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Hurricane Larry Forecast Advisory Number 31

2021-09-08 10:48:34| National Hurricane Center (Atlantic)

Issued at 0900 UTC WED SEP 08 2021 859 WTNT22 KNHC 080848 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 31 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 0900 UTC WED SEP 08 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * BERMUDA A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...IN THIS CASE WITHIN THE NEXT 36 HOURS. INTERESTS IN SOUTHEASTERN NEWFOUNDLAND SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. HURRICANE CENTER LOCATED NEAR 26.5N 57.3W AT 08/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 325 DEGREES AT 9 KT ESTIMATED MINIMUM CENTRAL PRESSURE 967 MB MAX SUSTAINED WINDS 100 KT WITH GUSTS TO 120 KT. 64 KT....... 60NE 50SE 40SW 50NW. 50 KT.......100NE 90SE 70SW 90NW. 34 KT.......160NE 160SE 120SW 150NW. 12 FT SEAS..360NE 300SE 330SW 330NW. 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 26.5N 57.3W AT 08/0900Z AT 08/0600Z CENTER WAS LOCATED NEAR 26.2N 57.1W FORECAST VALID 08/1800Z 28.0N 58.7W MAX WIND 95 KT...GUSTS 115 KT. 64 KT... 60NE 50SE 40SW 50NW. 50 KT...100NE 90SE 70SW 90NW. 34 KT...160NE 160SE 120SW 150NW. FORECAST VALID 09/0600Z 30.1N 60.6W MAX WIND 95 KT...GUSTS 115 KT. 64 KT... 70NE 60SE 40SW 50NW. 50 KT...100NE 100SE 70SW 90NW. 34 KT...170NE 170SE 120SW 140NW. FORECAST VALID 09/1800Z 32.9N 61.9W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 70NE 60SE 40SW 50NW. 50 KT...110NE 100SE 80SW 90NW. 34 KT...180NE 170SE 120SW 140NW. FORECAST VALID 10/0600Z 36.7N 61.6W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 60NE 50SE 40SW 50NW. 50 KT...110NE 100SE 80SW 90NW. 34 KT...180NE 180SE 140SW 140NW. FORECAST VALID 10/1800Z 41.7N 58.3W MAX WIND 80 KT...GUSTS 100 KT. 50 KT...110NE 110SE 80SW 80NW. 34 KT...200NE 200SE 160SW 130NW. FORECAST VALID 11/0600Z 47.3N 52.4W MAX WIND 75 KT...GUSTS 90 KT. 50 KT...110NE 110SE 80SW 60NW. 34 KT...200NE 200SE 190SW 120NW. 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 12/0600Z 58.8N 40.0W...POST-TROP/EXTRATROP MAX WIND 60 KT...GUSTS 75 KT. OUTLOOK VALID 13/0600Z 65.0N 33.0W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 26.5N 57.3W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 08/1200Z NEXT ADVISORY AT 08/1500Z $$ FORECASTER BROWN

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Tropical Depression Fifteen-E Forecast Discussion Number 2

2021-09-08 04:43:53| National Hurricane Center (East Pacific)

