Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 408 AM EDT Fri Jun 11 2021 Valid 12Z Fri Jun 11 2021 - 12Z Sun Jun 13 2021 ...A Moderate Risk of excessive rainfall is in place for parts of the Central Appalachians/Mid-Atlantic region through tonight... ...Hot temperatures are likely for the Southern High Plains, and heat begins building into parts of the West this weekend... A slow-moving frontal boundary will help to focus moisture across the Central Appalachians and into southern/central parts of the Mid-Atlantic today and tonight, causing widespread showers and thunderstorms. As storms could be slow-moving and portions of the region have seen very heavy rain over the past day or two, numerous flash floods are likely, and a Moderate Risk of excessive rainfall is in place. Storm chances are likely to lessen there by Saturday as the front drops southward. A cold front shifting from the Northern/Central Plains into the Midwest will also trigger showers and thunderstorms along it over the next couple of days. Storms should weaken in the north-central U.S. early this morning as they track eastward, but a Slight Risk of severe thunderstorms is in place across mainly eastern Kansas today for damaging wind and hail threats, and isolated flash floods are possible as well. Also, scattered thunderstorms are possible in the Southeast, where a Slight Risk of excessive rainfall is delineated today and tonight. Scattered thunderstorms remain possible across much the eastern third of the country for the weekend, but without much widespread heavy rain. Meanwhile, rain chances continue in the Pacific Northwest. An upper-level ridge will help cause hot weather for the Southwest and Southern High Plains in particular today, where temperatures will be well into the 100s and Heat Advisories are in effect. Another warm day is forecast for the Midwest as well, with temperatures rising into the 90s. Meanwhile, the West and East Coasts should generally be below average for highs today. Beginning this weekend, the ridge is forecast to start building northward, allowing the Intermountain West and Rockies toward the Northern Plains to see much above average temperatures, a pattern that is expected to continue into next week. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php