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Tropical Storm Paulette Forecast Discussion Number 14
2020-09-10 10:37:35| National Hurricane Center (Atlantic)
Issued at 500 AM AST Thu Sep 10 2020 000 WTNT42 KNHC 100837 TCDAT2 Tropical Storm Paulette Discussion Number 14 NWS National Hurricane Center Miami FL AL172020 500 AM AST Thu Sep 10 2020 Although Paulette's center of circulation has separated farther south from the cloud mass during the past several hours, the cyclone is still producing an area of deep convection consisting of -79C cold cloud tops. Earlier scatterometer data indicated surface winds of 45-50 kt in this region of coldest cloud tops, so it's reasonable to think that those winds are still present. Therefore, the initial intensity is held at 50 kt for this advisory. Both the ECMWF and FV3 SHIPS intensity models show the shear magnitude increasing to 35-40 kt today. As a result, Paulette is expected to begin weakening by this evening. Over the weekend, however, the shear is forecast to decrease gradually and shift from the southeast and become a bit more diffluent, which should allow for reintensification. Several of the skilled intensity guidance, including the aforementioned SHIPS, and the consensus models, HCCA and IVCN, now show Paulette as a hurricane in 4 days, or sooner (COAMPS-TC). The official intensity forecast is once again adjusted upward, and lies between the HCCA (a little higher) and the Decay SHIPS intensity guidance. The initial motion is estimated to be west-northwestward, or 290/9 kt and Paulette should continue in this general motion through Friday as a mid-tropospheric ridge temporarily builds over the central Atlantic in response to a mid- to upper-level trough, extending southwestward from the Azores Islands, weakening and lifting northeastward. By Saturday morning, a break in the aforementioned ridge develops due to a combination of mid- to upper-level low situated to the northwest of the cyclone and a mid-latitude shortwave trough moving off of the northeast U.S. This change in the synoptic steering pattern should cause the tropical cyclone to turn toward the northwest with an increase in forward speed. The NHC track forecast is close to the previous advisory, but a little faster beyond 48 hours, and is shifted to the left, closer to the HCCA and TVCN consensus models at days 4 and 5. FORECAST POSITIONS AND MAX WINDS INIT 10/0900Z 20.9N 49.0W 50 KT 60 MPH 12H 10/1800Z 21.3N 50.4W 50 KT 60 MPH 24H 11/0600Z 21.8N 52.4W 45 KT 50 MPH 36H 11/1800Z 22.8N 54.2W 40 KT 45 MPH 48H 12/0600Z 24.1N 55.9W 40 KT 45 MPH 60H 12/1800Z 25.7N 57.5W 45 KT 50 MPH 72H 13/0600Z 27.1N 59.4W 50 KT 60 MPH 96H 14/0600Z 29.7N 63.7W 65 KT 75 MPH 120H 15/0600Z 32.0N 64.9W 75 KT 85 MPH $$ Forecaster Roberts
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Summary for Tropical Storm Paulette (AT2/AL172020)
2020-09-10 10:36:41| National Hurricane Center (Atlantic)
...PAULETTE EXPECTED TO WEAKEN SOON... ...RESTRENGTHENING FORECAST OVER THE WEEKEND... As of 5:00 AM AST Thu Sep 10 the center of Paulette was located near 20.9, -49.0 with movement WNW at 10 mph. The minimum central pressure was 996 mb with maximum sustained winds of about 60 mph.