Issued at 900 PM MDT Tue Sep 07 2021 000 WTPZ45 KNHC 080243 TCDEP5 Tropical Depression Fifteen-E Discussion Number 2 NWS National Hurricane Center Miami FL EP152021 900 PM MDT Tue Sep 07 2021 Satellite imagery indicates that Tropical Depression Fifteen-E has changed little in organization during the past several hours. While the system is producing good convective banding in the eastern semicircle, the convection near the center is currently poorly organized, and there is no evidence that the inner core has consolidated. Thus, the initial intensity remains 30 kt based mainly on continuity from the previous advisory. A combination of conventional and 37 GHz microwave satellite imagery suggests that the center is farther east than previously thought, so the new initial position is about a half degree east of the previous advisory position. The initial motion is a somewhat uncertain 300/5. A large mid-level anticyclone is located over the southwestern United States with a ridge extending southeastward across Mexico. The anticyclone should shift a little eastward during the next few days, with the ridge extending southward across Mexico. This evolution should steer the tropical cyclone generally northwestward for the next several days, followed by a more westward motion as the cyclone weakens over cooler water and is steered by low-level easterly flow. The track guidance is in good agreement with this scenario, and the new forecast track is near the consensus models. However, the more eastward initial position required an eastward shift to the forecast track. It should be noted that some erratic motion is possible until the cyclone develops a better-defined inner core. Conditions appear favorable for strengthening until the system reaches the 26-deg-C SST isotherm in 60-72 h, with the main restraining factor being the current lack of internal organization. The intensity forecast has only minor adjustments from the previous forecast and calls for the depression to become a tropical storm in about 12 h and a hurricane in about 48 h. Steady to rapid weakening is expected after 60-72 h due to the cooler water and dry air entrainment. The more easterly initial position and the new forecast track require a Tropical Storm Watch for portions of Baja California Sur at this time. Interests elsewhere in Baja California Sur should monitor the progress of this system. FORECAST POSITIONS AND MAX WINDS INIT 08/0300Z 18.2N 107.4W 30 KT 35 MPH 12H 08/1200Z 18.6N 107.7W 35 KT 40 MPH 24H 09/0000Z 19.4N 108.4W 45 KT 50 MPH 36H 09/1200Z 20.4N 109.2W 55 KT 65 MPH 48H 10/0000Z 21.7N 110.6W 65 KT 75 MPH 60H 10/1200Z 22.8N 112.0W 65 KT 75 MPH 72H 11/0000Z 23.7N 113.7W 55 KT 65 MPH 96H 12/0000Z 24.5N 116.5W 40 KT 45 MPH 120H 13/0000Z 24.0N 119.0W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Beven

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Hurricane Larry Forecast Discussion Number 30

2021-09-08 04:43:23| National Hurricane Center (Atlantic)

