Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 PM EDT Sat May 09 2020 Valid 00Z Sun May 10 2020 - 00Z Tue May 12 2020 ...Arctic blast to engulf the eastern U.S. with cold, gusty, and wintry conditions over Mother's Day Weekend... ...Toasty Mother's Day Weekend for the West Coast, Great Basin, and Southwest... ...Storm system to generate showers, storms, and some snow from the Midwest to the Appalachians, heavy rain and storms possible in South Florida... A blast of chilly air, gusty winds and a mix of rain and snow can be expected across parts of the Upper Mississippi Valley, Great Lakes and Northeast regions this weekend as a low pressure system moves east from the Central Plains to the East Coast. Some thunderstorms could be severe in the Lower Great Lakes Sunday afternoon. The chance for showers will push into the Mid-Atlantic and Northeast on Monday with some snowfall possible in the central Appalachians. There are numerous Freeze Watches, Warnings, and Frost Advisories are in effect through Sunday morning across the Central High Plains, Northern Plains, and from Alabama to the Northeast. Many daily temperature records are expected to be tied or broken this weekend-- with record low max and min temperatures across much of the East today and more record lows in the Southeast and Mid-Atlantic by Mother's Day morning. Newly bloomed vegetation, as well as, sensitive flower and vegetable gardens may sustain damage if left uncovered in these near or below freezing temperatures. Winter Storm Warnings and Winter Weather Advisories are in effect for a large portion of Maine as a coastal low spins develops with this system and spreads scattered rain and snow along its path. Surface high pressure will slide into the central U.S. from Canada and keep the cooler airmass in place. Across the West, much warmer weather is in store with summer-like temperatures. Many locations along the West Coast will have afternoon highs reaching the 80s and 90s, which may break daily max and min temperature records. Mother's Day will feature slightly less intense heat across the western third of the U.S. but still range between 10 and 20 degrees above normal. Temperatures are expected to moderate early in the coming week as a Pacific storm system approaches the coast. Sunday looks to be to be a wet across South Florida and the Keys as moisture streams along a stalled frontal boundary overhead. Thunderstorms in South Florida on Sunday could be severe and produce heavy downpours. Rain amounts across this area will average 2 to 4 inches by Monday. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php