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Tropical Depression Fred Forecast Discussion Number 31
2021-08-17 10:41:06| National Hurricane Center (Atlantic)
Issued at 400 AM CDT Tue Aug 17 2021 000 WTNT41 KNHC 170840 TCDAT1 Tropical Depression Fred Discussion Number 31 NWS National Hurricane Center Miami FL AL062021 400 AM CDT Tue Aug 17 2021 Fred has moved farther inland and is now located near the border of southwestern Georgia and southeastern Alabama. Between 0400-0600 UTC, Doppler radar data from Tallahassee, Florida, still showed 68-70 kt velocities between 9,000-10,000 ft associated with a solid band of convection in the northeastern quadrant. Using 50 percent of those values supported keeping Fred as a 35-kt tropical storm at 0600 UTC. This intensity was also supported by 30-kt winds on the west side of the low-level circulation noted in surface observations. Since that time, however, the solid band of convection has become fragmented and the thunderstorm activity has broken up into more discrete cells. Satellite and radar imagery also indicate that the mid- and upper-level circulations have decoupled and sheared out to the north of the low-level circulation. As a result, Fred has been downgraded to a tropical depression at the 0900 UTC advisory time. Weakening will continue through today as Fred moves farther inland over Georgia and into the southern Appalachians, with Fred likely becoming a remnant low later tonight before merging with a frontal system over the northern Appalachians on Wednesday. Fred has continued to move north-northeastward, or 015/12 kt. For the remainder of today, Fred should maintain a motion toward the north-northeast or northeast accompanied by a gradual increase forward speed owing to a very stable steering pattern between a deep-layer ridge to the east and a broad mid-tropospheric trough to the west. The new NHC track forecast is essentially just an update of the previous advisory track and lies near the middle of the tightly packed NHC model guidance suite. Although Fred is weakening, the system is still expected to bring flooding rains to portions of the southeastern and eastern United States during the next couple of days. This is the last advisory issued by the National Hurricane Center on Fred. Future information on this system can be found in Public Advisories issued by the Weather Prediction Center beginning at 11 AM ED, under AWIPS header TCPAT1, WMO header WTNT31 KWNH, and on the web at http://www.wpc.ncep.noaa.gov. KEY MESSAGES: 1. Through Tuesday, heavy rainfall may lead to considerable flash, urban, small stream, and isolated river flooding impacts across portions of the Florida Panhandle, southeastern Alabama, and from western Georgia into the southern Appalachians. By the middle of the week, Fred or its remnants will lift northward and impact the central Appalachians and Mid-Atlantic. Landslides are possible across the mountains of North Carolina and Blue Ridge Escarpment on Tuesday. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 32.3N 85.0W 30 KT 35 MPH...INLAND 12H 17/1800Z 34.2N 84.3W 25 KT 30 MPH...INLAND 24H 18/0600Z 37.0N 82.6W 20 KT 25 MPH...POST-TROP/INLAND 36H 18/1800Z 39.6N 80.4W 20 KT 25 MPH...POST-TROP/INLAND 48H 19/0600Z...DISSIPATED $$ Forecaster Stewart
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Summary for Tropical Storm Fred (AT1/AL062021)
2021-08-17 07:42:25| National Hurricane Center (Atlantic)
...CENTER OF FRED MOVING OVER EXTREME SOUTHEASTERN ALABAMA... ...HEAVY RAIN AND FLOOD THREAT SPREADING INLAND... As of 1:00 AM CDT Tue Aug 17 the center of Fred was located near 31.7, -85.2 with movement N at 13 mph. The minimum central pressure was 1004 mb with maximum sustained winds of about 40 mph.
