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Hurricane Larry Forecast Discussion Number 36

2021-09-09 17:00:37| National Hurricane Center (Atlantic)

Issued at 1100 AM AST Thu Sep 09 2021 000 WTNT42 KNHC 091500 TCDAT2 Hurricane Larry Discussion Number 36 NWS National Hurricane Center Miami FL AL122021 1100 AM AST Thu Sep 09 2021 Larry continues to feature a banding-type eye on satellite images, and the eye is clearly evident on the Bermuda radar. Satellite and radar data also show a moat-like area of low precipitation between the eyewall and a large band of convection farther removed from the center. This outer band is expected to affect Bermuda or the waters just east of the island over the next several hours. Observations from an Air Force Hurricane Hunter aircraft indicate that the central pressure has changed little since yesterday. Flight-level winds from the aircraft were as high as 95 kt, but the peak SFMR-observed surface winds were only 69 kt. This again indicates that in this case the strong winds aloft are not being transported to the surface as effectively as in a typical hurricane at lower latitudes. Blending these data results in an intensity estimate of 80 kt for this advisory. This is just a little higher than the latest subjective Dvorak estimates from TAFB and SAB. The hurricane is gradually turning to the right and the initial motion is 340/14 kt. Larry is currently moving around the western side of a deep-layer subtropical anticyclone over the central Atlantic, and is passing east of Bermuda. The flow on the east side of a strong mid-level trough moving from the northeastern United States to Atlantic Canada will cause Larry to turn toward the northeast and accelerate in 24 to 48 hours. Larry will move near or over southeastern Newfoundland in 36 to 48 hours, and then move over the far north Atlantic around the end of the forecast period. There is very little change to the NHC track forecast from the previous advisory, which remains close to the various consensus model solutions. Larry is likely remain over warm waters with low shear for another 24 hours or so. Thus the system will probably maintain much of its intensity into Friday. By Friday night and over the weekend, cooler SSTs and increasing shear should cause weakening. However, baroclinic forcing associated with the trough to the west of the hurricane could slow the weakening process. The official intensity forecast keeps Larry at hurricane-force through 48 hours even as it undergoes extratropical transition. In 3-4 days, the global models show Larry merging with another large extratropical cyclone over the north Atlantic. 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 later today, and tropical storm conditions are expected there today, along with a risk of coastal flooding. 3. Larry is forecast to move near or over portions of southeastern Newfoundland Friday night or early Saturday morning as it undergoes transition to a hurricane-force post-tropical cyclone. Hurricane conditions are storm surge are possible in portions of southeastern Newfoundland where a hurricane watch is in effect. Interests there should monitor updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 09/1500Z 32.0N 61.6W 80 KT 90 MPH 12H 10/0000Z 34.5N 62.2W 80 KT 90 MPH 24H 10/1200Z 39.0N 60.8W 80 KT 90 MPH 36H 11/0000Z 44.8N 56.1W 75 KT 85 MPH 48H 11/1200Z 51.3N 49.1W 65 KT 75 MPH...POST-TROP/EXTRATROP 60H 12/0000Z 57.0N 43.5W 60 KT 70 MPH...POST-TROP/EXTRATROP 72H 12/1200Z 61.0N 40.0W 55 KT 65 MPH...POST-TROP/EXTRATROP 96H 13/1200Z...MERGED $$ Forecaster Pasch

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Hurricane Larry Forecast Advisory Number 36

2021-09-09 16:54:06| National Hurricane Center (Atlantic)

