ZCZC NFDTCPAT4 ALL TTAA00 KWNH DDHHMM BULLETIN Tropical Depression Ida Advisory Number 21 NWS Weather Prediction Center College Park MD AL092021 400 AM CDT Tue Aug 31 2021 ...TROPICAL DEPRESSION IDA WAS OVER NORTHERN MISSISSIPPI.. ...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 400 AM CDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...34.1N 88.9W ABOUT 145 MI...235 KM NNE OF JACKSON MISSISSIPPI ABOUT 185 MI...300 KM SW OF NASHVILLE TENNESSEE MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H PRESENT MOVEMENT...NE OR 55 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...998 MB...29.47 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 400 AM CDT (0900 UTC), the center of Tropical Depression Ida was located near latitude 34.1 North, longitude 88.9 West. The depression is moving toward the northeast near 12 mph (19 km/h), and Ida is expected to continue gradually accelerating to the northeast over the next couple 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 998 mb (29.47 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Tropical Depression Ida will track across the Middle Tennessee Valley, Lower Ohio Valley, and northern Mid-Atlantic through Thursday, producing 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, and is most likely from northern West Virginia and western Maryland into southern Pennsylvania. Widespread minor to isolated major riverine flooding is occurring or forecast from the Lower Mississippi Valley into far western Alabama, Allegheny Mountains, and Mid-Atlantic. 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 few tornadoes will be centered today across eastern Alabama, western Georgia, and the Florida Panhandle. On Wednesday, the threat will shift into portions of the Mid Atlantic. NEXT ADVISORY ------------- Next complete advisory at 1000 AM CDT. $$ Forecaster Lamers FORECAST POSITIONS AND MAX WINDS INIT 31/0900Z 34.1N 88.9W 25 KT 30 MPH...INLAND 12H 31/1800Z 35.0N 87.5W 20 KT 25 MPH...INLAND 24H 01/0600Z 36.3N 84.8W 20 KT 25 MPH...INLAND 36H 01/1800Z 37.7N 81.3W 20 KT 25 MPH...INLAND 48H 02/0600Z 38.8N 77.6W 25 KT 30 MPH...POST-TROP/INLAND 60H 02/1800Z 39.5N 74.6W 30 KT 35 MPH...POST-TROP/EXTRATROP 72H 03/0600Z 40.4N 70.4W 35 KT 40 MPH...POST-TROP/EXTRATROP NNNN