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Hurricane Larry Forecast Advisory Number 35

2021-09-09 10:42:49| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 09 2021 000 WTNT22 KNHC 090842 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 35 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 0900 UTC THU SEP 09 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WATCH IS IN EFFECT FOR... * SOUTHEASTERN NEWFOUNDLAND FROM ST. SCHOTTS TO POUCH COVE A TROPICAL STORM WARNING IS IN EFFECT FOR... * BERMUDA A TROPICAL STORM WATCH IS IN EFFECT FOR... * SOUTHEASTERN NEWFOUNDLAND FROM LAMALINE TO WEST OF ST. SCHOTTS * SOUTHEASTERN NEWFOUNDLAND FROM NORTH OF POUCH COVE TO BONAVISTA A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. A WATCH IS TYPICALLY ISSUED 48 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL-STORM-FORCE WINDS...CONDITIONS THAT MAKE OUTSIDE PREPARATIONS DIFFICULT OR DANGEROUS. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA. A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. INTERESTS ELSEWHERE IN SOUTHEASTERN NEWFOUNDLAND SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. HURRICANE CENTER LOCATED NEAR 30.9N 61.1W AT 09/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 330 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 969 MB MAX SUSTAINED WINDS 85 KT WITH GUSTS TO 105 KT. 64 KT....... 80NE 60SE 30SW 50NW. 50 KT.......110NE 110SE 70SW 90NW. 34 KT.......190NE 190SE 140SW 140NW. 12 FT SEAS..430NE 320SE 270SW 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 30.9N 61.1W AT 09/0900Z AT 09/0600Z CENTER WAS LOCATED NEAR 30.2N 60.8W FORECAST VALID 09/1800Z 32.9N 62.1W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 80NE 60SE 30SW 50NW. 50 KT...110NE 110SE 70SW 90NW. 34 KT...190NE 190SE 140SW 140NW. FORECAST VALID 10/0600Z 36.7N 62.0W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 70NE 50SE 40SW 50NW. 50 KT...110NE 110SE 70SW 80NW. 34 KT...190NE 190SE 130SW 130NW. FORECAST VALID 10/1800Z 41.8N 59.0W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 60NE 70SE 50SW 40NW. 50 KT...110NE 120SE 90SW 70NW. 34 KT...200NE 210SE 160SW 110NW. FORECAST VALID 11/0600Z 47.9N 52.5W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 50NE 70SE 40SW 30NW. 50 KT...100NE 120SE 100SW 70NW. 34 KT...190NE 230SE 210SW 110NW. FORECAST VALID 11/1800Z 54.1N 45.9W...POST-TROP/EXTRATROP MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 80NE 110SE 80SW 60NW. 34 KT...250NE 250SE 220SW 110NW. FORECAST VALID 12/0600Z 59.2N 41.2W...POST-TROP/EXTRATROP MAX WIND 60 KT...GUSTS 75 KT. 50 KT...150NE 140SE 100SW 80NW. 34 KT...320NE 270SE 250SW 200NW. 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 13/0600Z...ABSORBED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 30.9N 61.1W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 09/1200Z NEXT ADVISORY AT 09/1500Z $$ FORECASTER ROBERTS

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Tropical Depression Mindy Forecast Advisory Number 3

2021-09-09 10:42:03| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 09 2021 000 WTNT23 KNHC 090841 TCMAT3 TROPICAL DEPRESSION MINDY FORECAST/ADVISORY NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL132021 0900 UTC THU SEP 09 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE TROPICAL STORM WARNING ALONG THE GULF COAST OF FLORIDA HAS BEEN DISCONTINUED. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS ALONG THE ATLANTIC COAST OF NORTHEASTERN FLORIDA AND SOUTHEASTERN GEORGIA SHOULD MONITOR THE PROGRESS OF MINDY. TROPICAL DEPRESSION CENTER LOCATED NEAR 30.8N 83.0W AT 09/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 55 DEGREES AT 17 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1004 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 30.8N 83.0W AT 09/0900Z AT 09/0600Z CENTER WAS LOCATED NEAR 30.5N 83.9W FORECAST VALID 09/1800Z 31.9N 80.0W...OVER WATER MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 10/0600Z 33.0N 75.8W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 10/1800Z 33.9N 72.0W MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 11/0600Z 34.4N 69.5W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 11/1800Z 34.8N 67.5W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 12/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 30.8N 83.0W INTERMEDIATE PUBLIC ADVISORY...WTNT33 KNHC/MIATCPAT3...AT 09/1200Z NEXT ADVISORY AT 09/1500Z $$ FORECASTER BROWN

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Hurricane Larry Forecast Discussion Number 34

2021-09-09 04:58:23| National Hurricane Center (Atlantic)

