ZCZC NFDTCPAT4 ALL TTAA00 KWNH DDHHMM CCA BULLETIN Tropical Depression Ida Advisory Number 22...Corrected NWS Weather Prediction Center College Park MD AL092021 1000 AM CDT Tue Aug 31 2021 Corrected for current system status (TD) ...TROPICAL DEPRESSION IDA IS MOVING ACROSS THE TENNESSEE VALLEY... ...CONSIDERABLE HEAVY RAIN AND FLOOD THREAT WILL CONTINUE TO SPREAD FROM THE TENNESSEE AND OHIO VALLEYS INTO THE CENTRAL AND SOUTHERN APPALACHIANS AND MID ATLANTIC THROUGH WEDNESDAY... SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...35.0N 87.8W ABOUT 60 MI...95 KM WNW OF HUNTSVILLE ALABAMA ABOUT 100 MI...160 KM SW OF NASHVILLE TENNESSEE MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H PRESENT MOVEMENT...NE OR 50 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES WATCHES AND WARNINGS -------------------- Flood and Flash Flood Watches extend from the Gulf Coast Region across the Tennessee and Ohio Valleys, central and southern Appalachians, into the Mid-Atlantic and southern New England. DISCUSSION AND OUTLOOK ---------------------- At 1000 AM CDT (1500 UTC), the center of Tropical Depression Ida was located near latitude 35.0 North, longitude 87.8 West. The depression is moving toward the northeast near 15 mph (24 km/h) and this motion is expected to gradually accelerate over the next couple of days. 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 996 mb (29.42 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Tropical Depression Ida will produce the following rainfall totals: Portions of the Southeast, including the western Florida panhandle, eastern and northern Alabama, and northern Georgia: An additional 1 to 3 inches through Wednesday morning. Middle Tennessee Valley, Ohio Valley, Central and Southern Appalachians into the Mid-Atlantic: 3 to 6 inches with isolated higher amounts through Thursday morning. Southern New England: 2 to 4 inches with isolated higher amounts, Wednesday into Thursday. Considerable flash flooding is possible from the Middle Tennessee Valley, Ohio Valley, Central and Southern Appalachians, into the Mid-Atlantic and southern New England, with additional widespread moderate and isolated major river flooding impacts forecast from northern West Virginia and western Maryland into southern Pennsylvania and New Jersey. Widespread minor to isolated major river flooding is occurring or forecast from the Lower Mississippi Valley into far western Alabama. Rivers will remain elevated into next week. For the latest rainfall reports and wind gusts associated with Tropical Depression Ida, see the companion storm summary at WBCSCCNS4 with the WMO header of ACUS44 KWBC or at the following link: www.wpc.ncep.noaa.gov/discussions/nfdscc4.html TORNADOES: The threat for a couple of tornadoes will be centered this evening across eastern Alabama, western Georgia, and the Florida Panhandle. On Wednesday, the threat of a few tornadoes will shift into portions of the Mid Atlantic. NEXT ADVISORY ------------- Next complete advisory at 400 PM CDT. $$ Forecaster Churchill FORECAST POSITIONS AND MAX WINDS INIT 31/1500Z 35.0N 87.8W 25 KT 30 MPH...INLAND 12H 01/0000Z 36.0N 85.8W 25 KT 30 MPH...INLAND 24H 01/1200Z 37.4N 82.7W 20 KT 25 MPH...INLAND 36H 02/0000Z 38.6N 79.0W 20 KT 25 MPH...INLAND 48H 02/1200Z 39.7N 75.6W 25 KT 30 MPH...POST-TROP/INLAND 60H 03/0000Z 40.5N 72.0W 30 KT 35 MPH...POST-TROP/EXTRATROP 72H 03/1200Z 41.3N 68.7W 35 KT 40 MPH...POST-TROP/EXTRATROP 96H 04/1200Z...POST-TROP/EXTRATROP NNNN