ZCZC NFDTCPAT4 ALL TTAA00 KWNH DDHHMM BULLETIN Tropical Depression Ida Advisory Number 24 NWS Weather Prediction Center College Park MD AL092021 1100 PM EDT Tue Aug 31 2021 ...TROPICAL DEPRESSION IDA IS MOVING ACROSS MIDDLE TENNESSEE... ...WIDESPREAD HEAVY RAIN AND AREAS OF POTENTIALLY LIFE THREATENING FLASH FLOODING ARE POSSIBLE BEGINNING WEDNESDAY ACROSS PORTIONS OF THE MID ATLANTIC INTO SOUTHERN NEW YORK AND SOUTHERN NEW ENGLAND... ...REMNANTS OF IDA WILL ALSO BRING AN ENHANCED RISK FOR SEVERAL TORNADOES ACROSS PARTS OF THE MID-ATLANTIC ON WEDNESDAY... SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...36.2N 84.6W ABOUT 160 MI...260 KM NE OF HUNTSVILLE ALABAMA ABOUT 45 MI...70 KM NW OF KNOXVILLE TENNESSEE MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H PRESENT MOVEMENT...ENE OR 60 DEGREES AT 20 MPH...31 KM/H MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES WATCHES AND WARNINGS -------------------- Flood and Flash Flood Watches extend across the eastern Tennessee and Ohio Valleys, southern and central Appalachians, the northern Mid-Atlantic region, and into southern New York and southern New England. A tornado watch is in effect until 3 am EDT Wednesday across extreme north-central North Carolina into western and central Virginia. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM EDT (0300 UTC), the center of Tropical Depression Ida was located near latitude 36.2 North, longitude 84.6 West. The depression is moving toward the east-northeast near 20 mph (31 km/h) and this motion is expected to gradually accelerate through Wednesday. Maximum sustained winds are near 30 mph (45 km/h) with higher gusts. Some strengthening is forecast during the next 48 hours as Ida becomes extratropical and moves offshore on Thursday. The estimated minimum central pressure is 1000 mb (29.53 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: 3 to 6 inches with isolated higher amounts through Wednesday morning. Mid Atlantic to Southern New England: 3 to 8 inches with isolated higher amounts, Wednesday into Thursday. Considerable flash flooding is possible from the Middle Tennessee Valley, Ohio Valley, Central and Southern Appalachians. Significant and life-threatening flash flooding is possible from the Mid-Atlantic into southern New England, especially across highly urbanized metropolitan areas and areas of steep terrain. Widespread moderate and major river flooding impacts are forecast from northern West Virginia and western Maryland into southern Pennsylvania and New Jersey, particularly in the Monongahela, Potomac, Susquehanna, Delaware, and lower Hudson river basins. 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 an isolated tornado will continue tonight across portions of the Mid Atlantic overnight. On Wednesday, several tornadoes are probable across portions of the Mid Atlantic, mainly during the afternoon and evening hours. NEXT ADVISORY ------------- Next complete advisory at 500 AM EDT. $$ Forecaster Hurley FORECAST POSITIONS AND MAX WINDS INIT 01/0300Z 36.2N 84.6W 25 KT 30 MPH...INLAND 12H 01/1200Z 37.5N 81.7W 25 KT 30 MPH...INLAND 24H 02/0000Z 39.6N 76.6W 30 KT 35 MPH...INLAND 36H 02/1200Z 42.1N 71.1W 35 KT 40 MPH...POST-TROP/EXTRATROP 48H 03/0000Z 44.7N 65.7W 35 KT 40 MPH...POST-TROP/EXTRATROP NNNN
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