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Post-Tropical Cyclone Leslie Forecast Discussion Number 70
2018-10-13 22:37:05| National Hurricane Center (Atlantic)
Issued at 500 PM AST Sat Oct 13 2018 000 WTNT43 KNHC 132036 TCDAT3 Post-Tropical Cyclone Leslie Discussion Number 70 NWS National Hurricane Center Miami FL AL132018 500 PM AST Sat Oct 13 2018 After a total of 70 advisories, long-lived Leslie has become post-tropical just west of the coast of Portugal, finally succumbing to the combination of cool waters, strong vertical wind shear, and interaction with an approaching cold front. The air mass ahead of the cyclone has moistened up in the low levels with Faro, Portugal, reporting a dewpoint of 70F/21C, but the dewpoints across central and northern Portugal ahead of Leslie are only in the low-60F range, which is not indicative of a tropical air mass. Thus, the cyclone is now a powerful post-tropical low pressure system that even has a partial eye noted in the most recent 2000Z Portuguese composite radar imagery. After landfall, rapid weakening is anticipated, and Leslie is forecast to degenerate into a broad low pressure area over or just north of Spain by late Sunday. Leslie is moving quickly toward the northeast or 050/30 kt. Post-tropical Cyclone Leslie should continue in a fast northeastward direction for the next 12-18 hours, making landfall near or just south of Porto, Portugal by 14/0000Z. This forecast motion is consistent with the previous advisory and the latest track model guidance. The meteorological services of Portugal and Spain are handling hazards information for their respective countries via local weather products. This is the last National Hurricane Center (NHC) advisory on this system. Key Messages: 1. Leslie is expected to bring near hurricane-force winds to portions of Portugal later tonight as a powerful post-tropical cyclone. Gale-force winds are also likely to affect portions of northwestern and northern Spain tonight and Sunday. 2. Leslie is expected to produce rainfall amounts of 25 to 75 mm (1 to 3 inches) with isolated amounts as high as 125 mm (5 inches) across portions of Portugal and Spain, which could cause flash flooding. 3. For more information on Leslie, interests in Portugal should refer to products from the Portuguese Institute for Sea and Atmosphere at www.ipma.pt. Interests in Spain should refer to products from the State Meteorological Agency at www.aemet.es. FORECAST POSITIONS AND MAX WINDS INIT 13/2100Z 40.5N 9.5W 60 KT 70 MPH...POST-TROPICAL 12H 14/0600Z 43.0N 4.9W 35 KT 40 MPH...POST-TROPICAL INLAND 24H 14/1800Z...DISSIPATED $$ Forecaster Stewart
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Post-Tropical Cyclone Leslie Wind Speed Probabilities Number 70
2018-10-13 22:36:31| National Hurricane Center (Atlantic)
Issued at 2100 UTC SAT OCT 13 2018 000 FONT13 KNHC 132036 PWSAT3 POST-TROPICAL CYCLONE LESLIE WIND SPEED PROBABILITIES NUMBER 70 NWS NATIONAL HURRICANE CENTER MIAMI FL AL132018 2100 UTC SAT OCT 13 2018 AT 2100Z THE CENTER OF POST-TROPICAL CYCLONE LESLIE WAS LOCATED NEAR LATITUDE 40.5 NORTH...LONGITUDE 9.5 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 60 KTS...70 MPH...110 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 18Z SAT 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 18Z SAT 06Z SUN 18Z SUN 06Z MON 18Z MON 18Z TUE 18Z WED PERIODS TO TO TO TO TO TO TO 06Z SUN 18Z SUN 06Z MON 18Z MON 18Z TUE 18Z WED 18Z THU FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER STEWART
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Summary for Post-Tropical Cyclone Leslie (AT3/AL132018)
2018-10-13 22:36:02| National Hurricane Center (Atlantic)
...DANGEROUS WINDS, SURF, AND HEAVY RAINFALL WILL AFFECT PORTIONS OF PORTUGAL AND SPAIN TONIGHT AND SUNDAY... ...THIS IS THE LAST ADVISORY... As of 5:00 PM AST Sat Oct 13 the center of Leslie was located near 40.5, -9.5 with movement NE at 35 mph. The minimum central pressure was 984 mb with maximum sustained winds of about 70 mph.
