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Tropical Storm Arthur Forecast Discussion Number 4
2020-05-17 16:45:07| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Sun May 17 2020 000 WTNT41 KNHC 171445 TCDAT1 Tropical Storm Arthur Discussion Number 4 NWS National Hurricane Center Miami FL AL012020 1100 AM EDT Sun May 17 2020 Visible satellite imagery reveals a couple of convective bands over the eastern semicircle of the tropical storm, but convection is sparse over the western portion of the circulation. The latest reports from an Air Force reconnaissance aircraft show peak 925-mb flight-level winds of 48 kt, and believable SFMR winds of 35-40 kt. On this basis, the initial wind speed has been increased to 40 kt. The plane has reported a minimum pressure of 1002-1003 mb, which is down a few millibars from the previous flight. Arthur has a little more than 24 hours in which to gradually strengthen. The storm will be traversing the relatively warm waters of the Gulf stream, and the vertical shear is forecast to remain low through early Monday. After that time, increasing shear and cooler sea surface temperatures should put a halt to the tropical cyclone strengthening processes. Baroclinic forcing is likely to help the post-tropical cyclone maintain its strengthen through extratropical transition. Later in the forecast period, the global model guidance shows weakening as the frontal gradients decrease. The storm is moving north-northeastward or 015/8 kt. Arthur is expected to begin moving a little faster later today and tonight as a mid-level trough approaches the eastern United States. Later in the forecast period, the cyclone should turn eastward within the westerly steering flow. Although the dynamical models are in agreement on the overall scenario, there remains some spread as to how close the center of Arthur will track to the North Carolina Outer Bands. The GFS and HWRF remain along the western side of the guidance while the ECMWF and UKMET bracket the eastern side. The NHC track lies near the model consensus and little change was required to the previous track through 36-48 hours. After that time, the track guidance spread increases with the ECMWF showing a much faster east-southeastward motion than the GFS. The NHC forecast remains near the consensus after 48 hours, but there is less confidence in that portion of the track prediction. Key Messages: 1. A Tropical Storm Warning is in effect for a portion of the North Carolina coast. Tropical-storm-force winds and heavy rains are expected there on Monday. 2. Dangerous coastal surf conditions and rip currents are expected to spread northward along the southeast U.S. coast to the mid-Atlantic states during the next couple of days. See products from your local National Weather Service Forecast Office for more details. FORECAST POSITIONS AND MAX WINDS INIT 17/1500Z 30.5N 77.4W 40 KT 45 MPH 12H 18/0000Z 32.0N 76.8W 45 KT 50 MPH 24H 18/1200Z 34.3N 75.5W 50 KT 60 MPH 36H 19/0000Z 36.4N 73.2W 50 KT 60 MPH 48H 19/1200Z 37.3N 70.4W 50 KT 60 MPH...POST-TROP/EXTRATROP 60H 20/0000Z 37.1N 68.2W 50 KT 60 MPH...POST-TROP/EXTRATROP 72H 20/1200Z 36.5N 66.5W 45 KT 50 MPH...POST-TROP/EXTRATROP 96H 21/1200Z 35.5N 64.5W 35 KT 40 MPH...POST-TROP/EXTRATROP 120H 22/1200Z...DISSIPATED $$ Forecaster Brown
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Tropical Storm Arthur Forecast Advisory Number 4
2020-05-17 16:44:04| National Hurricane Center (Atlantic)
Issued at 1500 UTC SUN MAY 17 2020 343 WTNT21 KNHC 171444 TCMAT1 TROPICAL STORM ARTHUR FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL012020 1500 UTC SUN MAY 17 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * SURF CITY TO DUCK NC * PAMLICO AND ALBEMARLE SOUNDS A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA...IN THIS CASE WITHIN THE NEXT 24 HOURS. TROPICAL STORM CENTER LOCATED NEAR 30.5N 77.4W AT 17/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 15 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT.......100NE 100SE 0SW 0NW. 12 FT SEAS..120NE 90SE 0SW 105NW. 