Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 352 PM EDT Mon Jun 22 2020 Valid 00Z Tue Jun 23 2020 - 00Z Thu Jun 25 2020 ...Slight Risks of severe weather and flash flooding are in place over portions of the Plains and Mississippi Valley through tonight... ...Hot temperatures could set records across the Northeast and northern California... Showers and thunderstorms are expected through midweek for central and eastern parts of the U.S. as moisture streams in along and ahead of a leading frontal boundary. Through tonight, there is a Slight Risk of severe weather for much of the Southern Plains mainly for wind and hail threats, while flash flooding is expected farther east over the Lower Mississippi Valley. Portions of the Midwest could also see severe thunderstorms and flash flooding through the night. As the front pushes southeastward, a Slight Risk of flash flooding is in place on Tuesday over the Appalachians, as upslope flow could enhance rainfall totals and runoff could cause flooding issues. Meanwhile, the best potential for severe weather is forecast for the Southern High Plains, where a Slight Risk is in place near the back end of the front. Showers and thunderstorms should continue across the Eastern Seaboard back into to the Southern Plains on Wednesday. The front will also cool temperatures behind it--after a hot Monday in the Southern High Plains, with temperatures well above 100 degrees, 80s to low 90s are expected the next couple of days there. Highs of 5 to 10 degrees below normal are forecast to push into the Mississippi and Tennessee Valleys Tuesday and the Southeast Wednesday. However, temperatures will soar ahead of the front; the Northeast should see another hot day on Tuesday, with highs in the upper 80s and 90s. Record high minimum and maximum temperatures could be set there. Meanwhile, the West can also expect much above normal temperatures underneath an upper-level ridge, and Heat Advisories are in place for much of northern California and southwestern Oregon. An upper-level trough and frontal system are expected to affect the Northwest by Wednesday, cooling temperatures only slightly but leading to an increase in precipitation chances. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php