144 WTNT22 KNHC 180851 TCMAT2 TROPICAL STORM GRACE FORECAST/ADVISORY NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL AL072021 0900 UTC WED AUG 18 2021 CHANGES IN WATCHES AND WARNINGS 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. TROPICAL STORM CENTER LOCATED NEAR 18.8N 80.9W AT 18/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 998 MB MAX SUSTAINED WINDS 55 KT WITH GUSTS TO 65 KT. 50 KT....... 50NE 0SE 0SW 0NW. 34 KT.......100NE 90SE 0SW 60NW. 12 FT SEAS..120NE 60SE 60SW 60NW. 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 18.8N 80.9W AT 18/0900Z AT 18/0600Z CENTER WAS LOCATED NEAR 18.7N 80.1W FORECAST VALID 18/1800Z 19.3N 83.2W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 50NE 0SE 0SW 30NW. 34 KT...100NE 90SE 0SW 60NW. FORECAST VALID 19/0600Z 19.9N 86.4W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 50NE 0SE 0SW 40NW. 34 KT...100NE 90SE 0SW 60NW. FORECAST VALID 19/1800Z 20.3N 89.4W...INLAND MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 0NW. 34 KT...100NE 60SE 0SW 70NW. FORECAST VALID 20/0600Z 20.6N 92.1W...OVER WATER MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 0SE 0SW 20NW. 34 KT...100NE 40SE 30SW 80NW. FORECAST VALID 20/1800Z 20.7N 94.4W MAX WIND 65 KT...GUSTS 80 KT. 50 KT... 40NE 40SE 0SW 30NW. 34 KT...100NE 70SE 40SW 90NW. FORECAST VALID 21/0600Z 20.7N 96.8W MAX WIND 75 KT...GUSTS 90 KT. 50 KT... 50NE 40SE 0SW 40NW. 34 KT...110NE 90SE 40SW 100NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 22/0600Z 20.6N 101.4W...INLAND MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 23/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.8N 80.9W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 18/1200Z NEXT ADVISORY AT 18/1500Z $$ FORECASTER STEWART