Public Tropical Cyclone Advisory
544 WTNT34 KWNH 111500 TCPAT4 BULLETIN Post-Tropical Cyclone Isaias Advisory Number 20 NWS Weather Prediction Center College Park MD AL092026 1100 AM EDT Sun Oct 11 2026 ...FLASH FLOOD THREAT FROM ISAIAS IS DECREASING BUT SOME RISK CONTINUES TODAY ACROSS PORTIONS OF THE APPALACHIANS AND MID-ATLANTIC... SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...37.5N 84.0W ABOUT 180 MI...285 KM NE OF NASHVILLE TENNESSEE MAXIMUM SUSTAINED WINDS...25 MPH...35 KM/H PRESENT MOVEMENT...ENE OR 65 DEGREES AT 22 MPH...35 KM/H MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES WATCHES AND WARNINGS -------------------- SUMMARY OF WATCHES AND WARNINGS IN EFFECT: Flood Watches are in effect for... * Portions of the Central and Southern Appalachians Wind Advisory is in effect for... * Portions of the Central Appalachians DISCUSSION AND OUTLOOK ---------------------- At 1100 AM EDT (1500 UTC), the center of Post-Tropical Cyclone Isaias was located near latitude 37.5 North, longitude 84.0 West. The post-tropical cyclone is moving toward the east-northeast near 22 mph (35 km/h) and this motion is expected to continue today before the low dissipates over West Virginia this evening. Maximum sustained winds are near 25 mph (35 km/h) with higher gusts. Little change in strength is forecast during the next 12 hours, with the low dissipating thereafter. The estimated minimum central pressure is 1010 mb (29.83 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC. RAINFALL: Additional rainfall of 1 to 3 inches is possible today across portions of the Central Appalachians into the Mid-Atlantic, with localized flash and urban flooding possible. In western North Carolina, rainfall is diminishing, but rapid river rises and flooding remain possible today. For a complete depiction of forecast rainfall associated with Isaias, please see the National Weather Service Storm Total Rainfall Graphic available at hurricanes.gov/graphics_at4.shtml?rainqpf and the Flash Flood Risk graphic at hurricanes.gov/graphics_at4.shtml?ero. For a list of rainfall observations (and wind reports) associated with Isaias, see the companion storm summary at WBCSCCNS4 with the WMO header ACUS44 KWBC or at the following link: www.wpc.ncep.noaa.gov/discussions/nfdscc4.html. TORNADOES: A couple of tornadoes are possible today across the Piedmont and Coastal Plain of Virginia and North Carolina. SURF: Swells from Isaias will continue to affect much of the Gulf and Southeast coasts of the United States today. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. A depiction of rip current risk for the United States can be found at: hurricanes.gov/graphics_at4.shtml?ripCurrents NEXT ADVISORY ------------- This is the last public advisory issued by the Weather Prediction Center on this system.