ZCZC NFDTCPAT4 ALL TTAA00 KWNH DDHHMM BULLETIN Tropical Depression Ida Advisory Number 20 NWS Weather Prediction Center College Park MD AL092021 1000 PM CDT Mon Aug 30 2021 ...TROPICAL DEPRESSION IDA WAS OVER CENTRAL MISSISSIPPI.. ...HEAVY RAIN AND FLOOD THREAT WILL CONTINUE TO SPREAD ACROSS PARTS OF THE TENNESSEE AND OHIO VALLEY OVERNIGHT INTO TUESDAY... SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...33.3N 89.5W ABOUT 80 MI...130 KM NNE OF JACKSON MISSISSIPPI MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...NE OR 50 DEGREES AT 10 MPH...17 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 northern Mid-Atlantic and southern New England. DISCUSSION AND OUTLOOK ---------------------- At 1000 PM CDT (0300 UTC), the center of Tropical Depression Ida was located near latitude 33.3 North, longitude 89.5 West. The depression is moving toward the northeast near 10 mph (17 km/h) and this motion is expected to continue overnight. Maximum sustained winds are near 35 mph (55 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: Through Tuesday morning across portions of southeast Louisiana into far southern Mississippi, Ida will produce additional rainfall totals of 2 to 4 inches with localized higher amounts possible. Storm total rainfall accumulations of 10 to 18 inches with isolated maximum amounts of 24 inches is expected. Heavy rain combined with storm surge has resulted in catastrophic impacts along the southeast coast of Louisiana with considerable flash flooding and riverine flooding continuing farther inland. Ida will continue to turn northeast tonight and is forecast to track across the Middle Tennessee Valley, Ohio Valley and Mid-Atlantic through Wednesday, producing the following rainfall totals: Coastal Alabama to the far western Florida panhandle: An additional 3 to 6 inches resulting in storm total accumulations of 6 to 12 inches with isolated maximum amounts of 15 inches, today through Tuesday morning. Northern Mississippi, Middle Tennessee Valley, Ohio Valley, Central/Southern Appalachians into the Mid-Atlantic: 3 to 6 inches with isolated higher amounts, Tuesday into Wednesday. Southern New England: 2 to 4 inches with isolated higher amounts, Wednesday into Thursday. Considerable flash flooding is possible from the Lower Mississippi Valley through the Middle Tennessee Valley, Ohio Valley, Central/Southern Appalachians, and into the Mid-Atlantic. Widespread minor to isolated major riverine 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: A few tornadoes are possible through tonight, mainly across far southeast Mississippi, the southern half of Alabama, and the western Florida Panhandle. The threat for a few tornadoes will shift east on Tuesday and become centered across eastern Alabama, western Georgia, and the Florida Panhandle. NEXT ADVISORY ------------- Next complete advisory at 400 AM CDT. $$ Forecaster Bann FORECAST POSITIONS AND MAX WINDS INIT 31/0300Z 33.3N 89.5W 30 KT 35 MPH...INLAND 12H 31/1200Z 34.2N 88.4W 25 KT 30 MPH...INLAND 24H 01/0000Z 35.7N 85.7W 25 KT 30 MPH...INLAND 36H 01/1200Z 37.0N 82.8W 25 KT 30 MPH...INLAND 48H 02/0000Z 38.0N 79.7W 25 KT 30 MPH...POST-TROP/INLAND 60H 02/1200Z 39.0N 75.9W 30 KT 35 MPH...POST-TROP/EXTRATROP 72H 03/0000Z 39.6N 72.2W 30 KT 35 MPH...POST-TROP/EXTRATROP NNNN