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Tropical Storm Grace Graphics
2021-08-20 10:53:37| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Fri, 20 Aug 2021 08:53:37 GMT Wind Speed Probabilities last updated Fri, 20 Aug 2021 09:22:51 GMT
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Tropical Storm Grace Forecast Discussion Number 28
2021-08-20 10:52:38| National Hurricane Center (Atlantic)
Issued at 400 AM CDT Fri Aug 20 2021 000 WTNT42 KNHC 200852 TCDAT2 Tropical Storm Grace Discussion Number 28 NWS National Hurricane Center Miami FL AL072021 400 AM CDT Fri Aug 20 2021 Deep convection has increased near the center of Grace overnight with improved banding structure over the eastern portion of the circulation. An Air Force Reserve Hurricane Hunter aircraft measured a peak 850-mb flight-level wind of 72 kt and SFMR winds of 58 kt during the aircraft's final pass through the northern portion of the storm prior to 06Z. Based on those observations, the initial wind speed was increased to 60 kt on the 06Z intermediate advisory, and it remains at that value for now. Grace is close to re-gaining hurricane strength, and the next reconnaissance mission should be in the storm around 1200 UTC this morning. Grace will be moving over the warm waters over the Bay of Campeche today. That, along with light to moderate vertical wind shear conditions, are expected to allow for re-intensification until landfall in mainland Mexico tonight. The updated intensity forecast brings Grace to a 75-kt hurricane in 12 hours, and the storm could be slightly stronger when it makes landfall overnight. By 24 h, the center is forecast to be inland, and Grace will likely already to have begun to weaken. Rapid weakening should occur on Saturday as Grace moves farther inland over the mountainous terrain of central Mexico, and the circulation is likely to dissipate in around 48 hours. The remnants of Grace are expected to move into the Pacific where they are likely to spawn a new tropical cyclone. The cyclone has been moving westward or 270/14 kt. A strong mid-level ridge to the north of Grace should continue to steer the cyclone westward to west-southwestward until dissipation occurs in a couple days. The new NHC track forecast is near the middle of the guidance envelope and is essentially unchanged from the previous advisory. Key Messages: 1. Hurricane conditions and dangerous storm surge are likely along portions of eastern mainland Mexico beginning late today. A Hurricane Warning is in effect from Puerto Veracruz northward to Cabo Rojo. 2. Through the weekend, heavy rainfall across Veracruz, Puebla, Tlaxcala, Hidalgo, northern Queretaro, and eastern San Luis Potosi will lead to flash and urban flooding, along with the likelihood of mudslides. FORECAST POSITIONS AND MAX WINDS INIT 20/0900Z 20.7N 93.3W 60 KT 70 MPH 12H 20/1800Z 20.6N 95.2W 75 KT 85 MPH 24H 21/0600Z 20.3N 97.4W 70 KT 80 MPH...INLAND 36H 21/1800Z 19.8N 99.7W 35 KT 40 MPH...INLAND 48H 22/0600Z 19.4N 102.2W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 22/1800Z...DISSIPATED $$ Forecaster Brown
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Summary for Tropical Storm Grace (AT2/AL072021)
2021-08-20 10:52:02| National Hurricane Center (Atlantic)
...GRACE EXPECTED TO BECOME A HURRICANE AGAIN SOON... ...PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO COMPLETION IN THE HURRICANE WARNING AREA... As of 4:00 AM CDT Fri Aug 20 the center of Grace was located near 20.7, -93.3 with movement W at 16 mph. The minimum central pressure was 994 mb with maximum sustained winds of about 70 mph.