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Tropical Storm Fred Public Advisory Number 30A
2021-08-17 07:42:25| National Hurricane Center (Atlantic)
Issued at 100 AM CDT Tue Aug 17 2021 000 WTNT31 KNHC 170542 TCPAT1 BULLETIN Tropical Storm Fred Intermediate Advisory Number 30A NWS National Hurricane Center Miami FL AL062021 100 AM CDT Tue Aug 17 2021 ...CENTER OF FRED MOVING OVER EXTREME SOUTHEASTERN ALABAMA... ...HEAVY RAIN AND FLOOD THREAT SPREADING INLAND... SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...31.7N 85.2W ABOUT 20 MI...30 KM SSW OF EUFAULA ALABAMA ABOUT 30 MI...45 KM NNE OF DOTHAN ALABAMA MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...N OR 5 DEGREES AT 13 MPH...20 KM/H MINIMUM CENTRAL PRESSURE...1004 MB...29.65 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 100 AM CDT (0600 UTC), the center of Tropical Storm Fred was located near latitude 31.7 North, longitude 85.2 West. Fred is moving toward the north near 13 mph (20 km/h), and this general motion is forecast to continue early this morning. A motion toward the north-northeast with an increase in forward speed is expected to begin by late morning and continue for the next day or so. On the forecast track, the center of Fred will move across western and northern Georgia today, across the southern Appalachian Mountains tonight, and into the central Appalachians by early Wednesday. NOAA Doppler weather radar data indicate that maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Weakening is expected, and Fred should become a tropical depression later this morning. Tropical-storm-force winds extend outward up to 45 miles (75 km), mainly to the northeast of the center. The estimated minimum central pressure based on nearby surface observations is 1004 mb (29.65 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Fred can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT1, WMO header WTNT41 KNHC and on the web at www.hurricanes.gov/graphics_at1.shtml?key_messages. RAINFALL: Fred is expected to produce the following rainfall amounts: Through Today... The Florida Big Bend and Panhandle... 4 to 8 inches of rain with isolated maximum storm totals of 12 inches are expected. Southeast Alabama through western and northern Georgia, and the western Carolinas... 4 to 8 inches of rain with isolated maximum storm totals of 10 inches are expected. Through Wednesday... Portions of the Mid-Atlantic States...2 to 4 inches of rain with isolated maximum storm totals of 6 inches expected as Fred interacts with a nearby front. Heavy rainfall across portions of the Southeast and Mid-Atlantic States could lead to flash, urban, small stream and isolated river flooding impacts. An increased risk of landslides exists across the mountains of North Carolina as well as portions of the Blue Ridge Escarpment today. For the latest rainfall reports and wind gusts associated with Tropical Storm Fred, see the companion storm summary at WBCSCCNS1 with the WMO header ACUS41 KWBC or at the following link: https://www.wpc.ncep.noaa.gov/discussions/nfdscc1.html STORM SURGE: Water levels along the Florida Gulf coast may remain elevated throughout the high tide cycle and subside thereafter. Consult products issued by your local National Weather Service forecast office for additional information. WIND: Tropical-storm-force winds, primarily in gusts will continue over inland portions of southeastern Alabama, southwestern Georgia, and the eastern Florida Panhandle for a few more hours. SURF: Swells generated by Fred affecting the coasts of Mississippi, Alabama and the Florida Panhandle should subside overnight. TORNADOES: A tornado or two are possible overnight across parts of the eastern Florida Panhandle and southwest Georgia. The tornado threat will shift northward into parts of northeastern Georgia, the western Carolinas, and southern Virginia today. NEXT ADVISORY ------------- Next complete advisory at 400 AM CDT. $$ Forecaster Stewart
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Tropical Storm Fred Graphics
2021-08-17 07:42:03| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Tue, 17 Aug 2021 05:42:03 GMT Wind Speed Probabilities last updated Tue, 17 Aug 2021 03:23:09 GMT
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Tropical Storm Fred Forecast Discussion Number 30
2021-08-17 04:48:24| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Mon Aug 16 2021 778 WTNT41 KNHC 170248 TCDAT1 Tropical Storm Fred Discussion Number 30 NWS National Hurricane Center Miami FL AL062021 1000 PM CDT Mon Aug 16 2021 The center of Fred has continued to move inland across the Florida Panhandle this evening, and is now located over extreme southeastern Alabama. Doppler velocities from NWS Doppler radars have gradually decreased and that data, along with recent surface observations, indicate that Fred is now a 35-kt tropical storm. Weakening should continue over the next several hours and Fred is expected to weaken to a tropical depression overnight. Additional weakening will occur on Tuesday while the circulation moves inland over Georgia and into the southern Appalachians. The global model guidance indicates that Fred's circulation will open into a trough of low pressure on Wednesday near the central Appalachians. Fred is moving north-northeastward or 015/10 kt. There is no change to the track forecast philosophy from the previous advisory. The cyclone should move north-northeastward at a faster forward speed between a mid-tropospheric ridge over the western Atlantic and a weak mid-level trough over the east-central United States. The new NHC track forecast is lies near the middle of the tightly packed dynamical model guidance. Although Fred is weakening, it is expected to bring flooding rains to portions of the southeastern and eastern United States during the next couple of days. KEY MESSAGES: 1. Through Tuesday, heavy rainfall may lead to considerable flash, urban, small stream, and isolated river flooding impacts across portions of the Florida Panhandle, southeastern Alabama, and from western Georgia into the southern Appalachians. By the middle of the week, Fred or its remnants will lift northward and impact the central Appalachians and Mid-Atlantic. Landslides are possible across the mountains of North Carolina and Blue Ridge Escarpment on Tuesday. 2. Tropical-storm-force winds, primarily in gusts, will continue over inland sections of the eastern Florida Panhandle, southeastern Alabama, and southwestern Georgia during the next few hours. FORECAST POSITIONS AND MAX WINDS INIT 17/0300Z 31.2N 85.2W 35 KT 40 MPH...INLAND 12H 17/1200Z 32.9N 84.8W 30 KT 35 MPH...INLAND 24H 18/0000Z 35.5N 83.6W 25 KT 30 MPH...POST-TROP/INLAND 36H 18/1200Z 38.5N 81.4W 20 KT 25 MPH...POST-TROP/INLAND 48H 19/0000Z...DISSIPATED $$ Forecaster Brown
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