Issued at 1100 PM AST Wed Sep 08 2021 000 WTNT42 KNHC 090258 TCDAT2 Hurricane Larry Discussion Number 34 NWS National Hurricane Center Miami FL AL122021 1100 PM AST Wed Sep 08 2021 The infrared satellite presentation of Larry this evening is giving the false impression of a well-organized hurricane, with a ring of colder cloud tops (-65 to -70 C) and a warm spot within. However, we are fortunate to have in-situ data provided by an Air Force Reconnaissance Hurricane Hunter mission investigating Larry this evening. Their observations show that Larry's center is actually southwest of the warm spot seen on satellite. In fact, the plane was unable to identify an eye with Larry, and the highest flight-level and SFMR winds were found nearly 80 nautical miles away from the center. Moreover, there remains a large discrepancy between the peak 700-mb flight level winds (108-kt) versus the much lower SFMR peak values (67-kt). This suggests that the 90 percent reduction factor that is typically applied to 700-mb flight level winds in the eyewall may not be appropriate for this hurricane given its very large radius of maximum winds more associated with weaker outer convection. Given these factors, the latest NHC initial intensity has been lowered to 85 kt for this advisory. This intensity is also a good compromise between the SAB and TAFB subjective Dvorak estimates. The hurricane's heading is still off to the northwest with the latest motion at 330/14 kt. The track forecast philosophy has not changed much for the last few days, with Larry moving around the western periphery of a deep-layer subtropical anticyclone over the central Atlantic. The hurricane should make its closest approach to the east of Bermuda tomorrow as it gradually turns north-northwest and north. After that, the hurricane will begin to dramatically accelerate to the northeast as Larry is picked up by a deep-layer trough moving offshore of the eastern United States. The latest forecast track is quite similar to the previous one, and takes Larry across the southeast portion of Newfoundland in 48-60 hours. The official forecast remains close to the tightly clustered track guidance consensus. The current structure of Larry appears to be somewhat tilted with height, with the low-level center identified by recon located to the southwest of the apparent center on IR satellite. While the shear as diagnosed by SHIPS appears to be lower, it appears dry air has significantly disrupted Larry's inner core structure, to the point that it likely will be unable to take advantage of the more favorable conditions. The latest NHC intensity forecast is lower than the previous one, owing to the lower initial intensity, but begins to show more pronounced weakening after 24 hours when the hurricane will accelerate poleward of the northern wall of the Gulf Stream. However, Larry is still forecast to be a hurricane as it passes near or over Newfoundland, though likely beginning to undergo extratropical transition. The models continue to maintain Larry as a large formidable cyclone after extratropical transition is complete while it moves into the far north Atlantic east of Greenland. This cyclone will eventually merge with another extratropical cyclone by the end of the forecast period. Key Messages: 1. Large swells generated by Larry will continue to affect the Leeward Islands, portions of the Greater Antilles, the Bahamas, Bermuda, and the east coast of the United States and Atlantic Canada 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 expected there on Thursday, along with a risk of coastal flooding. A Tropical Storm Warning 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 undergoes transition to a hurricane-force post-tropical cyclone. There is an increasing risk of impacts from high winds, rainfall, and storm surge in portions of Newfoundland, and interests there should monitor updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 09/0300Z 29.7N 60.3W 85 KT 100 MPH 12H 09/1200Z 31.5N 61.5W 85 KT 100 MPH 24H 10/0000Z 34.9N 62.3W 85 KT 100 MPH 36H 10/1200Z 39.3N 60.8W 80 KT 90 MPH 48H 11/0000Z 45.2N 55.8W 75 KT 85 MPH 60H 11/1200Z 51.6N 48.2W 70 KT 80 MPH...POST-TROP/EXTRATROP 72H 12/0000Z 57.4N 41.6W 65 KT 75 MPH...POST-TROP/EXTRATROP 96H 13/0000Z 63.8N 35.6W 55 KT 65 MPH...POST-TROP/EXTRATROP 120H 14/0000Z...DISSIPATED $$ Forecaster Papin

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Hurricane Larry Forecast Advisory Number 34

2021-09-09 04:52:54| National Hurricane Center (Atlantic)

