Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sun Aug 30 2020 Valid 00Z Mon Aug 31 2020 - 00Z Wed Sep 02 2020 ...Flash flooding is a periodic threat from the Southern Plains eastward toward the Mid-Atlantic over the next couple of days... ...A strong cold front could cause severe storms in the Northern/Central Plains through tonight, and bring much colder temperatures and even mixed precipitation to the Northern Rockies... ...Locally heavy rain and flash flooding are possible in the Southwest while fire weather remains a threat across the Central Great Basin... A frontal boundary is expected to continue meandering across the Southern Plains eastward across the Lower/Middle Mississippi and Tennessee Valleys toward the Carolinas through Tuesday, and will provide a focus for thunderstorms in those areas. Through tonight, heavy rainfall could cause flash flooding across portions of the Mississippi Valley into the Tennessee and Lower Ohio Valleys with these storms. Then on Monday as a low along the front lifts northeastward, parts of the Mid-Atlantic can expect moderate to heavy rain along with flash flooding to spread into the area. Additionally, across the Southern Plains to Lower Mississippi Valley, severe weather and flash flooding are both possible on Monday into Tuesday as another front approaches. Through this (Sunday) evening into tonight, thunderstorms are possible along a strong cold front moving across the Northern Plains into the Midwest, and a Slight Risk of severe weather is in place from the Storm Prediction Center. A few instances of flash flooding are also possible. Much cooler temperatures are forecast behind the front, with highs 10 to 20 degrees below normal for the Northern Rockies into the Northern/Central Plains Monday. In fact, temperatures will be sufficiently cold enough to support mixed precipitation or light snow in the higher elevations of the Northern Rockies on Monday. Meanwhile, much of Texas should remain hot tomorrow, with temperatures in the upper 90s or 100s. In the Southwest, particularly the southern half of Arizona, monsoonal moisture could lead to locally heavy rain through Monday, and a Slight Risk of flash flooding is in place through tonight. However, farther north, fire weather is a threat across portions of the Great Basin toward the Central High Plains as the front ushers in dry and windy conditions. Red Flag Warnings are widespread across those areas as well as northeastern Montana and far southwestern Oregon/far northwestern California. A Critical Risk of fire weather is forecast by the Storm Prediction Center for portions of the Central Great Basin on Monday. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php