Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 634 AM EDT Wed Jul 24 2019 Valid 12Z Wed Jul 24 2019 - 12Z Fri Jul 26 2019 ...There is a marginal risk of excessive rainfall over parts of the Southwest/Great Basin and Central/Southern Rockies... ...There is a marginal risk of excessive rainfall over parts of Northeastern Florida... ...Temperatures will be below average over parts of the Plains/Mississippi Valley into the Ohio/Tennessee Valleys and the Southern Mid-Atlantic/Southeast... A front will stall over the northeastern portion of Florida and linger through Friday. The boundary will trigger showers and thunderstorms over that parts of Florida in its vicinity. Cool high pressure will dominate the central and eastern portions of the country in the wake of the front through Thursday evening. Under an upper-level trough over the eastern parts of the country and daytime heating will aid in producing instability showers over parts of the Upper Mississippi Valley/Upper Great Lakes eastward to the Lower Great Lakes on Wednesday afternoon and evening. The instability showers will move to parts of the Western Ohio Valley and the Lower Great Lakes/Northeast on Thursday afternoon and evening. A front over parts of the Northern Intermountain Region will move eastward to the Northern Plains/Upper Mississippi Valley by Friday. The boundary will aid in producing showers and thunderstorms over parts of the Northern High Plains/Central Rockies on Wednesday evening that will move eastward to the Upper Mississippi Valley/Upper Great Lakes into parts of the Central and Southern High Plains by Friday. Meanwhile, monsoonal moisture remains over parts of the Southwest and across the Southern and Central Rockies. Daytime heating will help trigger showers and thunderstorms over the region during the late afternoon and evening hours for the next couple of days. The rain could be heavy enough to result in flash flooding in Arizona and parts of the Intermountain region. Ziegenfelder/Roth Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php