ZCZC MIATCMAT3 ALL TTAA00 KNHC DDHHMM HURRICANE MITCH FORECAST/ADVISORY NUMBER 23 NATIONAL WEATHER SERVICE MIAMI FL AL1398 0900Z TUE OCT 27 1998 AT 4 AM EDT...0900 UTC...THE GOVERNMENT OF MEXICO HAS UPGRADED THE HURRICANE WATCH TO A HURRICANE WARNING FOR THE YUCATAN PENINSULA FROM CABO CATOCHE SOUTHWARD. THE GOVERNMENT OF GUATEMALA HAS ISSUED A HURRICANE WARNING FOR THE COAST OF GUATEMALA. A HURRICANE WARNING REMAINS IN EFFECT FOR THE ENTIRE COAST OF HONDURAS...AND FOR SWAN ISLAND. A TROPICAL STORM WARNING IS IN EFFECT FOR THE CAYMAN ISLANDS. A HURRICANE WATCH REMAINS IN EFFECT FOR BELIZE. ALL INTERESTS ELSEWHERE IN THE NORTHWESTERN CARIBBEAN SHOULD CLOSELY MONITOR THE PROGRESS OF THIS EXTREMELY DANGEROUS HURRICANE. HURRICANE CENTER LOCATED NEAR 17.4N 84.8W AT 27/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 7 KT ESTIMATED MINIMUM CENTRAL PRESSURE 917 MB EYE DIAMETER 20 NM MAX SUSTAINED WINDS 155 KT WITH GUSTS TO 185 KT 64 KT....... 50NE 50SE 50SW 50NW 50 KT.......100NE 100SE 75SW 100NW 34 KT.......125NE 125SE 125SW 150NW 12 FT SEAS..300NE 250SE 200SW 350NW ALL QUADRANT RADII IN NAUTICAL MILES REPEAT...CENTER LOCATED NEAR 17.4N 84.8W AT 27/0900Z AT 27/0600Z CENTER WAS LOCATED NEAR 17.4N 84.5W FORECAST VALID 27/1800Z 17.5N 85.7W MAX WIND 155 KT...GUSTS 185 KT 64 KT... 50NE 50SE 50SW 50NW 50 KT...100NE 100SE 75SW 100NW 34 KT...125NE 125SE 125SW 150NW FORECAST VALID 28/0600Z 17.9N 86.3W MAX WIND 150 KT...GUSTS 180 KT 64 KT... 50NE 50SE 50SW 50NW 50 KT...100NE 100SE 75SW 100NW 34 KT...125NE 125SE 125SW 150NW FORECAST VALID 28/1800Z 18.4N 86.6W MAX WIND 140 KT...GUSTS 170 KT 64 KT... 50NE 50SE 50SW 50NW 50 KT...100NE 100SE 75SW 100NW 34 KT...125NE 125SE 125SW 150NW REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 17.4N 84.8W EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE OUTLOOK VALID 29/0600Z 18.7N 86.8W MAX WIND 135 KT...GUSTS 165 KT 50 KT...100NE 100SE 75SW 100NW OUTLOOK VALID 30/0600Z 19.5N 87.0W MAX WIND 125 KT...GUSTS 150 KT 50 KT...100NE 100SE 75SW 75NW NEXT ADVISORY AT 27/1500Z GUINEY STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT3 AND WMO HEADER WTNT73 KNHC. NNNN