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Hurricane Larry Graphics
2021-09-06 22:48:51| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Mon, 06 Sep 2021 20:48:51 GMT Wind Speed Probabilities last updated Mon, 06 Sep 2021 20:48:51 GMT
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Hurricane Larry Forecast Discussion Number 25
2021-09-06 22:45:42| National Hurricane Center (Atlantic)
Issued at 500 PM AST Mon Sep 06 2021 000 WTNT42 KNHC 062045 TCDAT2 Hurricane Larry Discussion Number 25 NWS National Hurricane Center Miami FL AL122021 500 PM AST Mon Sep 06 2021 NOAA aircraft have been investigating Larry for much of this afternoon, providing valuable information regarding the structure and intensity of the hurricane. Peak 700-mb flight-level winds of 110 kt with SFMR winds of 101 kt were measured in the northwestern eyewall a couple of hours ago, supporting an intensity of about 100 kt in that portion of the cyclone. During that pass through the hurricane, the aircraft tail Doppler radar measured winds of 121 kt at a height of 3 km in the northeastern eyewall, which equate to about 109 kt at the surface. Therefore, the initial intensity has been adjusted up to 110 kt for this advisory. A pair of dropsondes into the eye of Larry measured a minimum central pressure of 956 mb. Both the aircraft and earlier ASCAT data indicated that hurricane-force winds extend up to 60 n mi from the center, while tropical-storm-force winds extend up to 160 n mi from the center. Larry is maintaining its stable, annular structure with a very large, mostly clear eye. The environment surrounding Larry is not forecast to change much over the next couple of days, so only some minor fluctuations in intensity are anticipated during that time. By 72 hours, decreasing sea-surface temperatures and an increase in vertical wind shear should cause the hurricane to begin weakening. The only change to the NHC intensity forecast was a 5-kt increase through the first few days to accommodate the adjustment required to the initial intensity. By the end of the forecast period, Larry is expected to transition to a powerful extratropical cyclone. The latest NHC forecast remains on the high end of the guidance, closest to the Decay-SHIPS model. The hurricane continues to move northwest at 9 kt to the southwest of a subtropical ridge. The forecast track confidence has remained high over the past few days. Larry should continue its northwestward motion through Wednesday, and then reach the western periphery of the ridge in a few days, causing the cyclone to begin a turn to the north, then northeast late this week. This track would bring Larry on its closest approach to Bermuda on Thursday. After turning northeast, the cyclone should accelerate into the mid-latitude westerlies. The latest NHC forecast is little changed from the previous one, and remains near the middle of tightly clustered track guidance. Key Messages: 1. Large swells generated by Larry are affecting the Lesser Antilles and will spread to portions of the Greater Antilles, the Bahamas, and Bermuda today through Tuesday. Significant swells should reach the east coast of the United States and Atlantic Canada by midweek and continue affecting these shores through the end of the week. These swells will likely cause life-threatening surf and rip current conditions, and beachgoers and other interests along these coasts are urged to follow the guidance of lifeguards and local officials this week. 2. Larry is forecast to approach Bermuda during the next few days as a large and powerful hurricane, bringing a risk of strong winds, heavy rainfall, and coastal flooding to the island by the middle of this week. While it is too soon to determine the magnitude of these hazards and potential impacts on Bermuda, interests there should closely monitor the latest forecast updates during the next several days. FORECAST POSITIONS AND MAX WINDS INIT 06/2100Z 22.5N 53.9W 110 KT 125 MPH 12H 07/0600Z 23.4N 55.0W 110 KT 125 MPH 24H 07/1800Z 24.9N 56.3W 105 KT 120 MPH 36H 08/0600Z 26.5N 57.6W 105 KT 120 MPH 48H 08/1800Z 28.3N 59.1W 105 KT 120 MPH 60H 09/0600Z 30.4N 60.7W 105 KT 120 MPH 72H 09/1800Z 33.1N 61.7W 100 KT 115 MPH 96H 10/1800Z 41.2N 57.9W 90 KT 105 MPH 120H 11/1800Z 51.7N 46.4W 70 KT 80 MPH...POST-TROP/EXTRATROP $$ Forecaster Latto
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Hurricane Larry Wind Speed Probabilities Number 25
2021-09-06 22:45:14| National Hurricane Center (Atlantic)
