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Tropical Depression Sally Public Advisory Number 24
2020-09-17 04:33:08| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Wed Sep 16 2020 279 WTNT34 KNHC 170233 TCPAT4 BULLETIN Tropical Depression Sally Advisory Number 24 NWS National Hurricane Center Miami FL AL192020 1000 PM CDT Wed Sep 16 2020 ...SALLY STILL CAUSING TORRENTIAL RAINS OVER EASTERN ALABAMA AND WESTERN GEORGIA... SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...31.9N 86.1W ABOUT 30 MI...50 KM SSE OF MONTGOMERY ALABAMA MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...NE OR 45 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...995 MB...29.39 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning from the Okaloosa/Walton County Florida line eastward to Indian Pass Florida is discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: 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 1000 PM CDT (0300 UTC), the center of Tropical Depression Sally was located near latitude 31.9 North, longitude 86.1 West. The depression is moving toward the northeast near 9 mph (15 km/h), and a northeastward to east-northeastward motion at a faster forward speed is expected into Friday. On the forecast track, the center of Sally will move across southeastern Alabama tonight, over central Georgia on Thursday, and move over South Carolina Thursday night. Maximum sustained winds have decreased to near 35 mph (55 km/h) with higher gusts. Additional weakening is forecast during the next couple of days, and Sally is expected to become a remnant low on Friday. The estimated minimum central pressure is 995 mb (29.39 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Sally can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml RAINFALL: Rainfall totals expected as Sally tracks across the Southeast through Friday: Southeast Alabama and central Georgia: 4 to 8 inches with isolated amounts of 12 inches, resulting in significant flash flooding and widespread minor to moderate and isolated major river flooding. Central to upstate South Carolina: 4 to 7 inches, with isolated amounts of 10 inches. Widespread flash flooding and minor to moderate river flooding is possible. Western to central North Carolina and far southeast Virginia: 4 to 6 inches, isolated amounts up to 8 inches. Scattered flash flooding and widespread minor river flooding is possible. Sally has produced storm totals of 10 to 20 inches, with isolated amounts of 30-35 inches, across the central Gulf Coast from the Florida Panhandle west of Tallahassee to Mobile Bay, Alabama. Most moderate to major river flooding will crest by the weekend, but rivers will remain elevated. STORM SURGE: Water levels remain elevated along the Florida Panhandle coast but will continue to recede over the next several hours. TORNADOES: A couple of tornadoes may occur overnight across southern Georgia and northern Florida. The threat of tornadoes will shift northeastward into eastern Georgia and much of the Carolinas on Thursday. SURF: Swells from Sally will continue to affect the Gulf Coast from the Florida Big Bend westward to southeastern Louisiana during the next day or so. These swells are likely to cause life- threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 400 AM CDT. $$ Forecaster Pasch
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Tropical Depression Sally Wind Speed Probabilities Number 24
2020-09-17 04:33:08| National Hurricane Center (Atlantic)
Issued at 0300 UTC THU SEP 17 2020 281 FONT14 KNHC 170233 PWSAT4 TROPICAL DEPRESSION SALLY WIND SPEED PROBABILITIES NUMBER 24 NWS NATIONAL HURRICANE CENTER MIAMI FL AL192020 0300 UTC THU SEP 17 2020 AT 0300Z THE CENTER OF TROPICAL DEPRESSION SALLY WAS LOCATED NEAR LATITUDE 31.9 NORTH...LONGITUDE 86.1 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 00Z THU AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 00Z THU 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON PERIODS TO TO TO TO TO TO TO 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON 00Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT GREENSBORO NC 34 X X( X) 3( 3) X( 3) X( 3) X( 3) X( 3) RALEIGH NC 34 X X( X) 4( 4) X( 4) X( 4) X( 4) X( 4) ROCKY MT NC 34 X X( X) 4( 4) X( 4) X( 4) X( 4) X( 4) FAYETTEVILLE 34 X X( X) 10(10) X(10) X(10) X(10) X(10) CHARLOTTE NC 34 X 3( 3) 4( 7) X( 7) X( 7) X( 7) X( 7) CHERRY PT NC 34 X X( X) 4( 4) X( 4) X( 4) X( 4) X( 4) NEW RIVER NC 34 X X( X) 6( 6) X( 6) X( 6) X( 6) X( 6) MOREHEAD CITY 34 X X( X) 3( 3) X( 3) X( 3) X( 3) X( 3) SURF CITY NC 34 X X( X) 6( 6) X( 6) X( 6) X( 6) X( 6) WILMINGTON NC 34 X X( X) 7( 7) X( 7) X( 7) X( 7) X( 7) BALD HEAD ISL 34 X X( X) 6( 6) X( 6) X( 6) X( 6) X( 6) FLORENCE SC 34 X 1( 1) 11(12) X(12) X(12) X(12) X(12) COLUMBIA SC 34 X 7( 7) 6(13) X(13) X(13) X(13) X(13) LITTLE RIVER 34 X