Issued at 0300 UTC THU SEP 09 2021 000 WTNT22 KNHC 090252 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 34 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 0300 UTC THU SEP 09 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * BERMUDA A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS. INTERESTS IN SOUTHEASTERN NEWFOUNDLAND SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. HURRICANE CENTER LOCATED NEAR 29.7N 60.3W AT 09/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 330 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 969 MB MAX SUSTAINED WINDS 85 KT WITH GUSTS TO 105 KT. 64 KT....... 80NE 50SE 40SW 50NW. 50 KT.......120NE 100SE 70SW 90NW. 34 KT.......210NE 210SE 150SW 150NW. 12 FT SEAS..460NE 290SE 270SW 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 29.7N 60.3W AT 09/0300Z AT 09/0000Z CENTER WAS LOCATED NEAR 29.1N 59.9W FORECAST VALID 09/1200Z 31.5N 61.5W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 80NE 60SE 50SW 50NW. 50 KT...110NE 100SE 70SW 80NW. 34 KT...200NE 200SE 140SW 140NW. FORECAST VALID 10/0000Z 34.9N 62.3W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 70NE 50SE 40SW 50NW. 50 KT...110NE 110SE 70SW 80NW. 34 KT...190NE 190SE 130SW 130NW. FORECAST VALID 10/1200Z 39.3N 60.8W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 60NE 70SE 50SW 40NW. 50 KT...110NE 120SE 90SW 70NW. 34 KT...200NE 210SE 160SW 110NW. FORECAST VALID 11/0000Z 45.2N 55.8W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 50NE 70SE 40SW 30NW. 50 KT...100NE 120SE 100SW 70NW. 34 KT...190NE 230SE 210SW 120NW. FORECAST VALID 11/1200Z 51.6N 48.2W...POST-TROP/EXTRATROP MAX WIND 70 KT...GUSTS 85 KT. 50 KT... 80NE 110SE 80SW 60NW. 34 KT...250NE 250SE 220SW 110NW. FORECAST VALID 12/0000Z 57.4N 41.6W...POST-TROP/EXTRATROP MAX WIND 65 KT...GUSTS 80 KT. 50 KT...130NE 140SE 80SW 60NW. 34 KT...300NE 280SE 200SW 170NW. 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 13/0000Z 63.8N 35.6W...POST-TROP/EXTRATROP MAX WIND 55 KT...GUSTS 65 KT. OUTLOOK VALID 14/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 29.7N 60.3W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 09/0600Z NEXT ADVISORY AT 09/0900Z $$ FORECASTER PAPIN

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Tropical Storm Mindy Forecast Discussion Number 2

2021-09-09 04:46:54| National Hurricane Center (Atlantic)

Issued at 1100 PM EDT Wed Sep 08 2021 000 WTNT43 KNHC 090246 TCDAT3 Tropical Storm Mindy Discussion Number 2 NWS National Hurricane Center Miami FL AL132021 1100 PM EDT Wed Sep 08 2021 Doppler radar data and surface observations indicate that the center of Mindy made landfall over St. Vincent Island, Florida, near 0115 UTC. Since that time, the center has been moving along the shoreline of Apalachee Bay. The intensity is held at 40 kt based on continuity from earlier buoy data and a 43-kt wind at an elevated tower south of Apalachicola. The central pressure has been lowered to 1002 mb based on surface obs from the Apalachicola area. It should be noted that while Mindy is not well organized in satellite imagery, but it has a good radar presentation. The initial motion is 055/17. A general east-northeastward motion should continue for the next 24 h or so as Mindy moves along the southern edge of a deep-layer mid-latitude trough moving across the eastern United States. After that, a decrease in forward speed and a more eastward motion are expected as the aforementioned trough moves away from Mindy and the cyclone becomes vertically shallow. The forecast track keeps the center along the Gulf coast for a few more hours, followed by a motion across northern Florida and southeastern Georgia into the Atlantic. The new forecast track is a little faster than the previous forecast. Little change in strength is likely during the next few hours while the center of Mindy straddles the coast. Weakening should occur as the center moves farther inland later tonight, aided by an increase in westerly vertical wind shear. By the time the cyclone reaches the Atlantic, the shear should be strong enough to make the system continue to weaken. The new intensity forecast is a little stronger than the previous forecast during the first 12 h, then is similar to the previous forecast in calling for the cyclone to dissipate after 72 h. Key Messages: 1. Tropical Storm Mindy is expected to produce heavy rainfall from the Florida Panhandle into southern portions of Georgia and South Carolina through Thursday morning. This rainfall may produce isolated to scattered flash, urban, and small stream flooding. 2. Tropical storm conditions are expected through tonight in portions of the Florida Panhandle where a Tropical Storm Warning is in effect. Tropical storm conditions are also possible across portions of the northern Florida Peninsula and southeastern Georgia near the center of Mindy. FORECAST POSITIONS AND MAX WINDS INIT 09/0300Z 29.9N 84.5W 40 KT 45 MPH 12H 09/1200Z 31.0N 81.8W 35 KT 40 MPH...INLAND 24H 10/0000Z 32.2N 77.7W 30 KT 35 MPH...OVER WATER 36H 10/1200Z 33.1N 73.7W 30 KT 35 MPH 48H 11/0000Z 33.7N 70.7W 30 KT 35 MPH 60H 11/1200Z 34.1N 68.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 12/0000Z 34.3N 66.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 13/0000Z...DISSIPATED $$ Forecaster Beven

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