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Post-Tropical Cyclone Marco Forecast Advisory Number 21
2020-08-25 10:39:29| National Hurricane Center (Atlantic)
Issued at 0900 UTC TUE AUG 25 2020 400 WTNT24 KNHC 250839 TCMAT4 POST-TROPICAL CYCLONE MARCO FORECAST/ADVISORY NUMBER 21 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142020 0900 UTC TUE AUG 25 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. POST-TROPICAL CYCLONE CENTER LOCATED NEAR 28.8N 91.2W AT 25/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 9 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 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 28.8N 91.2W AT 25/0900Z AT 25/0600Z CENTER WAS LOCATED NEAR 28.8N 90.7W FORECAST VALID 25/1800Z 28.8N 92.7W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 26/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 28.8N 91.2W THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER ON THIS MARCO. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC. $$ FORECASTER STEWART
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Post-Tropical Cyclone Marco Wind Speed Probabilities Number 21
2020-08-25 10:39:29| National Hurricane Center (Atlantic)
Issued at 0900 UTC TUE AUG 25 2020 383 FONT14 KNHC 250839 PWSAT4 POST-TROPICAL CYCLONE MARCO WIND SPEED PROBABILITIES NUMBER 21 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142020 0900 UTC TUE AUG 25 2020 AT 0900Z THE CENTER OF POST-TROPICAL CYCLONE MARCO WAS LOCATED NEAR LATITUDE 28.8 NORTH...LONGITUDE 91.2 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 25 KTS...30 MPH...45 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 TUE 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 TUE 18Z TUE 06Z WED 18Z WED 06Z THU 06Z FRI 06Z SAT PERIODS TO TO TO TO TO TO TO 18Z TUE 06Z WED 18Z WED 06Z THU 06Z FRI 06Z SAT 06Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER STEWART
Tropical Depression Marco Graphics
2020-08-25 04:32:45| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Tue, 25 Aug 2020 02:32:45 GMT Wind Speed Probabilities last updated Tue, 25 Aug 2020 03:31:45 GMT
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Tropical Depression Marco Forecast Discussion Number 20
2020-08-25 04:31:54| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Mon Aug 24 2020 000 WTNT44 KNHC 250231 TCDAT4 Tropical Depression Marco Discussion Number 20 NWS National Hurricane Center Miami FL AL142020 1000 PM CDT Mon Aug 24 2020 Visible imagery and surface observations indicated that Marco made landfall around 6 pm CDT near the mouth of the Mississippi River. Shortly before landfall, reports from an Air Force Reserve Hurricane Hunter plane indicated that Marco was still producing a small area of tropical-storm-force winds over water to the northeast of its center. Since then, the system has moved almost due west along the southeast coast of Louisiana while its deep convection has become farther displaced from the low-level center. Between the lack of central convection and Marco's proximity to land, it is likely that the winds have decreased since earlier this evening and the intensity has been lowered to 30 kt. If deep convection does not redevelop overnight, Marco will become a remnant low as soon as Tuesday morning. Regardless of its status, Marco should move generally westward near the coast of Louisiana while it weakens for the next day or so and could continue to produce heavy rain for portions of the north-central Gulf Coast tonight. The system is then forecast to dissipate by early Wednesday, if not sooner. FORECAST POSITIONS AND MAX WINDS INIT 25/0300Z 29.0N 89.8W 30 KT 35 MPH 12H 25/1200Z 29.0N 91.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 26/0000Z 29.0N 93.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 26/1200Z...DISSIPATED $$ Forecaster Zelinsky
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Summary for Tropical Depression Marco (AT4/AL142020)
2020-08-25 04:31:24| National Hurricane Center (Atlantic)
...MARCO WEAKENS TO A TROPICAL DEPRESSION... ...HEAVY RAIN STILL POSSIBLE TONIGHT ACROSS PORTIONS OF THE CENTRAL GULF COAST... As of 10:00 PM CDT Mon Aug 24 the center of Marco was located near 29.0, -89.8 with movement W at 9 mph. The minimum central pressure was 1007 mb with maximum sustained winds of about 35 mph.
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