Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 312 PM EDT Thu Aug 01 2019 Valid 00Z Fri Aug 02 2019 - 00Z Sun Aug 04 2019 ...Heavy rainfall and a flash flooding threat will continue over the next few days across eastern portions of the central Great Plains into the lower Missouri and Mississippi valleys... ...Monsoonal moisture will bring additional showers and thunderstorms across the Southwest and the southern to central Rockies... ...Widespread scattered showers and thunderstorm will stretch from the Gulf Coast into the Mid-Atlantic in the vicinity of a stationary front... ...Increasing tropical moisture will bring a heavy rain threat across much of the Florida peninsula... Over the next few days, a series of upper level disturbances are forecast to track southeast across the central Plains into the lower Missouri valley and then south into the lower Mississippi valley. These systems are expected to interact with increasing moisture along a slow moving frontal boundary -- supporting showers and thunderstorms, with heavy rainfall amounts possible. For Thursday evening into early Friday, heaviest amounts are expected to focus from southeastern Nebraska into eastern Kansas along the Missouri border. Additional heavy rains are possible across eastern Kansas during the day on Friday, dropping father south into northeastern Oklahoma and northwestern Arkansas by the evening and overnight hours. These heavy rains may produce flash flooding, with WPC highlighting the region with a Moderate Risk for flash flooding through early Saturday. Widespread cloud cover will limit daytime temperatures -- with Friday and Saturday high temperatures expected to be as much 10 to 15 degrees below average. The persistent upper level ridge centered over the southern Rockies/High Plains region will continue to transport above average levels of monsoonal moisture from the Southwest into portions of the southern to central Rockies/High Plains region. This will support additional scattered showers and thunderstorms across these regions, with locally heavy rains and an isolated flash flooding possible. A frontal boundary is expected to remain stationary from the lower Mississippi Valley into the Southern Appalachians and Mid-Atlantic. This front will remain a focus for scattered showers and thunderstorms with locally heavy rains and isolated flash flooding. A developing trough of low pressure moving across Florida into the Gulf of Mexico will be transporting tropical moisture across much of the Florida peninsula for the end of the work week. Shower and thunderstorms will become frequent across much of the Florida peninsula with locally heavy rainfall likely. Pereira/Oravec Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php