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Summary for Tropical Storm Grace (AT2/AL072021)

2021-08-18 10:55:16| National Hurricane Center (Atlantic)

...OUTER BANDS WITH HEAVY RAINFALL AND GUSTY WINDS BEGINNING TO SPREAD ACROSS THE CAYMAN ISLANDS... ...GRACE STILL FORECAST TO BECOME A HURRICANE LATER TODAY... As of 5:00 AM EDT Wed Aug 18 the center of Grace was located near 18.8, -80.9 with movement W at 16 mph. The minimum central pressure was 998 mb with maximum sustained winds of about 65 mph.

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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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Tropical Storm Henri Forecast Discussion Number 10

2021-08-18 10:54:14| National Hurricane Center (Atlantic)

Issued at 500 AM AST Wed Aug 18 2021 000 WTNT43 KNHC 180854 TCDAT3 Tropical Storm Henri Discussion Number 10 NWS National Hurricane Center Miami FL AL082021 500 AM AST Wed Aug 18 2021 There's been little change in Henri's satellite appearance this morning. The surface center is still located just to the northwest of a gradually expanding central dense overcast, and there still appears to be an eye-like feature in the Bermuda Doppler radar presentation. However, there are no indications in the GOES-16 BD-curve enhanced infrared images of a developing warm spot. Subjective and objective satellite intensity estimates remain steady, and the initial intensity is held at 55 kt for this advisory. Although the surrounding thermodynamic environment is ripe for further significant development, moderate northwesterly shear continues to impinge on the cyclone causing difficulty in inner-core convective development. Consequently, little change in strength is expected during the next couple days, and in fact the statistical SHIPS model indicates an increase in a more northerly shear component on Thursday. By Saturday afternoon, however, the shear should decrease as the cyclone slides beneath an upper ridge axis off of the southeast U.S. coast. Henri is expected to further intensity through the remaining period as the upper-wind flow becomes much more diffluent. The official intensity forecast is similar to the previous advisory, and lies between the SHIPS model and the HFIP Corrected Consensus Approach aid after the 60-hour period. The initial motion is estimated to be westward, or 260/7 kt. A high amplitude mid- to upper-level anticyclone situated north-northeast of Henri should steer the cyclone toward the west during the next 36 hours, or so. Thereafter, the aforementioned ridge is forecast to weaken and shift eastward in response to a mid-latitude shortwave trough moving over the northeastern U.S. As a result of the change in the synoptic steering pattern, Henri should turn toward the northwest, north, and then northeast through the remaining portion of the forecast. With so much uncertainty or spread in the global and regional models beyond day 3, the best approach at this point is to base the NHC forecast on the better performing multi-model consensus guidance, which has once again shifted a bit to the left of the previous track forecast. I think it's worth noting that the GFSv16 model is now showing a shortwave ridge building over eastern Canada on Sunday, which causes Henri to move more northward toward the New England coast. Therefore, additional changes or shifts of the track beyond the 60-hour period may be required on subsequent advisories. Due to the increased uncertainty in the track forecast, interests along the New England coast should monitor the progress of Henri. FORECAST POSITIONS AND MAX WINDS INIT 18/0900Z 30.1N 65.7W 55 KT 65 MPH 12H 18/1800Z 29.9N 66.9W 60 KT 70 MPH 24H 19/0600Z 29.8N 68.7W 60 KT 70 MPH 36H 19/1800Z 29.8N 70.6W 60 KT 70 MPH 48H 20/0600Z 30.4N 71.8W 60 KT 70 MPH 60H 20/1800Z 31.4N 72.3W 65 KT 75 MPH 72H 21/0600Z 33.0N 71.9W 70 KT 80 MPH 96H 22/0600Z 37.6N 69.0W 75 KT 85 MPH 120H 23/0600Z 40.5N 66.1W 65 KT 75 MPH $$ Forecaster Roberts

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Summary for Tropical Storm Henri (AT3/AL082021)

2021-08-18 10:53:49| National Hurricane Center (Atlantic)

...HENRI NOW MOVING WESTWARD...NO CHANGE IN STRENGTH... As of 5:00 AM AST Wed Aug 18 the center of Henri was located near 30.1, -65.7 with movement W at 8 mph. The minimum central pressure was 998 mb with maximum sustained winds of about 65 mph.

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Tropical Storm Henri Public Advisory Number 10

2021-08-18 10:53:49| National Hurricane Center (Atlantic)

Issued at 500 AM AST Wed Aug 18 2021 000 WTNT33 KNHC 180853 TCPAT3 BULLETIN Tropical Storm Henri Advisory Number 10 NWS National Hurricane Center Miami FL AL082021 500 AM AST Wed Aug 18 2021 ...HENRI NOW MOVING WESTWARD...NO CHANGE IN STRENGTH... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...30.1N 65.7W ABOUT 160 MI...260 KM SSW OF BERMUDA MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H PRESENT MOVEMENT...W OR 260 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Bermuda Weather Service has discontinued the Tropical Storm Watch for Bermuda. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: There are no coastal watches or warnings in effect. For additional storm information, please monitor products issued by the Bermuda Weather Service. DISCUSSION AND OUTLOOK ---------------------- At 500 AM AST (0900 UTC), the center of Tropical Storm Henri was located near latitude 30.1 North, longitude 65.7 West. Henri is moving toward the west near 8 mph (13 km/h). A gradual turn to the west-northwest and Northwest by late Thursday is expected, followed by a turn to the northwest on Friday. Maximum sustained winds are near 65 mph (100 km/h) with higher gusts. Little change in strength if forecast through Thursday. However, Henri could still become a hurricane by the weekend. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center. The estimated minimum central pressure is 998 mb (29.47 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions are possible tonight across Bermuda and the nearby waters, particularly to the south of the island. SURF: Swells generated by Henri should continue to affect Bermuda during the next day or so. Swells could increase along the southeast and mid-Atlantic U.S. coasts by the end of the week. These swells could cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 AM AST. $$ Forecaster Roberts

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