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Tropical Storm Grace Public Advisory Number 28
2021-08-20 10:52:02| National Hurricane Center (Atlantic)
Issued at 400 AM CDT Fri Aug 20 2021 000 WTNT32 KNHC 200851 TCPAT2 BULLETIN Tropical Storm Grace Advisory Number 28 NWS National Hurricane Center Miami FL AL072021 400 AM CDT Fri Aug 20 2021 ...GRACE EXPECTED TO BECOME A HURRICANE AGAIN SOON... ...PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO COMPLETION IN THE HURRICANE WARNING AREA... SUMMARY OF 400 AM CDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...20.7N 93.3W ABOUT 265 MI...425 KM E OF TUXPAN MEXICO ABOUT 215 MI...345 KM ENE OF VERACRUZ MEXICO MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 16 MPH...26 KM/H MINIMUM CENTRAL PRESSURE...994 MB...29.36 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Mexico has discontinued the Tropical Storm Warning along the west coast of the Yucatan peninsula. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * The coast of mainland Mexico from Puerto Veracruz to Cabo Rojo A Tropical Storm Warning is in effect for... * The coast of mainland Mexico from north of Cabo Rojo to Barra del Tordo A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area, in this case within 24 hours. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere withing the warning area, in this case within 12 to 24 hours. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 400 AM CDT (0900 UTC), the center of Tropical Storm Grace was located near latitude 20.7 North, longitude 93.3 West. Grace is moving toward the west near 16 mph (26 km/h). A westward to west-southwestward motion at a slightly slower forward speed is expected during the next day or two. On the forecast track, the center of Grace is forecast to move across the southwestern Gulf of Mexico today, and then make landfall along the coast of mainland Mexico this evening or tonight. Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Strengthening is likely until Grace makes landfall, and the system is expected to regain hurricane strength this morning. After landfall, Grace should weaken rapidly as it moves into the mountains of central Mexico. Tropical-storm-force winds extend outward up to 150 miles (240 km) from the center. The estimated minimum central pressure is 994 mb (29.36 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Grace can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT2, WMO header WTNT42 KNHC and on the web at www.hurricanes.gov/graphics_at2.shtml?key_messages. WIND: Hurricane conditions are expected in the hurricane warning area in mainland Mexico by late this evening. Tropical storm conditions are expected within the tropical storm warning area in mainland Mexico by late this afternoon. RAINFALL: Grace is expected to produce the following rainfall amounts: Over Veracruz, Puebla, Tlaxcala, Hidalgo, northern Queretaro, and eastern San Luis Potosi...6 to 12 inches of rain with isolated maximum totals of 18 inches are expected today through Sunday. Heavy rainfall from Grace will result in areas of flash and urban flooding as well as mudslides. STORM SURGE: A dangerous storm surge will raise water levels by as much as 3 to 5 ft above normal tide levels within the hurricane warning area along the immediate coast of mainland Mexico near and to the north of where the center makes landfall tonight. Near the coast, the surge will be accompanied by large and destructive waves. SURF: High surf generated by Grace will begin to affect the southern Gulf of Mexico coastline today and continue 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 intermediate advisory at 700 AM CDT. Next complete advisory at 1000 AM CDT. $$ Forecaster Brown
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Tropical Storm Grace Wind Speed Probabilities Number 28
2021-08-20 10:52:02| National Hurricane Center (Atlantic)
Issued at 0900 UTC FRI AUG 20 2021 000 FONT12 KNHC 200851 PWSAT2 TROPICAL STORM GRACE WIND SPEED PROBABILITIES NUMBER 28 NWS NATIONAL HURRICANE CENTER MIAMI FL AL072021 0900 UTC FRI AUG 20 2021 AT 0900Z THE CENTER OF TROPICAL STORM GRACE WAS LOCATED NEAR LATITUDE 20.7 NORTH...LONGITUDE 93.3 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 06Z FRI 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 FRI 18Z FRI 06Z SAT 18Z SAT 06Z SUN 06Z MON 06Z TUE PERIODS TO TO TO TO TO TO TO 18Z FRI 06Z SAT 18Z SAT 06Z SUN 06Z MON 06Z TUE 06Z WED FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT GFMX 250N 960W 34 5 3( 8) X( 8) X( 8) X( 8) X( 8) X( 8) LA PESCA MX 34 2 8(10) 1(11) X(11) X(11) X(11) X(11) TAMPICO MX 34 4 37(41) 4(45) X(45) X(45) X(45) X(45) TAMPICO MX 50 X 2( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) TUXPAN MX 34 9 82(91) 2(93) X(93) X(93) X(93) X(93) TUXPAN MX 50 X 43(43) 3(46) X(46) X(46) X(46) X(46) TUXPAN MX 64 X 13(13) 2(15) X(15) X(15) X(15) X(15) VERACRUZ MX 34 16 35(51) X(51) X(51) X(51) X(51) X(51) VERACRUZ MX 50 1 4( 5) X( 5) X( 5) X( 5) X( 5) X( 5) FRONTERA MX 34 2 1( 3) X( 3) X( 3) X( 3) X( 3) X( 3) $$ FORECASTER BROWN
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