X( X) 7( 7) X( 7) X( 7) X( 7) X( 7) MYRTLE BEACH 34 X 1( 1) 6( 7) X( 7) X( 7) X( 7) X( 7) GEORGETOWN SC 34 X 1( 1) 5( 6) X( 6) X( 6) X( 6) X( 6) CHARLESTON SC 34 X 1( 1) 3( 4) X( 4) X( 4) X( 4) X( 4) BEAUFORT MCAS 34 X 2( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) ATLANTA GA 34 11 4(15) X(15) X(15) X(15) X(15) X(15) AUGUSTA GA 34 2 11(13) 2(15) X(15) X(15) X(15) X(15) SAVANNAH GA 34 1 2( 3) X( 3) X( 3) X( 3) X( 3) X( 3) WAYCROSS GA 34 2 X( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) TALLAHASSEE FL 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) DESTIN EXEC AP 34 99 X(99) X(99) X(99) X(99) X(99) X(99) COLUMBUS GA 34 34 X(34) X(34) X(34) X(34) X(34) X(34) BIRMINGHAM AL 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) MONTGOMERY AL 34 99 X(99) X(99) X(99) X(99) X(99) X(99) WHITING FLD FL 34 99 X(99) X(99) X(99) X(99) X(99) X(99) PENSACOLA FL 34 99 X(99) X(99) X(99) X(99) X(99) X(99) PENSACOLA NAS 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) $$ FORECASTER PASCH
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Tropical Depression Sally Forecast Advisory Number 24
2020-09-17 04:31:42| National Hurricane Center (Atlantic)
Issued at 0300 UTC THU SEP 17 2020 000 WTNT24 KNHC 170231 TCMAT4 TROPICAL DEPRESSION SALLY FORECAST/ADVISORY NUMBER 24 NWS NATIONAL HURRICANE CENTER MIAMI FL AL192020 0300 UTC THU SEP 17 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE TROPICAL STORM WARNING FROM THE OKALOOSA/WALTON COUNTY FLORIDA LINE EASTWARD TO INDIAN PASS FLORIDA IS DISCONTINUED. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 31.9N 86.1W AT 17/0300Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 45 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 995 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 31.9N 86.1W AT 17/0300Z AT 17/0000Z CENTER WAS LOCATED NEAR 31.5N 86.5W FORECAST VALID 17/1200Z 32.7N 85.0W...INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 18/0000Z 34.0N 82.5W...INLAND MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 18/1200Z 35.0N 79.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 19/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 31.9N 86.1W NEXT ADVISORY AT 17/0900Z $$ FORECASTER PASCH
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Tropical Storm Sally Public Advisory Number 23A
2020-09-17 01:51:36| National Hurricane Center (Atlantic)
Issued at 700 PM CDT Wed Sep 16 2020 000 WTNT34 KNHC 162351 TCPAT4 BULLETIN Tropical Storm Sally Intermediate Advisory Number 23A NWS National Hurricane Center Miami FL AL192020 700 PM CDT Wed Sep 16 2020 ...HEAVY RAINS FROM SALLY CONTINUE TO SPREAD NORTHWARD OVER EASTERN ALABAMA AND WESTERN GEORGIA... ...CATASTROPHIC AND LIFE-THREATENING FLOODING CONTINUES OVER PORTIONS OF THE FLORIDA PANHANDLE AND SOUTHERN ALABAMA... SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...31.5N 86.5W ABOUT 70 MI...110 KM WNW OF DOTHAN ALABAMA MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...NE OR 35 DEGREES AT 7 MPH...11 KM/H MINIMUM CENTRAL PRESSURE...994 MB...29.35 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Storm Surge Warning from the Alabama/Florida border to the Walton/Bay County Florida line is discontinued. The Tropical Storm Warning west of the Okaloosa/Walton County Florida line is discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Okaloosa/Walton County Florida line eastward to Indian Pass Florida A Tropical Storm Warning means that tropical storm conditions are occurring within the warning area. 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 700 PM CDT (0000 UTC), the center of Tropical Storm Sally was located near latitude 31.5 North, longitude 86.5 West. Sally is moving toward the northeast near 7 mph (11 km/h), and a northeastward motion at a slightly faster forward speed is expected tonight through Thursday night. On the forecast track, the center of Sally will move across southeastern Alabama tonight, over central Georgia on Thursday, and move over South Carolina Thursday night. Maximum sustained winds have decreased to near 45 mph (75 km/h) with higher gusts. Additional weakening is expected as the center moves farther inland tonight, and Sally is forecast to become a tropical depression tonight. Tropical-storm-force winds extend outward up to 125 miles (205 km) from the center. The estimated minimum central pressure is 994 mb (29.35 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Sally can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml RAINFALL: Sally has produced storm totals of 10 to 20 inches, with isolated amounts of 30-35 inches, across the central Gulf Coast from the Florida Panhandle west of Tallahassee to Mobile Bay, Alabama. Historic and catastrophic flooding, including widespread moderate to major river flooding, will continue across this region. Additional