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Tropical Storm Grace Public Advisory Number 20
2021-08-18 10:55:16| National Hurricane Center (Atlantic)
Issued at 500 AM EDT Wed Aug 18 2021 248 WTNT32 KNHC 180855 TCPAT2 BULLETIN Tropical Storm Grace Advisory Number 20 NWS National Hurricane Center Miami FL AL072021 500 AM EDT Wed Aug 18 2021 ...OUTER BANDS WITH HEAVY RAINFALL AND GUSTY WINDS BEGINNING TO SPREAD ACROSS THE CAYMAN ISLANDS... ...GRACE STILL FORECAST TO BECOME A HURRICANE LATER TODAY... SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...18.8N 80.9W ABOUT 40 MI...65 KM SSE OF GRAND CAYMAN ABOUT 440 MI...710 KM ESE OF TULUM MEXICO MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 16 MPH...26 KM/H MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Jamaica has discontinued the Tropical Storm Warning for Jamaica. The government of Cuba has discontinued the Tropical Storm Warning for the southern coast Cuban provinces of Granma, Las Tunas, and Camaguey. The Tropical Storm Watch for the southern coast of the Cuban provinces of Ciego de Avila, Sancti Spiritus, Cienfuegos, Matanzas have also been discontinued. The government of Mexico has upgraded the Tropical Storm Watch to a Tropical Storm Warning for the north and west coasts of the Yucatan Peninsula from west of Dzilam to Campeche. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Yucatan Peninsula of Mexico from Cancun to Punta Herrero, including Cozumel A Hurricane Watch is in effect for... * Cayman Islands A Tropical Storm Warning is in effect for... * Cayman Islands * Yucatan Peninsula of Mexico from north of Cancun to Campeche * Yucatan Peninsula of Mexico from south of Punta Herrero to Puerto Costa Maya A Tropical Storm Watch is in effect for... * Southern coast Cuban province of Pinar del Rio, as well as Isla de la Juventud A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A warning is typically issued 36 hours before the anticipated first occurrence of tropical-storm- force winds, conditions that make outside preparations difficult or dangerous. Preparations to protect life and property should be rushed to completion. A Hurricane Watch means that hurricane conditions are possible within the watch area. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area. Interests elsewhere in the Yucatan Peninsula of Mexico should monitor the progress of Grace. Additional watches or warnings may be required later this morning. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 500 AM EDT (0900 UTC), the center of Tropical Storm Grace was located near latitude 18.8 North, longitude 80.9 West. Grace is moving toward the west near 16 mph (26 km/h). A general westward to west-northwestward motion is expected for the next several days. On the forecast track, the center of Grace will continue to move near or over the Cayman Islands later this morning. Grace will approach the Yucatan peninsula of Mexico tonight or early Thursday. Maximum sustained winds have increased to near 65 mph (100 km/h) with higher gusts. Grace is forecast to strengthen into a hurricane by tonight, with some additional strengthening possible prior to the center reaching the eastern Yucatan Peninsula. Tropical-storm-force winds extend outward up to 115 miles (185 km) from the center. A reporting station near Rum Point Beach on the north shore of Grand Cayman recently measured a sustained wind of 40 mph (64 km/h) and a gust to 47 mph (76 km/h). The estimated minimum central pressure is 998 mb (29.47 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: Tropical storm conditions are expected along a portion of the southern coast of Cuba within the warning area and over the Cayman Islands through this morning. Hurricane conditions are possible in the Cayman Islands later this morning. Tropical storm conditions are possible along the southern coast of Cuba within the watch area through today. Hurricane conditions are expected within the warning area in the Yucatan Peninsula of Mexico late tonight, with tropical storm conditions beginning as early as this evening. RAINFALL: Grace is expected to produce the following rainfall amounts: Over Jamaica, the Cayman Islands, portions of the Yucatan Peninsula and Vera Cruz state....4 to 8 inches of rain with isolated maximum totals of 12 inches are expected through Friday night. This heavy rainfall could lead to flash and urban flooding, with mudslides possible in Jamaica. STORM SURGE: A storm surge could raise water levels as high as 1 to 3 ft above normal tide levels in portions of the Cayman Islands. A dangerous storm surge will raise water levels by as much as 3 to 5 ft above normal tide levels along the immediate coast near and to the north of where the center makes landfall in the northeastern Yucatan Peninsula late tonight or early Thursday. Near the coast, the surge will be accompanied by large and destructive waves. SURF: Swells generated by Grace will spread westward from Jamaica to the Cayman Islands, the southern coast of Cuba, and the Yucatan Peninsula of Mexico. 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 800 AM EDT. Next complete advisory at 1100 AM EDT. $$ Forecaster Stewart
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