Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Sat Jul 21 2018 Valid 00Z Sun Jul 22 2018 - 00Z Tue Jul 24 2018 ...Slight risk of severe weather and flash flooding possible across the Southeast U.S.... ...Excessive rain and flash flooding possible across portions of the Ohio Valley today as well as along the mid and northern Atlantic Coast through Sunday... ...Severe weather possible across the northern High Plains and portions of Wisconsin through the rest of the weekend... ...Above normal temperatures to continue across much of the south-central and south-west United States, as well as across portions of the Northwest... The frontal system that has been impacting the Mississippi, Tennessee and Ohio Valleys will continue to push southeastward through the rest of the weekend. Showers and thunderstorms will continue along this front aided by copious amounts of moisture and instability. The Storm Prediction Center has indicated that severe weather will be a concern especially in the Southeast and the southern Appalachians through tonight. The threat for severe weather will then continue into Sunday across northern Florida and portions of southern Mississippi and Alabama. The low pressure system that has spawned this activity will remain parked across the Ohio Valley through Monday, leading to the continued chance of showers and thunderstorms across the Ohio Valley, Mid-Atlantic, and Southeast during this time. Meanwhile, a surface low that has formed off the coast of the Carolinas will also be pushing northward along the Mid-Atlantic coast and towards the Northeast through tonight. This system will be a focal point for heavy rainfall, particularly along the coastal regions. Thus, the Weather Prediction Center has issued a slight risk of excessive rainfall/flash flooding for coastal regions of the mid-Atlantic through tonight and for coastal regions of the Northeast for Sunday. A frontal system will slide across the northern High Plains through Sunday, producing a line of showers and thunderstorms as it traverses eastward. A slight risk of severe weather and excessive rainfall is possible, especially in eastern Montana/Wyoming and western portions of the Dakotas through tonight. The slight risk of severe weather then shifts eastward into the eastern Northern Plains and portions of Minnesota for Sunday. A marginal risk of flooding will also be possible for Colorado where some thunderstorms could produce flash flooding in favorable terrain. Dangerous heat remains in place across the Southern Plains, Lower Mississippi Valley, Southwest, California, and even into the western Northern Plains. This heat is expected to remain in place through at least Monday. Excessive heat watches, warnings and heat advisories are in place across these regions. High temperatures will reach well over the century mark across Texas and Oklahoma through this weekend--with areas near the Dallas/Fort Worth region reaching up to 110 degrees! Portions of the Red River Valley could have heat index values even hotter, in excess of 110 degrees. Portions of the Pacific Northwest will also continue to experience above normal temperatures--especially by the end of the weekend where temperatures could reach the mid to upper 90s and even reach over 100 in some areas. Wix Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php