349 FXUS01 KWBC 211813 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 213 PM EDT Sun Jun 21 2026 Valid 00Z Mon Jun 22 2026 - 00Z Wed Jun 24 2026 ...First few days of summer to bring much above average temperatures across the West Coast, Great Basin, Southwest, Rockies and along the Gulf coast and Southeast... ...Heavy rains/severe weather Sunday night/early Monday from the Lower Lakes into the Ohio Valley, into the Mid-Atlantic and Northeast later on Monday... ...Cooler than average temperatures on tap for the Northern/Central Plains, Great Lakes and into the Northeast... ...Heavy rains and severe weather possible for the Northern and Central Plains late Monday into Tuesday... The first full days of Summer 2026 will bring much above average temperatures to all of the western U.S. from the West coast, through the Great Basin, Southwest and Rockies, extending eastward across Texas, the Gulf Coast, Southeast and Florida. The hottest temperatures over 100 degrees expected from West and Southwest Texas, into the Southwest and interior California Valleys, while low to mid 90s expected elsewhere across the above mentioned regions. Heat advisories are currently in effect across the Pacific Northwest and Southern Plains, affecting over 19 million people. In contrast, cooler than average temperatures are expected to stretch across the Northern and Central Plains, Great Lakes and into the Northeast over the next few days. The very active weather Sunday afternoon over the Upper Mississippi Valley/Mid-West region will be pushing eastward across the Lower Lakes and Ohio Valley Sunday night/early Monday and into the Mid-Atlantic and Northeast later Monday. An area of low pressure and accompanying area of much above average moisture values will support heavy rains and the risk of flash flooding with this system with the greatest risks of flash flooding today into Sunday night from the Lower Missouri Valley to Lower Ohio Valley and then across the urban corridor from Washington D.C. to New York City Monday afternoon and Monday evening. Flood watches are currently in effect from the Lower Missouri Valley region into the Lower Ohio Valley region, affecting nearly 12 million people. The trailing cold front from this area of low pressure will also produce the potential for active thunderstorms, heavy rains and severe weather from the Lower Tennessee Valley, Lower Mississippi Valley and into portions of the Southern Plains Sunday night into Monday. Additional heavy rains and the potential for severe weather possible late Monday into Tuesday across the Northern and Central Plains in association with the next strong system, in the current very active pattern across the mid section of the nation, to move into the Northern to Central Plains. Oravec Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$