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Hurricane Grace Public Advisory Number 31
2021-08-21 04:58:18| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Fri Aug 20 2021 000 WTNT32 KNHC 210258 TCPAT2 BULLETIN Hurricane Grace Advisory Number 31 NWS National Hurricane Center Miami FL AL072021 1000 PM CDT Fri Aug 20 2021 ...GRACE RAPIDLY INTENSIFIES INTO A MAJOR HURRICANE... ...LANDFALL EXPECTED IN MAINLAND MEXICO LATER TONIGHT... SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...20.7N 96.3W ABOUT 75 MI...120 KM ESE OF TUXPAN MEXICO ABOUT 105 MI...165 KM N OF VERACRUZ MEXICO MAXIMUM SUSTAINED WINDS...120 MPH...195 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...967 MB...28.56 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. 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. Preparations to protect life and property should have already been completed. A Tropical Storm Warning means that tropical storm conditions are expected somewhere withing the warning area. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1000 PM CDT (0300 UTC), the center of Hurricane Grace was located near latitude 20.7 North, longitude 96.3 West. Grace is moving toward the west near 10 mph (17 km/h) and this general motion is expected to continue through landfall. On the forecast track, the center of Grace is forecast to make landfall along the coast of mainland Mexico within the hurricane warning area later tonight. Reports from an Air Force Reserve Hurricane Hunter aircraft indicate that maximum sustained winds have increased to near 120 mph (195 km/h) with higher gusts, making Grace a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some additional strengthening is possible until Grace makes landfall, with rapid weakening expected as Grace moves inland over the mountains of central Mexico. Hurricane-force winds extend outward up to 30 miles (45 km) from the center and tropical-storm-force winds extend outward up to 150 miles (240 km). The estimated minimum central pressure from reconnaissance aircraft data is 967 mb (28.56 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. STORM SURGE: A dangerous storm surge will raise water levels by as much as 6 to 9 ft above normal tide levels along the immediate coast within the hurricane warning area near and north of where the center makes landfall tonight. Near the coast, the surge will be accompanied by large and destructive waves. WIND: Hurricane conditions are expected within portions of the hurricane warning area in mainland Mexico tonight, with tropical storm conditions already occuring. Tropical storm conditions are expected to continue within the tropical storm warning area in mainland Mexico through tomorrow morning. RAINFALL: Grace is expected to produce the following rainfall amounts: Over Veracruz, Puebla, Tlaxcala, Hidalgo, 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 significant flash and urban flooding as well as mudslides. SURF: High surf generated by Grace will 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 100 AM CDT. Next complete advisory at 400 AM CDT. $$ Forecaster Papin/Beven
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