Issued at 1100 PM AST Tue Sep 07 2021 000 WTNT42 KNHC 080243 TCDAT2 Hurricane Larry Discussion Number 30 NWS National Hurricane Center Miami FL AL122021 1100 PM AST Tue Sep 07 2021 Larry's eye has become a little better defined since the previous advisory, and the eyewall convective cloud tops have cooled, with a nearly solid ring of -65C to -70C now surrounding the eye. Data from an Air Force Reserve Hurricane Hunter aircraft indicate that the central pressure has risen slightly to 966-968 mb and that peak 700-mb flight-level winds measured were 106 kt in the northeast quadrant. These data would suggest that the intensity has decreased a little to 95-96 kt. However, the peak flight-level wind of 106 kt was measured in the wake of a strong eyewall convective burst, suggesting that stronger winds could have been present in that convection. Also, if the surrounding eyewall convective ring closes off during the nocturnal convective maximum period in another six hours, then Dvorak intensity estimates would increase from the current T5.0/90 kt to T5.5/102 kt. Thus, Larry's intensity has been maintained at 100 kt for this advisory in order to avoid possible intensity vacillations. The initial motion estimate is 325/10 kt, based on reconnaissance aircraft fixes over the past 12 hours. There remains no significant change to the track forecast or reasoning over the past 48 hours. The latest NHC model guidance remains in strong agreement on Larry continuing to move northwestward and then northward around the western periphery of a deep-layer subtropical ridge during the next 48 hours or so. After passing east of Bermuda by early day 3, the hurricane is forecast to accelerate northeastward and move into the mid-latitude westerlies ahead of a large, eastward-moving trough that is currently approaching the northeastern United States and Atlantic Canada. By day 5, Larry is expected to move across the far north Atlantic. The new NHC track forecast is similar to the previous advisory track, and lies along the eastern edge of the tightly packed simple- and corrected-consensus track models. Larry's upper-level outflow pattern remains impressive, and has even expanded and accelerated on the east side owing to a southward-digging upper-level trough, which has enhanced the outflow in that part of the hurricane. The vertical wind shear affecting Larry is expected to remain low for the next 24 hours or so while the hurricane passes over even warmer sea-surface temperatures (SST) approaching 29.7 deg C, even though the oceanic heat content will be decreasing. However, entrainment of dry mid-level air along with eye fluctuations are expected to offset the warmer SSTs. Thus, a slow but steady decrease in intensity through 48-60 hours is expected. Late in the forecast period, colder waters and increasing southwesterly vertical wind shear exceeding 30 kt should induce a faster rate of weakening. By 96-120 hours, the global models also indicate Larry will be merging with a frontal zone. Therefore, the new intensity forecast continues to show extratropical transition during that time period. The official intensity forecast is similar to the previous advisory, and closely follows the simple- and corrected-consensus intensity models IVCN and NOAA-HCCA. Key Messages: 1. Large swells generated by Larry will continue to affect the Lesser Antilles, portions of the Greater Antilles, and the Bahamas through midweek. 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. The center of Larry is forecast to pass east of Bermuda on Thursday, but given Larry's large size, tropical storm conditions are possible there Thursday, along with a risk of heavy rainfall and coastal flooding. A Tropical Storm Watch is in effect for Bermuda and interests there should closely monitor the latest forecast updates. 3. Larry is forecast to move near or over portions of southeastern Newfoundland late Friday and Friday night as it transitions to a hurricane-force post-tropical cyclone. There is a risk of impacts from high winds, rainfall, and storm surge in portions of Newfoundland, and interests there should monitor the progress of Larry and updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 08/0300Z 25.8N 56.8W 100 KT 115 MPH 12H 08/1200Z 27.2N 58.0W 95 KT 110 MPH 24H 09/0000Z 29.2N 59.6W 95 KT 110 MPH 36H 09/1200Z 31.5N 61.3W 90 KT 105 MPH 48H 10/0000Z 34.6N 61.8W 90 KT 105 MPH 60H 10/1200Z 39.1N 60.1W 85 KT 100 MPH 72H 11/0000Z 44.5N 55.7W 80 KT 90 MPH 96H 12/0000Z 56.2N 43.6W 65 KT 75 MPH...POST-TROP/EXTRATROP 120H 13/0000Z 62.8N 33.6W 50 KT 60 MPH...POST-TROP/EXTRATROP $$ Forecaster Stewart

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Hurricane Larry Forecast Advisory Number 30

2021-09-08 04:42:53| National Hurricane Center (Atlantic)

Issued at 0300 UTC WED SEP 08 2021 000 WTNT22 KNHC 080242 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 30 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 0300 UTC WED SEP 08 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * BERMUDA A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...IN THIS CASE WITHIN THE NEXT 36 HOURS. HURRICANE CENTER LOCATED NEAR 25.8N 56.8W AT 08/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 325 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 967 MB EYE DIAMETER 40 NM MAX SUSTAINED WINDS 100 KT WITH GUSTS TO 120 KT. 64 KT....... 60NE 50SE 40SW 50NW. 50 KT.......100NE 90SE 70SW 90NW. 34 KT.......160NE 160SE 120SW 150NW. 12 FT SEAS..300NE 270SE 240SW 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 25.8N 56.8W AT 08/0300Z AT 08/0000Z CENTER WAS LOCATED NEAR 25.4N 56.5W FORECAST VALID 08/1200Z 27.2N 58.0W MAX WIND 95 KT...GUSTS 115 KT. 64 KT... 60NE 50SE 40SW 50NW. 50 KT...100NE 90SE 70SW 90NW. 34 KT...160NE 160SE 120SW 150NW. FORECAST VALID 09/0000Z 29.2N 59.6W MAX WIND 95 KT...GUSTS 115 KT. 64 KT... 70NE 60SE 40SW 50NW. 50 KT...100NE 100SE 70SW 90NW. 34 KT...170NE 170SE 120SW 140NW. FORECAST VALID 09/1200Z 31.5N 61.3W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 70NE 60SE 40SW 50NW. 50 KT...110NE 100SE 80SW 90NW. 34 KT...180NE 170SE 120SW 140NW. FORECAST VALID 10/0000Z 34.6N 61.8W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 60NE 50SE 40SW 50NW. 50 KT...110NE 100SE 80SW 90NW. 34 KT...180NE 180SE 130SW 140NW. FORECAST VALID 10/1200Z 39.1N 60.1W MAX WIND 85 KT...GUSTS 105 KT. 50 KT...110NE 110SE 80SW 80NW. 34 KT...190NE 180SE 130SW 140NW. FORECAST VALID 11/0000Z 44.5N 55.7W MAX WIND 80 KT...GUSTS 100 KT. 50 KT...110NE 110SE 80SW 60NW. 34 KT...190NE 200SE 180SW 120NW. 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 12/0000Z 56.2N 43.6W...POST-TROP/EXTRATROP MAX WIND 65 KT...GUSTS 80 KT. OUTLOOK VALID 13/0000Z 62.8N 33.6W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 25.8N 56.8W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 08/0600Z NEXT ADVISORY AT 08/0900Z $$ FORECASTER STEWART