Issued at 1500 UTC THU SEP 09 2021 420 WTNT22 KNHC 091454 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 36 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 1500 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 32.0N 61.6W AT 09/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 340 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 966 MB MAX SUSTAINED WINDS 80 KT WITH GUSTS TO 100 KT. 64 KT....... 80NE 60SE 30SW 50NW. 50 KT.......110NE 110SE 70SW 90NW. 34 KT.......190NE 190SE 140SW 140NW. 12 FT SEAS..400NE 320SE 270SW 270NW. 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 32.0N 61.6W AT 09/1500Z AT 09/1200Z CENTER WAS LOCATED NEAR 31.3N 61.5W FORECAST VALID 10/0000Z 34.5N 62.2W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 80NE 60SE 30SW 50NW. 50 KT...110NE 110SE 70SW 90NW. 34 KT...190NE 190SE 140SW 140NW. FORECAST VALID 10/1200Z 39.0N 60.8W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 70NE 50SE 40SW 50NW. 50 KT...110NE 110SE 70SW 80NW. 34 KT...190NE 190SE 150SW 130NW. FORECAST VALID 11/0000Z 44.8N 56.1W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 60NE 70SE 50SW 40NW. 50 KT...110NE 120SE 90SW 70NW. 34 KT...200NE 210SE 160SW 110NW. FORECAST VALID 11/1200Z 51.3N 49.1W...POST-TROP/EXTRATROP MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 50NE 70SE 40SW 30NW. 50 KT...110NE 120SE 100SW 70NW. 34 KT...200NE 230SE 210SW 110NW. FORECAST VALID 12/0000Z 57.0N 43.5W...POST-TROP/EXTRATROP MAX WIND 60 KT...GUSTS 75 KT. 50 KT...150NE 120SE 100SW 70NW. 34 KT...250NE 250SE 220SW 110NW. FORECAST VALID 12/1200Z 61.0N 40.0W...POST-TROP/EXTRATROP MAX WIND 55 KT...GUSTS 65 KT. 50 KT...150NE 140SE 100SW 70NW. 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 13/1200Z...ABSORBED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 32.0N 61.6W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 09/1800Z NEXT ADVISORY AT 09/2100Z $$ FORECASTER PASCH

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Tropical Depression Mindy Forecast Discussion Number 4

2021-09-09 16:52:11| National Hurricane Center (Atlantic)

Issued at 1100 AM EDT Thu Sep 09 2021 000 WTNT43 KNHC 091452 TCDAT3 Tropical Depression Mindy Discussion Number 4 NWS National Hurricane Center Miami FL AL132021 1100 AM EDT Thu Sep 09 2021 Doppler radar data and surface observations show that the center of Mindy has recently moved offshore the coast of Georgia. Buoy 41008 located off the Georgia coast recently recorded 1-min sustained winds of 29 kt with gusts as high as 33 kt. Thus, 30 kt is maintained as the intensity for this advisory. Mindy is located in an environment of strong south to southwesterly vertical wind shear. Over the next 24 h, the shear is expected to become even stronger. The strong shear should prevent restrengthening and is likely to strip away any remaining convection by Friday or Friday night. Mindy is forecast to become post-tropical Friday evening. Most of the global models suggest that the cyclone will open up into a trough in 36-48 h, but it is possible this could happen sooner, as surface observations already show that easterly winds on the north side have become quite weak. The NHC forecast calls for dissipation Friday night, which is sooner than the previous advisory. Mindy continues moving quickly to the east-northeast or 065/18 kt. There has been no change to the track forecast philosophy. Mindy is forecast to continue moving east-northeastward at a similar speed for the next 24 h near the southern portion of a deep-layer trough moving across the eastern United States. Once the trough begins to lift northeastward, Mindy should slow down a little on Friday. The main adjustment to the NHC track is to show a slightly faster motion toward the east-northeast at the 24-36 h points. Key Messages: 1. Mindy will produce locally heavy rainfall across portions of coastal South Carolina through early this afternoon. This rainfall may produce isolated to scattered flash, urban, and small stream flooding. FORECAST POSITIONS AND MAX WINDS INIT 09/1500Z 31.5N 80.7W 30 KT 35 MPH 12H 10/0000Z 32.5N 77.5W 30 KT 35 MPH 24H 10/1200Z 33.6N 73.4W 30 KT 35 MPH 36H 11/0000Z 34.3N 70.3W 25 KT 30 MPH...POST-TROPICAL 48H 11/1200Z...DISSIPATED $$ Forecaster D. Zelinsky/Hagen

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Tropical Depression Mindy Forecast Advisory Number 4

2021-09-09 16:51:39| National Hurricane Center (Atlantic)

