and flash flooding across southern Texas will continue into Saturday before shifting into the lower to mid-Mississippi Valley with severe weather possible on Sunday... ...Strong to potentially damaging winds expected to continue across the northern Mid-Atlantic into tonight... ...Heat across the northern Plains will be followed by late-season wet snow over the northern Rockies this weekend... The weather pattern remains quite active this weekend with a variety of hazards over different parts of the nation. First of all, a stalled frontal boundary near the Gulf Coast will continue to interact with a closed upper-level low exiting northern Mexico to funnel Gulf moisture into the Lone Star State. Bouts of showers and thunderstorms, heavy at times, will continue to impact parts of southern Texas through tonight and into the weekend, where a few inches of rain can be expected. The heavy rain will likely lead to flash flooding where the most intense downpours occur. Therefore, WPC has issued a Moderate Risk of Excessive Rainfall near the central portion of coastal Texas into tonight. Rainfall on Saturday will gradually spread further north towards central Texas as the low pressure system slowly lifts in that direction. By Sunday, the focus of moderate to heavy rain will shift northeastward into the lower to mid-Mississippi Valley where severe weather is possible by later in the day. Meanwhile, a deep low pressure system is quickly exiting New England into the Canadian Maritimes. Reinforcing shots of colder air wrapping around the deep low will bring strong to potentially damaging winds across the northern Mid-Atlantic into tonight. Winds could gust as high as 60 mph between northern Virginia and New Jersey, which will likely lead to downed trees and power lines into this evening. In addition to the gusty winds, below average temperatures will bring the chance for late-April snow/rain showers throughout the Northeast and New England into the weekend. Winds will gradually subside on Saturday across the Northeast as the deep low moves farther away. Farther to the west, well above normal temperatures stretching from California to the northern High Plains will shift into the northern Plains on Saturday ahead of an upper-level trough approaching from the Pacific Northwest. This trough will gradually slide across the northern Rockies during the weekend bringing rain for the lower elevations as late-season wet snow is forecast to accumulate over the higher elevations especially during the night. The rain/snow should dip into the central Rockies on Sunday behind a cold front as the upper-level trough exits into the northern Plains. Kong/Snell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php