Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Wed Apr 09 2025 Valid 00Z Thu Apr 10 2025 - 00Z Sat Apr 12 2025 ...Mixed rain/wet snow from the Great Lakes to interior New England will be followed by a drenching cold rain on Friday over the Mid-Atlantic... ...Below normal temperatures continue across the East while well above normal and near-record warmth builds across the West... ...Severe weather expected across portions of the Mid/Deep South and Tennessee Valley on Thursday... ...Unsettled weather persists over the Pacific Northwest... The main weather maker over the next couple of days across the country will be a low pressure system that is forecast to progressively develop over the eastern U.S. The unusually chilly temperatures across much of the eastern U.S. today are setting up for the development of mixed rain and wet snow from the Great Lakes to interior New England through the next of couple of days as the developing low pressure system passes well to the south. It will take a couple of days for the two main pieces of upper-level troughs dipping into the mid-section of the country to consolidate over the eastern U.S. on Friday. As these troughs begin to merge over the Mid-South, extra instability is forecast to trigger rapid development of strong to possibly severe thunderstorms late on Thursday into early on Friday. By Friday, a low pressure system is forecast to intensify as it begins to track northeastward up into the Mid-Atlantic region where a drenching cold rain is expected to develop and expand northeastward. The increasing northeasterly winds will make for a gusty and rainy end on Friday across the northern Mid-Atlantic while the southern Mid-Atlantic will come under an increasing threat of strong thunderstorms as southerly flow strengthens ahead of a sharpening cold front. In stark contrast, a large upper-level ridge will build over the western U.S. the next few days, resulting in mainly dry weather and well above normal temperatures. In fact, high temperature anomalies across the West will climb to between 10 and 30 degrees above seasonal normal through Friday, translating to highs in the 50s and 60s across the far north/Pacific Northwest, to the 70s and 80s outside of the mountains farther south, to the 90s and lower 100s across portions of the Desert Southwest and southern Plains. High temperatures may even approach or possibly break records for many places Thursday, Friday and into the weekend. Meanwhile, unsettled weather is forecast to continue over the Pacific Northwest as fairly energetic fronts ahead of Pacific cyclones arrive at regular intervals and ride up the northern extent of the strong upper ridge in the Southwest. The next wave of moisture is forecast to move into the region on Thursday before the system pushes farther inland with high-elevation snow from the interior Pacific Northwest into the northern Rockies from Thursday night into Friday. Kong/Miller Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php