Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 313 AM EDT Wed Jul 14 2021 Valid 12Z Wed Jul 14 2021 - 12Z Fri Jul 16 2021 ...Heavy rain and potential flooding for parts of the Central U.S. and the Desert Southwest... ...Heat wave across the western U.S. abates in intensity through the end of the week... The active summertime pattern of mainly afternoon/evening intense thunderstorms with heavy downpours will continue to make weather headlines through the middle of the week. This especially holds true for portions of the Upper Midwest, Central Plains, the Desert Southwest, and the Florida Peninsula. A slow moving frontal boundary will meander across Kansas and Nebraska, and extending northeastward to the northern Great Lakes, and this in combination with multiple mid-upper level impulses will fuel additional rounds of storms with high rainfall rates, and any storms that develop will have the potential to produce severe weather and flash flooding. Afternoon and evening showers and storms are expected to be in place across the Four Corners region each day, and especially southern Arizona and western New Mexico, as the southwest monsoon advects deeper moisture into this region. Given relatively weak steering flow aloft, many of these storms will likely be slow moving and result in flash flooding for canyons, across burn scars, and other vulnerable areas. A Slight Risk for excessive rainfall is in effect for parts of this region. In the temperature department, the ongoing heat wave across much of the western U.S. is abating across the Southwest as monsoonal moisture increases, but noteworthy positive anomalies will still exist across inland portions of the Pacific Northwest and Great Basin through Thursday. Overnight low temperatures are expected to be above normal as well and across a greater portion of the western U.S. compared to the daytime highs. Hot and humid conditions will also be present across much of the Eastern U.S. through the end of the week before cooler weather arrives in time for the weekend. Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php