Issued at 2100 UTC MON SEP 06 2021 000 FONT12 KNHC 062045 PWSAT2 HURRICANE LARRY WIND SPEED PROBABILITIES NUMBER 25 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 2100 UTC MON SEP 06 2021 AT 2100Z THE CENTER OF HURRICANE LARRY WAS LOCATED NEAR LATITUDE 22.5 NORTH...LONGITUDE 53.9 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 110 KTS...125 MPH...205 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 18Z MON 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 18Z MON 06Z TUE 18Z TUE 06Z WED 18Z WED 18Z THU 18Z FRI PERIODS TO TO TO TO TO TO TO 06Z TUE 18Z TUE 06Z WED 18Z WED 18Z THU 18Z FRI 18Z SAT FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT HIBERNIA OILFD 34 X X( X) X( X) X( X) X( X) X( X) 61(61) HIBERNIA OILFD 50 X X( X) X( X) X( X) X( X) X( X) 27(27) HIBERNIA OILFD 64 X X( X) X( X) X( X) X( X) X( X) 10(10) CAPE RACE NFLD 34 X X( X) X( X) X( X) X( X) 5( 5) 63(68) CAPE RACE NFLD 50 X X( X) X( X) X( X) X( X) 1( 1) 38(39) CAPE RACE NFLD 64 X X( X) X( X) X( X) X( X) X( X) 18(18) ILE ST PIERRE 34 X X( X) X( X) X( X) X( X) 6( 6) 33(39) ILE ST PIERRE 50 X X( X) X( X) X( X) X( X) 1( 1) 17(18) ILE ST PIERRE 64 X X( X) X( X) X( X) X( X) X( X) 8( 8) BURGEO NFLD 34 X X( X) X( X) X( X) X( X) 3( 3) 18(21) BURGEO NFLD 50 X X( X) X( X) X( X) X( X) 1( 1) 7( 8) BURGEO NFLD 64 X X( X) X( X) X( X) X( X) X( X) 3( 3) PTX BASQUES 34 X X( X) X( X) X( X) X( X) 3( 3) 9(12) PTX BASQUES 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) PTX BASQUES 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) EDDY POINT NS 34 X X( X) X( X) X( X) X( X) 4( 4) 2( 6) SYDNEY NS 34 X X( X) X( X) X( X) X( X) 6( 6) 8(14) SYDNEY NS 50 X X( X) X( X) X( X) X( X) 1( 1) 3( 4) SYDNEY NS 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) SABLE ISLAND 34 X X( X) X( X) X( X) X( X) 23(23) 8(31) SABLE ISLAND 50 X X( X) X( X) X( X) X( X) 7( 7) 5(12) SABLE ISLAND 64 X X( X) X( X) X( X) X( X) 4( 4) 3( 7) HALIFAX NS 34 X X( X) X( X) X( X) X( X) 6( 6) X( 6) BERMUDA 34 X X( X) X( X) 1( 1) 32(33) 5(38) X(38) BERMUDA 50 X X( X) X( X) X( X) 9( 9) 2(11) X(11) BERMUDA 64 X X( X) X( X) X( X) 3( 3) 2( 5) X( 5) $$ FORECASTER LATTO
Summary for Hurricane Larry (AT2/AL122021)
2021-09-06 22:44:41| National Hurricane Center (Atlantic)
...NOAA AIRCRAFT FINDS LARRY SLIGHTLY STRONGER... ...EXPECTED TO CAUSE DANGEROUS SURF AND RIP CURRENTS ALONG WESTERN ATLANTIC SHORES LATER THIS WEEK... As of 5:00 PM AST Mon Sep 6 the center of Larry was located near 22.5, -53.9 with movement NW at 10 mph. The minimum central pressure was 956 mb with maximum sustained winds of about 125 mph.
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Hurricane Larry Forecast Advisory Number 25
2021-09-06 22:44:11| National Hurricane Center (Atlantic)
Issued at 2100 UTC MON SEP 06 2021 000 WTNT22 KNHC 062044 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 25 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 2100 UTC MON SEP 06 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. HURRICANE CENTER LOCATED NEAR 22.5N 53.9W AT 06/2100Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 310 DEGREES AT 9 KT ESTIMATED MINIMUM CENTRAL PRESSURE 956 MB MAX SUSTAINED WINDS 110 KT WITH GUSTS TO 135 KT. 64 KT....... 60NE 50SE 40SW 50NW. 50 KT....... 90NE 80SE 70SW 80NW. 34 KT.......160NE 150SE 100SW 140NW. 12 FT SEAS..330NE 300SE 300SW 300NW. 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 22.5N 53.9W AT 06/2100Z AT 06/1800Z CENTER WAS LOCATED NEAR 22.2N 53.6W FORECAST VALID 07/0600Z 23.4N 55.0W MAX WIND 110 KT...GUSTS 135 KT. 64 KT... 60NE 50SE 40SW 50NW. 50 KT... 90NE 80SE 70SW 80NW. 34 KT...160NE 150SE 100SW 140NW. FORECAST VALID 07/1800Z 24.9N 56.3W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 60NE 50SE 40SW 50NW. 50 KT... 90NE 90SE 70SW 80NW. 34 KT...160NE 150SE 110SW 140NW. FORECAST VALID 08/0600Z 26.5N 57.6W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 70NE 60SE 40SW 50NW. 50 KT...100NE 90SE 70SW 80NW. 34 KT...160NE 160SE 120SW 140NW. FORECAST VALID 08/1800Z 28.3N 59.1W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 70NE 60SE 40SW 50NW. 50 KT...100NE 100SE 80SW 90NW. 34 KT...170NE 160SE 120SW 140NW. FORECAST VALID 09/0600Z 30.4N 60.7W MAX WIND 105 KT...GUSTS 130 KT. 50 KT...110NE 100SE 80SW 90NW. 34 KT...170NE 170SE 130SW 140NW. FORECAST VALID 09/1800Z 33.1N 61.7W MAX WIND 100 KT...GUSTS 120 KT. 50 KT...110NE 110SE 80SW 90NW. 34 KT...180NE 180SE 130SW 140NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 10/1800Z 41.2N 57.9W MAX WIND 90 KT...GUSTS 110 KT. OUTLOOK VALID 11/1800Z 51.7N 46.4W...POST-TROP/EXTRATROP MAX WIND 70 KT...GUSTS 85 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 22.5N 53.9W NEXT ADVISORY AT 07/0300Z $$ FORECASTER LATTO
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