006 FXUS01 KWBC 012037 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 435 PM EDT Tue Sep 01 2026 Valid 00Z Wed Sep 02 2026 - 00Z Fri Sep 04 2026 ...Tropical Storm Edouard has made landfall near the Louisiana-Texas coastal border, bringing tropical storm conditions near the coast and flash flooding threat further inland across eastern Texas... ...Excessive rainfall and severe weather threats slowly progress southward across the lower Great Lakes and northern Mid-Atlantic during the next couple of days... ...Cool and unsettled weather moving into the Pacific Northwest as next surge of monsoonal moisture reaches Arizona and New Mexico on Thursday... ...Heat advisories in effect for a large portion of the east-central U.S., Deep South, and portions of the Mid-Atlantic; excessive heat warning across the mid-Mississippi Valley... September begins with late-summer heat continuing to expand from the central U.S toward the eastern U.S. as Tropical Storm Edouard makes landfall near the Louisiana-Texas coastal border Tuesday afternoon. Edouard is forecast to move northwestward into eastern Texas and weaken quickly to a post-tropical low pressure area by Wednesday morning. Tropical storm conditions near the coast where Edouard makes landfall will quickly transition to a heavy rainfall threat along Edouard's path. A narrow corridor of heavy rainfall totals of 3 to 6 inches can be expected with maximum totals up to 9 inches for parts of the upper Texas Coast inland through east-central Texas, and potential for 2 to 4 inches in far southwest Louisiana. Flash flooding is likely along this corridor, especially in low-lying and urban areas. River flooding may also be possible. Meanwhile, a low-pressure system across southern Canada continues to push a frontal system eastward through the Great Lakes. A stationary front extending southeast from the low center has set up a corridor across the lower Great Lakes to the northern Mid-Atlantic where repeated rounds of showers and embedded thunderstorms will pose heavy rain and severe weather threats through the next couple of days. These threats will progress very gradually southward into the Mid-Atlantic by Thursday. Across the north-central Plains, additional rounds of thunderstorms are also expected to develop near a meandering front and a wave of low pressure. These showers and storms are expected to move from west to east toward the upper Midwest through the next couple of days, with a severe thunderstorm threat across northern-central Montana on Wednesday. A rather deep upper-level trough/low for late summer is forecast to push inland into the Pacific Northwest, bringing increasingly widespread unsettled weather deeper into the Intermountain West over the next couple of days. In fact, below freezing temperatures are possible across the higher elevations of southern Oregon by Thursday morning. A couple inches of rain with locally higher amounts can be expected along the coastal ranges with lower amounts for the lower elevations. Meanwhile, the influx of the upper trough will begin to pull the next surge of monsoonal moisture from Mexico further into Arizona and New Mexico by Thursday. WPC has posted a slight risk of excessive rainfall for southern Arizona on Thursday. In contrast to the cool weather forecast for the Pacific Northwest, late-summer heat reaching into the lower 100s will persist across the central Plains. The heat is forecast to spread farther eastward into the eastern U.S. over the next couple of days with highs reaching well up into the 90s to around 100 for the interior Mid-Atlantic by Wednesday afternoon. Heat advisories are currently in effect for a large portion of the east-central U.S. to the Deep South with new heat advisories posted for portions of the Mid-Atlantic. Excessive heat warnings are in effect for the mid-Mississippi Valley where heat indices could reach 110 during the day. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php Extreme Heat Key Messages available at: https://www.wpc.ncep.noaa.gov/key_messages/LatestKeyMessage_1.png $$