Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Mon Jun 19 2017 Valid 12Z Mon Jun 19 2017 - 12Z Wed Jun 21 2017 ...There is a slight risk of severe thunderstorms from Northern Maine to the Southern Mid-Atlantic... ...Heavy rain possible from parts of the Northeast to the Southern Mid-Atlantic... ...Heavy rain possible over parts of the Central Gulf Coast... A front extending from the Northern Appalachians southwestward to the Southern Plains will move to the Northeast/Mid-Atlantic Coast southwestward across the Southeast to parts of the Southern Plains by Tuesday evening. The western U.S. will experience a period of above normal temperatures with portions of the Southwest and California testing record high temperatures. A strong ridge of high pressure will take hold in the upper atmosphere across the Southwest U.S. allowing for surface temperatures to soar well into the triple digits for the central valley of California and much of the desert Southwest. High temperatures could reach into the 110s for these areas with a few spots pushing 120.The heat will be dangerous and a large portion of the region is under heat advisories and excessive heat warnings. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php