Isaias, advisory 17
Post-Tropical Cyclone Isaias Advisory Number 17
Public advisory
KWNH · public advisory 17 · issued Oct 10, 8:37 PM UTCsource ↗
000 WTNT34 KWNH 102037 TCPAT4 BULLETIN Post-Tropical Cyclone Isaias Advisory Number 17 NWS Weather Prediction Center College Park MD AL092026 400 PM CDT Sat Oct 10 2026 ...FLASH FLOODING RISK CONTINUES WITH ISAIAS AS IT MOVES THROUGH THE SOUTHEAST UNITED STATES... SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...33.5N 86.9W ABOUT 5 MI...10 KM W OF BIRMINGHAM ALABAMA ABOUT 180 MI...290 KM S OF NASHVILLE TENNESSEE MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H PRESENT MOVEMENT...NNE OR 25 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES WATCHES AND WARNINGS -------------------- SUMMARY OF WATCHES AND WARNINGS IN EFFECT: Flood Watches are in effect for... * Portions of the Southeast United States * Southern Appalachians High Wind Warning is in effect for... * Portions of the Southern Appalachians Wind Advisory is in effect for... * Portions of the Mid-South and Southern Appalachians DISCUSSION AND OUTLOOK ---------------------- At 400 PM CDT (2100 UTC), the center of Post-Tropical Cyclone Isaias was located near latitude 33.5 North, longitude 86.9 West. The post-tropical cyclone is moving toward the north-northeast near 15 mph (24 km/h) and this motion is expected to become more northeasterly and accelerate by Sunday. Maximum sustained winds are near 30 mph (45 km/h) with higher gusts. Little change in strength is forecast during the next 48 hours. The estimated minimum central pressure is 1007 mb (29.74 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: Rainfall totals of 3 to 6 inches with localized maximum amounts of 10 inches are possible across the Southern Appalachians from northeast Georgia into the western Carolinas and from the upper coast of South Carolina into eastern North Carolina. Additional rainfall totals of 1 to 2 inches possible across the remainder of the Southeast into northern Florida. Flash, urban, and river flooding is possible across the region, with considerable impacts, including landslides, possible across the southern Appalachians. Significant river flooding across the western Florida Panhandle will crest today through Sunday. 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. TORNADOES: A couple of tornadoes are possible today across eastern Georgia and the Carolinas. WIND: Strong wind gusts continue to pose a threat across the southeastern United States today, particularly near the Southern Appalachians. Scattered power outages and downed trees and powerlines may occur, with the risk highest in elevated terrain. SURF: Swells from Isaias will continue to affect much of the Gulf coasts of the United States, Mexico, and western Cuba this weekend. 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 ------------- Next complete advisory at 1000 PM CDT. $$ Forecaster Roth
Forecast discussion
KWNH · forecast discussion 17 · issued Oct 10, 8:38 PM UTCsource ↗
000 WTNT44 KWNH 102038 TCDAT4 Post-Tropical Cyclone Isaias Discussion Number 17 NWS Weather Prediction Center College Park MD AL092026 400 PM CDT Sat Oct 10 2026 Key Messages: 1. Heavy rainfall associated with Post-Tropical Cyclone Isaias will continue across the Southern Appalachians and Southeast today. Considerable flash and urban flooding will be possible. Landslides are also possible across the Southern Appalachians. 2. Strong wind gusts continue to pose a threat across the southeastern United States today, particularly near the southern Appalachians. Scattered power outages and downed trees and powerlines may occur, with the risk highest in elevated terrain. 3. Swells from Isaias will continue to affect much of the Gulf coasts of the United States, Mexico, and western Cuba this weekend. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. 4. A couple of tornadoes are possible today across eastern Georgia and the Carolinas. FORECAST POSITIONS AND MAX WINDS INIT 10/2100Z 33.5N 86.9W 25 KT 30 MPH...POST-TROPICAL 12H 11/0600Z 35.2N 86.0W 25 KT 30 MPH...POST-TROP/INLAND 24H 11/1800Z 37.9N 81.9W 25 KT 30 MPH...POST-TROP/INLAND 36H 12/0600Z...DISSIPATED $$ Forecaster Roth
