Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 PM EDT Tue Aug 06 2019 Valid 00Z Wed Aug 07 2019 - 00Z Fri Aug 09 2019 ...Severe thunderstorms possible from portions of the Northern Plains to the Upper Midwest through Wednesday... ...Monsoon thunderstorms with possible flash flooding across portions of the Southwest today and Wednesday... ...Heavy rainfall / flash flooding expected for portions of eastern Kansas into western Missouri beginning late Wednesday... ...Much above normal temperatures likely across portions of the Northwest... A cold front currently moving through the Great Lakes and Ohio Valley will help contribute to the development of afternoon and evening thunderstorms through Wednesday as it moves east. While there will be some relief from heat and humidity behind the front on Wednesday, by the time it reaches the East Coast, it will be rather weak allowing high temperatures to remain near to slightly above average along the Eastern Seaboard. Some of the stronger thunderstorms will have the potential to produce severe weather and flash flooding, mainly from the Ohio Valley to the Mid-Atlantic region into southern New England. A second and much stronger cold front will move through the north-central U.S. tonight, reaching the Great Lakes early Thursday morning. Severe weather will be possible out ahead of the boundary within a hot and humid air mass. The Storm Prediction Center has an Enhanced Risk of severe storms this evening and overnight over eastern South Dakota into far northeastern Nebraska. The threat will continue for Wednesday ahead of the front with an expected focus for heavy rain and possible flash flooding from eastern Kansas into western Missouri beginning Wednesday night. Storms are expected to diminish in coverage during the day on Thursday but a second round of heavy rain will be possible late Thursday, some of which may overlap with Wednesday night's heavy rain with potential for a multi-day rainfall total of several inches toward the end of the work week from eastern Kansas into western Missouri. Across the Southwest, monsoonal moisture will remain in place this week bringing daily chances for scattered flash flooding from diurnally driven thunderstorms. The main focus will be from eastern Arizona into New Mexico and southern Colorado. Meanwhile across the West, heat will remain a concern given high temperatures from the upper 90s to low 100s forecast today from eastern Washington into the Great Basin. Similar temperatures are expected for eastern Washington/Oregon on Wednesday but a gradual cooling trend is anticipated west of the Rockies through the end of the week as an upper level low slides east from the eastern Pacific. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php