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Tropical Storm Paulette Public Advisory Number 14
2020-09-10 10:36:41| National Hurricane Center (Atlantic)
Issued at 500 AM AST Thu Sep 10 2020 000 WTNT32 KNHC 100836 TCPAT2 BULLETIN Tropical Storm Paulette Advisory Number 14 NWS National Hurricane Center Miami FL AL172020 500 AM AST Thu Sep 10 2020 ...PAULETTE EXPECTED TO WEAKEN SOON... ...RESTRENGTHENING FORECAST OVER THE WEEKEND... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...20.9N 49.0W ABOUT 935 MI...1505 KM ENE OF THE NORTHERN LEEWARD ISLANDS ABOUT 1250 MI...2015 KM SE OF BERMUDA MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. Interests in Bermuda should monitor the progress of this system. Please consult products from your local weather office. DISCUSSION AND OUTLOOK ---------------------- At 500 AM AST (0900 UTC), the center of Tropical Storm Paulette was located near latitude 20.9 North, longitude 49.0 West. Paulette is moving toward the west-northwest near 10 mph (17 km/h) and this general motion is expected to continue through Friday. A northwestward motion should begin Friday evening and continue into the weekend. Maximum sustained winds are near 60 mph (95 km/h) with higher gusts. Some weakening is forecast during the next couple of days. Restrengthening is expected to commence over the weekend. Tropical-storm-force winds extend outward up to 205 miles (335 km) from the center. The estimated minimum central pressure is 996 mb (29.42 inches). HAZARDS AFFECTING LAND ---------------------- SURF: Swells generated by Paulette are expected to reach portions of the Leeward Islands Thursday night and Friday and will continue to spread westward to portions of the Greater Antilles, Bahamas, and Bermuda into the weekend. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 AM AST. $$ Forecaster Roberts
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Tropical Storm Paulette Wind Speed Probabilities Number 14
2020-09-10 10:36:41| National Hurricane Center (Atlantic)
Issued at 0900 UTC THU SEP 10 2020 000 FONT12 KNHC 100836 PWSAT2 TROPICAL STORM PAULETTE WIND SPEED PROBABILITIES NUMBER 14 NWS NATIONAL HURRICANE CENTER MIAMI FL AL172020 0900 UTC THU SEP 10 2020 AT 0900Z THE CENTER OF TROPICAL STORM PAULETTE WAS LOCATED NEAR LATITUDE 20.9 NORTH...LONGITUDE 49.0 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 50 KTS...60 MPH...95 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 06Z THU 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 06Z THU 18Z THU 06Z FRI 18Z FRI 06Z SAT 06Z SUN 06Z MON PERIODS TO TO TO TO TO TO TO 18Z THU 06Z FRI 18Z FRI 06Z SAT 06Z SUN 06Z MON 06Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT BERMUDA 34 X X( X) X( X) X( X) 1( 1) 17(18) 25(43) BERMUDA 50 X X( X) X( X) X( X) X( X) 4( 4) 12(16) BERMUDA 64 X X( X) X( X) X( X) X( X) 1( 1) 6( 7) $$ FORECASTER ROBERTS
Tropical Storm Paulette Forecast Advisory Number 14
2020-09-10 10:35:40| National Hurricane Center (Atlantic)
Issued at 0900 UTC THU SEP 10 2020 000 WTNT22 KNHC 100835 TCMAT2 TROPICAL STORM PAULETTE FORECAST/ADVISORY NUMBER 14 NWS NATIONAL HURRICANE CENTER MIAMI FL AL172020 0900 UTC THU SEP 10 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 20.9N 49.0W AT 10/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 9 KT ESTIMATED MINIMUM CENTRAL PRESSURE 996 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 90NE 0SE 0SW 60NW. 34 KT.......180NE 60SE 60SW 170NW. 12 FT SEAS..300NE 90SE 210SW 330NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 20.9N 49.0W AT 10/0900Z AT 10/0600Z CENTER WAS LOCATED NEAR 20.8N 48.5W FORECAST VALID 10/1800Z 21.3N 50.4W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 60NE 0SE 0SW 40NW. 34 KT...150NE 50SE 30SW 140NW. FORECAST VALID 11/0600Z 21.8N 52.4W MAX WIND 45 KT...GUSTS 55 KT. 34 KT...130NE 40SE 0SW 120NW. FORECAST VALID 11/1800Z 22.8N 54.2W MAX WIND 40 KT...GUSTS 50 KT. 34 KT...120NE 30SE 0SW 100NW. FORECAST VALID 12/0600Z 24.1N 55.9W MAX WIND 40 KT...GUSTS 50 KT. 34 KT...120NE 30SE 0SW 100NW. FORECAST VALID 12/1800Z 25.7N 57.5W MAX WIND 45 KT...GUSTS 55 KT. 34 KT...120NE 50SE 20SW 100NW. FORECAST VALID 13/0600Z 27.1N 59.4W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 0SE 0SW 30NW. 34 KT...120NE 50SE 40SW 100NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 14/0600Z 29.7N 63.7W MAX WIND 65 KT...GUSTS 80 KT. OUTLOOK VALID 15/0600Z 32.0N 64.9W MAX WIND 75 KT...GUSTS 90 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 20.9N 49.0W NEXT ADVISORY AT 10/1500Z $$ FORECASTER ROBERTS
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