Issued at 1500 UTC THU SEP 09 2021 000 WTNT23 KNHC 091451 TCMAT3 TROPICAL DEPRESSION MINDY FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL132021 1500 UTC THU SEP 09 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 31.5N 80.7W AT 09/1500Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE EAST-NORTHEAST OR 65 DEGREES AT 18 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 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 31.5N 80.7W AT 09/1500Z AT 09/1200Z CENTER WAS LOCATED NEAR 31.2N 81.8W FORECAST VALID 10/0000Z 32.5N 77.5W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 10/1200Z 33.6N 73.4W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 11/0000Z 34.3N 70.3W...POST-TROPICAL MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 11/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 31.5N 80.7W NEXT ADVISORY AT 09/2100Z $$ FORECASTER D. ZELINSKY/HAGEN

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Hurricane Olaf Forecast Discussion Number 8

2021-09-09 16:51:10| National Hurricane Center (East Pacific)

Issued at 900 AM MDT Thu Sep 09 2021 000 WTPZ45 KNHC 091451 TCDEP5 Hurricane Olaf Discussion Number 8 NWS National Hurricane Center Miami FL EP152021 900 AM MDT Thu Sep 09 2021 Recent microwave imagery shows that Olaf's structure has improved considerably during the past 6 hours, and it now has well-defined eye. The eye is also now evident in radar imagery from Cabo San Lucas. Although an eye is not yet evident in infrared or visible imagery, satellite intensity estimates had increased and supported an intensity of 60-65 kt at 1200 UTC. Given the continued impressive satellite appearance since then, the estimated intensity is 65 kt for this advisory, making Olaf a hurricane. Olaf has a microwave ring structure that is known to indicate intensification in the short term. The wind shear that previously affected the hurricane seems to have lessened and the environment should also support further strengthening today. The hurricane is therefore forecast to quickly intensify during the next 12 h or so while it approaches the southern tip of the Baja California peninsula. After that, interaction with land and cold sea surface temperatures should cause the cyclone to quickly weaken over the weekend. Olaf is forecast to become post-tropical in about 60 h as it moves farther away from land. The NHC intensity forecast is above the previous advisory, and is above most of the guidance through 24 h. Beyond that, there have been only slight adjustments to the official intensity forecast, which is based on the multi- model consensus. The track forecast has shifted closer to the southern Baja California peninsula. In line with the intensity forecast, the NHC forecast now slightly favors the stronger GFS and regional hurricane models, compared to the weaker ECMWF, but is still near the HCCA and TVCN consensus aids. Olaf is moving north-northeast but should turn northwestward later today, steered by a mid-level ridge centered over the western United States. The models with a stronger hurricane show Olaf turning slightly slower, and bring the center very near or even over Baja California Sur tonight. As Olaf weakens it should begin to be steered by lower-level flow, which will cause it to eventually turn westward and then southwestward as it moves away from land early next week. Key Messages: 1. Olaf is forecast to pass very near or over the southern portion of Baja California Sur tonight and Friday, and hurricane conditions are likely within the hurricane warning area tonight. Tropical storm conditions are expected to begin within the hurricane warning area this afternoon, and preparations should be rushed to completion. 2. Heavy rains associated with Olaf are expected across portions of southern Baja California Sur through Friday. This will pose a threat of significant and life-threatening flash flooding and mudslides. FORECAST POSITIONS AND MAX WINDS INIT 09/1500Z 21.2N 108.3W 65 KT 75 MPH 12H 10/0000Z 22.2N 109.2W 75 KT 85 MPH 24H 10/1200Z 23.3N 110.7W 65 KT 75 MPH 36H 11/0000Z 24.0N 112.1W 60 KT 70 MPH 48H 11/1200Z 24.1N 113.5W 45 KT 50 MPH 60H 12/0000Z 23.8N 114.7W 35 KT 40 MPH...POST-TROPICAL 72H 12/1200Z 23.2N 116.0W 30 KT 35 MPH...POST-TROP/REMNT LOW 96H 13/1200Z 21.5N 119.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 14/1200Z 21.0N 122.0W 20 KT 25 MPH...POST-TROP/REMNT LOW $$ Forecaster D. Zelinsky

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