Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Mon May 10 2021 Valid 12Z Mon May 10 2021 - 12Z Wed May 12 2021 ...Widespread rain and thunderstorms are expected across the south-central to southeastern U.S., with some severe weather and flash flooding possible... ...Late-season snowfall is likely across the Northern/Central Rockies and High Plains with much colder than average temperatures... ...Warm and dry conditions will cause fire danger in the southwestern U.S. and California... A slow-moving front is forecast to meander over the south-central and southeastern U.S. over the next few days, and the front will help to focus abundant moisture to cause widespread showers and thunderstorms across the region. Today into tonight, severe thunderstorms is most likely for portions of southern Texas as well as eastern North Carolina, where Slight Risks of severe weather are in place from the Storm Prediction Center for tornado, wind, and hail threats (southern Texas could see very large hail). Some strong to severe thunderstorms cannot be ruled out along all the Gulf Coast states as well. Additionally, heavy rain is possible and is currently forecast to focus near the central Gulf Coast, and isolated to scattered flash floods are possible there with a Slight Risk of excessive rainfall and a Flash Flood Watch. Then on Tuesday, moderate to locally heavy rainfall with thunderstorms can be expected for parts of Texas into the Lower Mississippi Valley, and another Slight Risk of excessive rainfall is in place for those areas. Meanwhile, farther north, surface lows in the vicinity of the Northeast will help cause persistent showers there, with light to moderate rainfall expected. Upper-level energy and cold temperatures will lead to snow across the Northern and Central Rockies. The highest elevations of Colorado and Wyoming can expect well over a foot of snow. Even in lower elevations of the Central High Plains, precipitation type could fluctuate and some may fall in the form of snow. Cities like Cheyenne, Wyoming could see around 6 inches of snow, and Colorado Springs could see some accumulating late-season snow too. Temperatures are expected to be below average for much of the country behind the potent cold front, especially by Tuesday. High temperatures in central parts of the High Plains are forecast to be the most anomalous, with temperatures around 30 degrees below average for this time of year. In terms of cold low temperatures, Freeze Warnings and Frost Advisories are once again in effect for portions of the Great Lakes region and Ohio Valley this morning. Exceptions that will be warmer than normal are the West Coast, especially California, as well as southern Texas and Florida, with temperatures right around normal in the Southwest. Warm temperatures and as dry and windy conditions should unfortunately once again cause Elevated to Critical Risks of fire weather and Red Flag Warnings in interior northern California and the Southwest/Southern Rockies/Southern High Plains today. Conditions should improve somewhat by Tuesday. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php