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 30.5N 77.4W AT 17/1500Z AT 17/1200Z CENTER WAS LOCATED NEAR 30.3N 77.4W FORECAST VALID 18/0000Z 32.0N 76.8W MAX WIND 45 KT...GUSTS 55 KT. 34 KT...110NE 110SE 0SW 0NW. FORECAST VALID 18/1200Z 34.3N 75.5W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 0NE 40SE 0SW 0NW. 34 KT...110NE 110SE 0SW 50NW. FORECAST VALID 19/0000Z 36.4N 73.2W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 0NE 40SE 0SW 0NW. 34 KT...120NE 120SE 40SW 50NW. FORECAST VALID 19/1200Z 37.3N 70.4W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 40SE 0SW 0NW. 34 KT...150NE 120SE 70SW 90NW. FORECAST VALID 20/0000Z 37.1N 68.2W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 40SE 0SW 0NW. 34 KT...180NE 120SE 70SW 120NW. FORECAST VALID 20/1200Z 36.5N 66.5W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. 34 KT...180NE 90SE 70SW 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 21/1200Z 35.5N 64.5W...POST-TROP/EXTRATROP MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 22/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 30.5N 77.4W INTERMEDIATE PUBLIC ADVISORY...WTNT31 KNHC/MIATCPAT1...AT 17/1800Z NEXT ADVISORY AT 17/2100Z $$ FORECASTER BROWN
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Tropical Storm Arthur Forecast Discussion Number 3
2020-05-17 10:48:37| National Hurricane Center (Atlantic)
Issued at 500 AM EDT Sun May 17 2020 000 WTNT41 KNHC 170848 TCDAT1 Tropical Storm Arthur Discussion Number 3 NWS National Hurricane Center Miami FL AL012020 500 AM EDT Sun May 17 2020 Arthur has not changed much in organization overnight. The storm features a large curved convective band over the eastern semicircle of the circulation, and the low-level center appears to be exposed to the west of that band. The intensity is held at 35 kt in agreement with a subjective Dvorak estimate from TAFB and ADT estimates from UW-CIMSS. An Air Force Hurricane Hunter aircraft is scheduled to investigate the cyclone around 12Z which should provide a good estimate of Arthur's intensity. Although Arthur will be crossing back over the Gulf Stream tonight and Monday, vertical shear is forecast to steadily increase during that time. With these counteracting influences on intensity change, only slight strengthening is anticipated during the next 24-36 hours. The official forecast is close to the model consensus and is similar to the previous one. In 2-3 days, some strengthening due to baroclinic processes is possible, since the global models depict extratropical transition around that time. Later in the forecast period, the dynamical guidance shows weakening as the frontal gradients decrease. The storm has been moving a little to the left of the previous estimates and the motion is now around 015/8 kt. An approaching mid-level trough over the eastern U.S. should cause the cyclone to accelerate northeastward during the next 48 hours or so. Later in the forecast period, Arthur or its post-tropical remnants should turn eastward within a general westerly flow field. There has been a bit of a westward shift in much of the track guidance for the next 1-2 days, which has necessitated a leftward adjustment of the official forecast track. Since the new NHC forecast is now closer to the North Carolina Outer Banks, the Tropical Storm Watch has been changed to a Tropical Storm Warning for that area. Key Messages: 1. A Tropical Storm Warning is now in effect for a portion of the North Carolina coast. Tropical-storm-force winds and heavy rains are expected there on Monday. 2. Dangerous coastal surf conditions and rip currents are expected to spread northward from Florida to the mid-Atlantic states during the next few days. See products from your local National Weather Service Forecast Office for more details. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 30.0N 77.6W 35 KT 40 MPH 12H 17/1800Z 31.2N 77.2W 40 KT 45 MPH 24H 18/0600Z 33.2N 76.4W 45 KT 50 MPH 36H 18/1800Z 35.5N 74.7W 45 KT 50 MPH 48H 19/0600Z 36.9N 72.0W 50 KT 60 MPH 60H 19/1800Z 37.3N 69.4W 50 KT 60 MPH...POST-TROP/EXTRATROP 72H 20/0600Z 37.0N 67.0W 50 KT 60 MPH...POST-TROP/EXTRATROP 96H 21/0600Z 36.0N 66.0W 40 KT 45 MPH...POST-TROP/EXTRATROP 120H 22/0600Z...DISSIPATED $$ Forecaster Pasch
