000 WTNT34 KNHC 302037 TCPAT4  BULLETIN Tropical Depression Ida Advisory Number  19 NWS National Hurricane Center Miami FL       AL092021 400 PM CDT Mon Aug 30 2021  ...IDA BECOMES A TROPICAL DEPRESSION OVER MISSISSIPPI... ...HEAVY RAINFALL AND FLASH FLOODING THREAT CONTINUES TO SPREAD  INLAND...   SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...32.6N 90.3W ABOUT 20 MI...35 KM NNW OF JACKSON MISSISSIPPI MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...NNE OR 20 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES   WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY:  All Tropical Storm and Storm Surge Warnings have been discontinued.  SUMMARY OF WATCHES AND WARNINGS IN EFFECT:  There are no coastal watches and warnings in effect.   DISCUSSION AND OUTLOOK ---------------------- At 400 PM CDT (2100 UTC), the center of Tropical Depression Ida was located near latitude 32.6 North, longitude 90.3 West. The depression is moving toward the north-northeast near 9 mph (15  km/h).  A faster northeastward motion is expected tonight through  Wednesday.  On the forecast track, the center of Ida will move  farther inland over central and northeastern Mississippi tonight.  Ida is then forecast to move across the Tennessee Valley on  Tuesday and near the central Appalachians on Wednesday.  Maximum sustained winds have decreased to near 35 mph (55 km/h)  with higher gusts. Additional weakening is forecast during the  next day or so.   The minimum central pressure estimated from surface observations is  999 mb (29.50 inches).   HAZARDS AFFECTING LAND ---------------------- Key messages for Ida can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at hurricanes.gov/graphics_at4.shtml?key_messages.  STORM SURGE:  Water levels along the northern Gulf coast should continue to subside through this evening.  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 this evening 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.   Central Mississippi into far western Alabama: 4 to 8 inches with  isolated maximum amounts of 12 inches, today through tonight.   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.  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.   SURF:  Swells will continue to affect portions of the northern Gulf coast through this evening.  These swells are likely to cause life- threatening surf and rip current conditions. Please consult products from your local weather office.   NEXT ADVISORY ------------- This is the last public advisory issued by the National Hurricane  Center on Ida.  Future information on Ida can be found in Public  Advisories issued by the Weather Prediction Center beginning at 10  PM CDT, under AWIPS header TCPAT4, WMO header WTNT34 KWNH, and on  the web at http://www.wpc.ncep.noaa.gov.   $$ Forecaster Brown