Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 340 PM EDT Thu May 06 2021 Valid 00Z Fri May 07 2021 - 00Z Sun May 09 2021 ...Unsettled weather will shift into the Northern High Plains by Friday... ...Scattered showers and thunderstorms found across the Lower Great Lakes, Ohio Valley, and Mid-Atlantic through the beginning of the weekend... ...Warm temperatures in the West will spread into the Rockies and High Plains on Friday as cooler temperatures remain throughout the East... A lingering cold across Florida will be the focus for scattered shower and thunderstorm activity through late Thursday/early Friday morning before pushing offshore. A separate low pressure system tracking through the Ohio and Tennessee Valleys will produce showers and thunderstorms and the Storm Prediction Center has a Slight Risk area near the Missouri Boot Hill and western Kentucky/Tennessee. This same system is expected to reach the Mid-Atlantic region Friday, ushering in additional rain and isolated thunderstorms. Cooler temperatures will arrive to much of the eastern U.S. once the front passes through- daily maximums will largely be in the 50s and 60s from the Great Lakes, Ohio Valley to the Mid-Atlantic and Northeast. This equates to temperatures around 10 to 20 degrees below average. Across the western U.S. a cold front will advance inland toward the Great Basin tonight, spreading light rain and higher elevation snow along its path. Precipitation is then forecast to reach the Northern Rockies and Northern High Plains by Friday while an upper-level low drops southeastward into the region. As colder air aloft filters into the Northern Rockies, snow could potentially mix into the lower elevations of western Montana on Friday night. Much of the Desert Southwest and Central Great Basin will persist in being warmer and drier through the weekend. Well-above seasonal average temperatures are expected, with a few locations possibly reaching triple digits. Above average temperatures will also be felt throughout much of the central and southern Rockies/High Plains as well. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php