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Tropical Storm Arthur Forecast Advisory Number 3
2020-05-17 10:47:38| National Hurricane Center (Atlantic)
Issued at 0900 UTC SUN MAY 17 2020 000 WTNT21 KNHC 170847 TCMAT1 TROPICAL STORM ARTHUR FORECAST/ADVISORY NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL012020 0900 UTC SUN MAY 17 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE TROPICAL STORM WATCH IS CHANGED TO A TROPICAL STORM WARNING FROM SURF CITY TO DUCK...NORTH CAROLINA...INCLUDING PAMLICO AND ALBERMARLE SOUNDS. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * SURF CITY TO DUCK NC * PAMLICO AND ALBEMARLE SOUNDS A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS. TROPICAL STORM CENTER LOCATED NEAR 30.0N 77.6W AT 17/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 15 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 70NE 70SE 0SW 0NW. 12 FT SEAS..150NE 75SE 0SW 105NW. 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 30.0N 77.6W AT 17/0900Z AT 17/0600Z CENTER WAS LOCATED NEAR 29.7N 77.7W FORECAST VALID 17/1800Z 31.2N 77.2W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 70SE 0SW 0NW. FORECAST VALID 18/0600Z 33.2N 76.4W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 80NE 70SE 0SW 0NW. FORECAST VALID 18/1800Z 35.5N 74.7W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 80NE 70SE 30SW 50NW. FORECAST VALID 19/0600Z 36.9N 72.0W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 30SE 0SW 0NW. 34 KT... 90NE 90SE 50SW 50NW. FORECAST VALID 19/1800Z 37.3N 69.4W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 30SE 0SW 0NW. 34 KT...120NE 100SE 70SW 90NW. FORECAST VALID 20/0600Z 37.0N 67.0W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 50NE 30SE 0SW 0NW. 34 KT...180NE 180SE 90SW 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 21/0600Z 36.0N 66.0W...POST-TROP/EXTRATROP MAX WIND 40 KT...GUSTS 50 KT. OUTLOOK VALID 22/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 30.0N 77.6W INTERMEDIATE PUBLIC ADVISORY...WTNT31 KNHC/MIATCPAT1...AT 17/1200Z NEXT ADVISORY AT 17/1500Z $$ FORECASTER PASCH
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Tropical Storm Arthur Forecast Advisory Number 2
2020-05-17 05:12:00| National Hurricane Center (Atlantic)
Issued at 0300 UTC SUN MAY 17 2020 000 WTNT21 KNHC 170311 CCA TCMAT1 TROPICAL STORM ARTHUR FORECAST/ADVISORY NUMBER 2...CORRECTED NWS NATIONAL HURRICANE CENTER MIAMI FL AL012020 0300 UTC SUN MAY 17 2020 CORRECTED 12-HOUR 34-KT WIND RADII CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * SURF CITY TO DUCK NC * PAMLICO AND ALBEMARLE SOUNDS A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. A TROPICAL STORM WARNING COULD BE REQUIRED FOR PORTIONS OF THE WATCH AREA BY SUNDAY MORNING. TROPICAL STORM CENTER LOCATED NEAR 29.4N 77.7W AT 17/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 30 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 70NE 70SE 0SW 0NW. 12 FT SEAS..150NE 0SE 0SW 150NW. 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 29.4N 77.7W AT 17/0300Z AT 17/0000Z CENTER WAS LOCATED NEAR 28.9N 77.9W FORECAST VALID 17/1200Z 30.5N 77.2W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 70NE 70SE 0SW 0NW. FORECAST VALID 18/0000Z 32.2N 76.4W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 60SE 0SW 0NW. FORECAST VALID 18/1200Z 34.1N 75.2W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 80NE 70SE 30SW 50NW. FORECAST VALID 19/0000Z 36.2N 73.0W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 90NE 80SE 50SW 50NW. FORECAST VALID 19/1200Z 37.5N 70.6W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 30SE 0SW 0NW. 34 KT...120NE 100SE 70SW 90NW. FORECAST VALID 20/0000Z 38.0N 69.1W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 50NE 30SE 0SW 0NW. 34 KT...180NE 180SE 90SW 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 21/0000Z 38.0N 67.6W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. OUTLOOK VALID 22/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 29.4N 77.7W INTERMEDIATE PUBLIC ADVISORY...WTNT31 KNHC/MIATCPAT1...AT 17/0600Z NEXT ADVISORY AT 17/0900Z $$ FORECASTER STEWART
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