FXUS01 KWBC 121919 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 318 PM EDT Thu Jun 12 2025 Valid 00Z Fri Jun 13 2025 - 00Z Sun Jun 15 2025 ...Heavy rain and instances of flash flooding possible across parts of the Lower Mississippi Valley and Upper Midwest over the next few days... ...Severe weather potential most likely across the High Plains through early this weekend... ...Above average warmth continues across the Intermountain West, Southwest, and High Plains... Mid-June weather pattern remains underway through early this weekend and is expected to feature a large part of the central and eastern U.S. under the potential for scattered thunderstorms, a few of which could contain intense rainfall rates, damaging wind gusts, and hail. A single frontal boundary stretching from the northern Mid-Atlantic by Friday morning across the Midwest and into the northern High Plains will be the dividing line between warm/humid to the south and cooler to the north. Along this frontal boundary, numerous thunderstorms developing tonight and lingering through Friday could create isolated to scattered instances of flash flooding from the eastern Dakotas through central Minnesota. Further south, more widely scattered thunderstorms are likely over the next several days within the sultry summertime airmass stretching from the southern Plains through the Southeast. More organized areas of thunderstorms are possible tonight through Friday across the Lower Mississippi Valley towards the western Gulf Coast. This follows extreme rainfall amounts that occurred previously throughout parts of southeastern Texas last night into early Thursday morning. Another focus for unsettled weather on Friday and Saturday will be across the Mid-Atlantic, where the lingering frontal boundary could become a focus for persistent thunderstorm chances. While isolated damaging wind gusts and hail is possible associated with these scattered storms in the central and eastern U.S., the greatest potential for severe weather is forecast across the High Plains as storms develop each afternoon and strengthen. The temperature outlook in the short range time period (valid ending Sunday morning) contains above average warmth across much of the Intermountain West, High Plains, and Southwest as upper ridging remains in place next to troughing over the Pacific Northwest. Widespread highs into the 90s are anticipated, with triple digits across the Desert Southwest extending from southeast California to southern New Mexico. Extreme Heat Watches are in effect beginning on Saturday for southern Arizona and parts of the interior southern California Desert due to the potential for maximum temperatures to reach 114 degrees. Meanwhile, much cooler temperatures will be confined to the northern Plains, Upper Midwest, Great Lakes, and New England to the north of the aforementioned frontal boundary. High temperatures here will struggle to reach higher than the 60s. Snell Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$