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Tropical Depression Fifteen-E Forecast Advisory Number 2

2021-09-08 04:42:53| National Hurricane Center (East Pacific)

Issued at 0300 UTC WED SEP 08 2021 000 WTPZ25 KNHC 080242 TCMEP5 TROPICAL DEPRESSION FIFTEEN-E FORECAST/ADVISORY NUMBER 2 NWS NATIONAL HURRICANE CENTER MIAMI FL EP152021 0300 UTC WED SEP 08 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE METEOROLOGICAL SERVICE OF MEXICO HAS ISSUED A TROPICAL STORM WATCH FOR THE SOUTHERN PORTION OF BAJA CALIFORNIA SUR FROM TODOS SANTOS TO LOS BARRILES. A TROPICAL STORM WATCH IS IN EFFECT FOR... * THE SOUTHERN PORTION OF BAJA CALIFORNIA SUR FROM TODOS SANTOS TO LOS BARRILES A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. INTERESTS ELSEWHERE IN BAJA CALIFORNIA SUR SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL DEPRESSION CENTER LOCATED NEAR 18.2N 107.4W AT 08/0300Z POSITION ACCURATE WITHIN 40 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 300 DEGREES AT 4 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1007 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 18.2N 107.4W AT 08/0300Z AT 08/0000Z CENTER WAS LOCATED NEAR 18.1N 107.3W FORECAST VALID 08/1200Z 18.6N 107.7W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 50NE 40SE 0SW 0NW. FORECAST VALID 09/0000Z 19.4N 108.4W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 60NE 50SE 0SW 40NW. FORECAST VALID 09/1200Z 20.4N 109.2W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 20NE 0SE 0SW 0NW. 34 KT... 70NE 50SE 40SW 50NW. FORECAST VALID 10/0000Z 21.7N 110.6W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 15NE 0SE 0SW 0NW. 50 KT... 30NE 20SE 0SW 0NW. 34 KT... 80NE 50SE 40SW 60NW. FORECAST VALID 10/1200Z 22.8N 112.0W MAX WIND 65 KT...GUSTS 80 KT. 50 KT... 30NE 20SE 0SW 30NW. 34 KT... 80NE 50SE 40SW 60NW. FORECAST VALID 11/0000Z 23.7N 113.7W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 20SE 0SW 30NW. 34 KT... 70NE 60SE 50SW 60NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 125 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 12/0000Z 24.5N 116.5W MAX WIND 40 KT...GUSTS 50 KT. OUTLOOK VALID 13/0000Z 24.0N 119.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.2N 107.4W INTERMEDIATE PUBLIC ADVISORY...WTNT35 KNHC/MIATCPEP5...AT 08/0600Z NEXT ADVISORY AT 08/0900Z $$ FORECASTER BEVEN

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