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Post-Tropical Cyclone Leslie Public Advisory Number 70
2018-10-13 22:36:02| National Hurricane Center (Atlantic)
Issued at 500 PM AST Sat Oct 13 2018 000 WTNT33 KNHC 132035 TCPAT3 BULLETIN Post-Tropical Cyclone Leslie Advisory Number 70 NWS National Hurricane Center Miami FL AL132018 500 PM AST Sat Oct 13 2018 ...LONG-LIVED LESLIE PREPARING TO MAKE LANDFALL ALONG THE WEST COAST OF PORTUGAL AS A POWERFUL POST-TROPICAL CYCLONE... ...DANGEROUS WINDS, SURF, AND HEAVY RAINFALL WILL AFFECT PORTIONS OF PORTUGAL AND SPAIN TONIGHT AND SUNDAY... ...THIS IS THE LAST ADVISORY... SUMMARY OF 500 PM AST...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...40.5N 9.5W ABOUT 85 MI...135 KM SSW OF PORTO PORTUGAL ABOUT 125 MI...200 KM N OF LISBON PORTUGAL MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NE OR 50 DEGREES AT 35 MPH...56 KM/H MINIMUM CENTRAL PRESSURE...984 MB...29.06 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. Interests in Portugal and Spain should monitor the progress of Leslie. Additional information on this system can be found in products from the Portuguese Institute for Sea and Atmosphere at www.ipma.pt. Interests in Spain should refer to products from the State Meteorological Agency at www.aemet.es. DISCUSSION AND OUTLOOK ---------------------- At 500 PM AST (2100 UTC), the center of Post-Tropical Cyclone Leslie was located near latitude 40.5 North, longitude 9.5 West. The post-tropical cyclone is moving toward the northeast near 35 mph (56 km/h) and this motion is expected to continue during the next 24 hours with a decrease in forward speed. On this track, the center of Leslie will be near the west-central coast of Portugal in a few hours, and move inland over portions of central and northern Portugal tonight, and across northwestern and northern Spain Sunday morning. Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Weakening is forecast after Leslie moves inland over the Iberian peninsula, and the cyclone is forecast to dissipate by Sunday afternoon or evening. Tropical-storm-force winds extend outward up to 160 miles (260 km) from the center. Lisbon, Portugal recently reported a wind gust to 40 mph (65 km/h). The estimated minimum central pressure is 984 mb (29.06 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Post-tropical Leslie will bring winds to near hurricane-force to portions of Portugal tonight, and gale-force winds to portions of western amd northern Spain later tonight through early Sunday. Please see products from your local meteorological service for more information on this hazard. RAINFALL: Leslie is expected to produce total rainfall accumulations of 1 to 3 inches (25 to 75 mm) with localized amounts up to 5 inches (125 mm) across portions of Portugal and Spain this weekend. This rainfall may lead to some instances of flash flooding. SURF: Swells generated by Leslie will continue to affect the Azores, Madeira Island, and the Canary Islands through the weekend, and will begin to affect the Atlantic coasts of Spain, Portugal, and Morocco today and continuing into Sunday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- This is the last public advisory issued by the National Hurricane Center on Leslie. $$ Forecaster Stewart
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Post-Tropical Cyclone Leslie Forecast Advisory Number 70
2018-10-13 22:35:31| National Hurricane Center (Atlantic)
Issued at 2100 UTC SAT OCT 13 2018 000 WTNT23 KNHC 132035 TCMAT3 POST-TROPICAL CYCLONE LESLIE FORECAST/ADVISORY NUMBER 70 NWS NATIONAL HURRICANE CENTER MIAMI FL AL132018 2100 UTC SAT OCT 13 2018 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN PORTUGAL AND SPAIN SHOULD MONITOR THE PROGRESS OF LESLIE. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN PRODUCTS FROM THE PORTUGUESE INSTITUTE FOR SEA AND ATMOSPHERE AT WWW.IPMA.PT. INTERESTS IN SPAIN SHOULD REFER TO PRODUCTS FROM THE STATE METEOROLOGICAL AGENCY AT WWW.AEMET.ES. POST-TROPICAL CYCLONE CENTER LOCATED NEAR 40.5N 9.5W AT 13/2100Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 30 KT ESTIMATED MINIMUM CENTRAL PRESSURE 984 MB MAX SUSTAINED WINDS 60 KT WITH GUSTS TO 75 KT. 50 KT....... 50NE 60SE 60SW 0NW. 34 KT.......120NE 140SE 140SW 140NW. 12 FT SEAS..300NE 240SE 540SW 540NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 40.5N 9.5W AT 13/2100Z AT 13/1800Z CENTER WAS LOCATED NEAR 39.3N 10.5W FORECAST VALID 14/0600Z 43.0N 4.9W...POST-TROPICAL INLAND MAX WIND 35 KT...GUSTS 45 KT. 34 KT...100NE 100SE 50SW 100NW. FORECAST VALID 14/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 40.5N 9.5W THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER ON LESLIE. $$ FORECASTER STEWART
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