rainfall of 1 to 4 inches is possible across the Florida Panhandle from Tallahassee to the Apalachicola River. Rainfall totals expected as Sally tracks across the Southeast through Friday: Southern Alabama and central Georgia: 4 to 8 inches with isolated amounts of 12 inches, resulting in significant flash flooding and widespread minor to moderate and isolated major river flooding. Central to upstate South Carolina: 4 to 7 inches, with isolated amounts of 10 inches. Widespread flash flooding and minor to moderate river flooding is possible. Western to central North Carolina and far southeast Virginia: 4 to 6 inches, isolated amounts up to 8 inches. Scattered flash flooding and widespread minor river flooding is possible. STORM SURGE: Water levels remain elevated along the Florida Panhandle coast but will continue to recede over the next several hours. WIND: Tropical storm conditions will continue in portions of the warning area this evening. TORNADOES: A few tornadoes may occur tonight across portions of northern Florida and southern Georgia. The threat of tornadoes will shift northeastward into parts of eastern Georgia and much of the Carolinas on Thursday. SURF: Swells from Sally will continue to affect the Gulf Coast from the Florida Big Bend westward to southeastern Louisiana during the next day or so. These swells are likely to cause life- threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1000 PM CDT. $$ Forecaster Pasch
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Hurricane Teddy Forecast Discussion Number 18
2020-09-16 22:52:42| National Hurricane Center (Atlantic)
Issued at 500 PM AST Wed Sep 16 2020 000 WTNT45 KNHC 162052 TCDAT5 Hurricane Teddy Discussion Number 18 NWS National Hurricane Center Miami FL AL202020 500 PM AST Wed Sep 16 2020 Recent satellite imagery is suggesting that Teddy is undergoing some westerly vertical wind shear, as indicated by outflow being more limited in the western portion of the circulation. The latest UW-CIMSS shear analysis suggests the magnitude of this shear could be about 10-15 kt, which could help to explain the lack of increase in organization of the cyclone today. The most recent Dvorak satellite intensity estimates provided CI values of 4.5-5.0, indicating that the initial intensity is still around 85 kt. The environmental conditions are not forecast to change much for Teddy over the next couple of days. The cyclone is forecast to move over warm waters within a somewhat dry atmospheric environment, while moderate shear is expected to continue due to an upper trough to its northwest. Based on these only somewhat favorable conditions for strengthening, along with what we have witnessed with the lack of intensification today, the NHC intensity forecast over the next few days is being lowered. Beyond day 3, there is evidence to suggest that Teddy may move over some cooler waters due to upwelling caused by Paulette. And, by day 4 global models are forecasting a further increase in vertical wind shear. These two factors should cause the cyclone to weaken late in the forecast period. This updated intensity forecast is in good agreement with the HFIP corrected consensus, HCCA. Teddy is moving northwestward at about 11 kt. This motion is forecast to continue for the next few days, as the cyclone is steered by a mid-level ridge to its north and northeast. Late in the forecast period, the portion of the ridge north of Teddy is expected to erode as a mid-latitude trough digs across the northeastern United States. This evolution should cause the cyclone to turn north-northwest and possibly north by day 5. The track guidance is tightly clustered through day 3, but increases quite a bit after that time, likely due to how the models are handling the approaching trough. The latest GFS delays a turn and shows a more westerly track, with the cyclone southwest of Bermuda by day 5, while the rest of the global models turn the system north sooner and take the system just east of Bermuda. The NHC track forecast is close to the previous one and is near the various multi-model track consensus aids. On the forecast track, Teddy could make a close to approach to Bermuda in about 5 days. However, based on the model spread at that time frame and average track error of about 200 n mi at 120 h, it is certainly too soon to know what impacts Teddy may have on the island. FORECAST POSITIONS AND MAX WINDS INIT 16/2100Z 17.5N 50.8W 85 KT 100 MPH 12H 17/0600Z 18.6N 52.0W 90 KT 105 MPH 24H 17/1800Z 20.0N 53.4W 100 KT 115 MPH 36H 18/0600Z 21.5N 54.9W 105 KT 120 MPH 48H 18/1800Z 23.0N 56.3W 105 KT 120 MPH 60H 19/0600Z 24.8N 58.0W 100 KT 115 MPH 72H 19/1800Z 26.5N 60.2W 100 KT 115 MPH 96H 20/1800Z 29.5N 63.6W 90 KT 105 MPH 120H 21/1800Z 33.3N 64.6W 85 KT 100 MPH $$ Forecaster Latto
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