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Tropical Storm Fred Public Advisory Number 30
2021-08-17 04:47:53| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Mon Aug 16 2021 000 WTNT31 KNHC 170247 TCPAT1 BULLETIN Tropical Storm Fred Advisory Number 30 NWS National Hurricane Center Miami FL AL062021 1000 PM CDT Mon Aug 16 2021 ...CENTER OF FRED MOVES INTO EXTREME SOUTHEASTERN ALABAMA... ...HEAVY RAIN AND FLOOD THREAT SPREADING INLAND... SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...31.2N 85.2W ABOUT 10 MI...20 KM E OF DOTHAN ALABAMA MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NNE OR 15 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning for the coast of the Florida Panhandle has been discontinued. The Storm Surge Warning for the coast of the Florida Panhandle and Florida Big Bend has been 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 Storm Fred was located near latitude 31.2 North, longitude 85.2 West. Fred is moving toward the north-northeast near 12 mph (19 km/h), and this general motion with an increase in forward speed is expected over the next day or so. On the forecast track, the center of Fred will move across western and northern Georgia on Tuesday, across the southern Appalachian Mountains on Tuesday night, and into the central Appalachians by early Wednesday. Maximum sustained winds have decreased to near 40 mph (65 km/h) with higher gusts. Additional weakening is expected, and Fred should become a tropical depression overnight or early Tuesday. Tropical-storm-force winds extend outward up to 45 miles (75 km) from the center. A wind gust to 53 mph (85 km/h) was recently reported at the airport in the Marianna, Florida. The estimated minimum central pressure based on surface observations is 999 mb (29.50 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 Tuesday... 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 on Tuesday. 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 on Tuesday. NEXT ADVISORY ------------- Next intermediate advisory at 100 AM CDT. Next complete advisory at 400 AM CDT. $$ Forecaster Brown
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Tropical Storm Henri Graphics
2021-08-17 04:42:20| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Tue, 17 Aug 2021 02:42:20 GMT Wind Speed Probabilities last updated Tue, 17 Aug 2021 03:35:02 GMT
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Tropical Storm Henri Forecast Discussion Number 5
2021-08-17 04:41:46| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Mon Aug 16 2021 000 WTNT43 KNHC 170241 TCDAT3 Tropical Storm Henri Discussion Number 5 NWS National Hurricane Center Miami FL AL082021 1100 PM AST Mon Aug 16 2021 Bursts of deep convection continue to pulse over the southeastern portion of Henri's circulation. Although the tropical cyclone is still being affected by dry-air entrainment and light-to-moderate shear, the latest subjective and objective satellite intensity estimates are a little higher than before, and a blend of those estimates yields an initial wind speed of 40 kt for this advisory. Henri is forecast to remain over SSTs of 28-29C throughout the forecast period, but the mid-level relative humidity is forecast to remain fairly dry, which is likely to only support gradual strengthening over the next day or so. After that time, a significant increase in northeasterly shear is anticipated, and that is likely to stop further strengthening. As mentioned in the previous advisory, given the small size of Henri, the tropical cyclone is likely to be more susceptible to this shear and it is possible that Henri weakens more than indicated below by day 3. The NHC intensity forecast is a blend of the various statistical aids, and the CTCI and HMNI models. Less weight is again placed on the HWRF model, which remains quite aggressive in strengthening Henri over the next several days despite the expected increase in shear and dry mid-level environment. Henri is moving southwestward or 215/4 kt. The tropical storm is forecast to move in a counterclockwise motion over the next several days as it moves around a mid-tropospheric high that is forecast to shift eastward over the western Atlantic. This motion should take Henri south of Bermuda late Tuesday or Tuesday night. By 72 hours, the storm is expected to reach the western extent of the ridge and turn northward, and then northeastward by the end of the forecast period. There is still some spread in the guidance as to when and how sharp the turn will be. As a result, the NHC track forecast is a blend of the typically reliable GFS and ECMWF models later in the period. FORECAST POSITIONS AND MAX WINDS INIT 17/0300Z 30.7N 63.3W 40 KT 45 MPH 12H 17/1200Z 30.5N 63.8W 45 KT 50 MPH 24H 18/0000Z 30.4N 64.8W 50 KT 60 MPH 36H 18/1200Z 30.3N 66.2W 50 KT 60 MPH 48H 19/0000Z 30.3N 67.8W 50 KT 60 MPH 60H 19/1200Z 30.5N 69.3W 50 KT 60 MPH 72H 20/0000Z 31.3N 70.1W 45 KT 50 MPH 96H 21/0000Z 32.8N 69.7W 45 KT 50 MPH 120H 22/0000Z 35.0N 66.5W 45 KT 50 MPH $$ Forecaster Brown
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Tropical Storm Henri Wind Speed Probabilities Number 5
2021-08-17 04:41:46| National Hurricane Center (Atlantic)
Issued at 0300 UTC TUE AUG 17 2021 000 FONT13 KNHC 170241 PWSAT3 TROPICAL STORM HENRI WIND SPEED PROBABILITIES NUMBER 5 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082021 0300 UTC TUE AUG 17 2021 AT 0300Z THE CENTER OF TROPICAL STORM HENRI WAS LOCATED NEAR LATITUDE 30.7 NORTH...LONGITUDE 63.3 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 40 KTS...45 MPH...75 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 TUE 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 TUE 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT PERIODS TO TO TO TO TO TO TO 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT 00Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT CAPE HATTERAS 34 X X( X) X( X) X( X) 1( 1) 2( 3) X( 3) BERMUDA 34 X 3( 3) 3( 6) 2( 8) 2(10) 3(13) 5(18) $$ FORECASTER BROWN
Summary for Tropical Storm Henri (AT3/AL082021)
2021-08-17 04:41:11| National Hurricane Center (Atlantic)
...HENRI A LITTLE STRONGER... As of 11:00 PM AST Mon Aug 16 the center of Henri was located near 30.7, -63.3 with movement SW at 5 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 45 mph.
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