Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 331 PM EDT Mon Aug 12 2024 Valid 00Z Tue Aug 13 2024 - 00Z Thu Aug 15 2024 ...Heavy rain and flash flooding threat across portions of the Central Plains into the Lower Missouri Valley... ...Heat continues across the southern U.S. from the Southern Plains, the Gulf coast and into the Southeast and Florida... ...Below average temperatures across the West and portions of the central and eastern U.S... ...A continued fire weather threat and poor air quality for portions of the Pacific Northwest, Northern Rockies and Great Basin... A slow moving frontal boundary stretching northwest to southeast across the Northern-Central Plains into the Lower Mississippi Valley will continue be the focus for active showers and thunderstorms over the next few days. The next round of heavy rains to the east of this front expected to form late Monday night into early Tuesday over the Central High Plains across eastern Colorado and then push eastward early Tuesday through Kansas and into western Missouri. This will be followed by yet another area of potentially heavy rains Tuesday night into early Wednesday from northeast Colorado, southern Nebraska into much of Missouri. With the potential for more than one round of heavy rains to move across the same regions, flash and river flooding will be possible from eastern Colorado, across portions of Kansas and into Missouri. In the regions of active thunderstorms over the next few days, temperatures are expected to remain below average. Below average temperatures and lower humidities will continue for the next two days across portions of the East from the southern Mid-Atlantic into New England. Above average temperatures to continue across the southern tier of the nation from the Southern Plains, east across the Gulf Coast, Southeast and Florida. While there is not expected to be many record highs across these regions over the next two days, the hot temperatures and high levels of humidity are resulting in heat advisories across much of these regions, affecting nearly 37 million people. Below average temperatures also on tap over the next few days for most areas from the Rockies to the West Coast. Monsoonal showers and thunderstorms possible from the Desert Southwest into the Rockies with locally heavy rains and isolated flash flooding. Dry weather expected along the West coast from California into the Pacific Northwest and the Great Basin. This will continue the ongoing fire weather threat across these areas, along with poor air quality from ongoing wild fires. Oravec Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php