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Summary for Hurricane Sam (AT3/AL182021)

2021-09-29 22:50:19| National Hurricane Center (Atlantic)

...CATEGORY 4 HURRICANE SAM PASSING WELL TO THE EAST-NORTHEAST OF THE NORTHERN LEEWARD ISLANDS... As of 5:00 PM AST Wed Sep 29 the center of Sam was located near 20.2, -57.6 with movement NW at 9 mph. The minimum central pressure was 945 mb with maximum sustained winds of about 130 mph.

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Hurricane Sam Public Advisory Number 29

2021-09-29 22:50:19| National Hurricane Center (Atlantic)

Issued at 500 PM AST Wed Sep 29 2021 000 WTNT33 KNHC 292050 TCPAT3 BULLETIN Hurricane Sam Advisory Number 29 NWS National Hurricane Center Miami FL AL182021 500 PM AST Wed Sep 29 2021 ...CATEGORY 4 HURRICANE SAM PASSING WELL TO THE EAST-NORTHEAST OF THE NORTHERN LEEWARD ISLANDS... SUMMARY OF 500 PM AST...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...20.2N 57.6W ABOUT 385 MI...620 KM ENE OF THE NORTHERN LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...130 MPH...215 KM/H PRESENT MOVEMENT...NW OR 310 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...945 MB...27.91 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 500 PM AST (2100 UTC), the center of Hurricane Sam was located near latitude 20.2 North, longitude 57.6 West. Sam is moving toward the northwest near 9 mph (15 km/h), and this general motion with an increase in forward speed is expected during the next couple of days. A turn toward the north is forecast by Friday. On the forecast track, Sam will continue to pass well to the east-northeast of the northern Leeward Islands through tonight. Maximum sustained winds are near 130 mph (215 km/h) with higher gusts. Sam is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some fluctuations in intensity are expected during the next couple of days, but Sam is forecast to remain a major hurricane through late this week. Hurricane-force winds extend outward up to 40 miles (65 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km). An Air Force Reserve Unit Hurricane Hunter aircraft reported a minimum central pressure of 945 mb (27.91 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Sam can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC. SURF: Swells generated by Sam will impact the Lesser Antilles during the next several days. Swells are expected to reach Bermuda and the Bahamas in a day or so, and then spread to the United States east coast by this weekend. 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 PM AST. $$ Forecaster Pasch

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Hurricane Sam Wind Speed Probabilities Number 29

2021-09-29 22:50:19| National Hurricane Center (Atlantic)

Issued at 2100 UTC WED SEP 29 2021 000 FONT13 KNHC 292050 PWSAT3 HURRICANE SAM WIND SPEED PROBABILITIES NUMBER 29 NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021 2100 UTC WED SEP 29 2021 AT 2100Z THE CENTER OF HURRICANE SAM WAS LOCATED NEAR LATITUDE 20.2 NORTH...LONGITUDE 57.6 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 115 KTS...130 MPH...215 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 18Z WED AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 18Z WED 06Z THU 18Z THU 06Z FRI 18Z FRI 18Z SAT 18Z SUN PERIODS TO TO TO TO TO TO TO 06Z THU 18Z THU 06Z FRI 18Z FRI 18Z SAT 18Z SUN 18Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT HIBERNIA OILFD 34 X X( X) X( X) X( X) X( X) X( X) 7( 7) CAPE RACE NFLD 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) BERMUDA 34 X X( X) X( X) 4( 4) 19(23) 1(24) 1(25) BERMUDA 50 X X( X) X( X) X( X) 4( 4) 1( 5) X( 5) BERMUDA 64 X X( X) X( X) X( X) 1( 1) X( 1) X( 1) $$ FORECASTER PASCH

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Hurricane Sam Forecast Advisory Number 29

2021-09-29 22:49:55| National Hurricane Center (Atlantic)

Issued at 2100 UTC WED SEP 29 2021 000 WTNT23 KNHC 292049 TCMAT3 HURRICANE SAM FORECAST/ADVISORY NUMBER 29 NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021 2100 UTC WED SEP 29 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. HURRICANE CENTER LOCATED NEAR 20.2N 57.6W AT 29/2100Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 310 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 945 MB MAX SUSTAINED WINDS 115 KT WITH GUSTS TO 140 KT. 64 KT....... 35NE 30SE 25SW 30NW. 50 KT....... 70NE 50SE 40SW 50NW. 34 KT.......120NE 120SE 80SW 90NW. 12 FT SEAS..180NE 120SE 150SW 180NW. 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 20.2N 57.6W AT 29/2100Z AT 29/1800Z CENTER WAS LOCATED NEAR 19.8N 57.3W FORECAST VALID 30/0600Z 21.2N 58.9W MAX WIND 120 KT...GUSTS 145 KT. 64 KT... 35NE 30SE 25SW 30NW. 50 KT... 60NE 50SE 40SW 50NW. 34 KT...120NE 120SE 90SW 100NW. FORECAST VALID 30/1800Z 23.1N 60.4W MAX WIND 120 KT...GUSTS 145 KT. 64 KT... 35NE 30SE 25SW 30NW. 50 KT... 60NE 50SE 40SW 50NW. 34 KT...120NE 120SE 90SW 100NW. FORECAST VALID 01/0600Z 25.6N 61.4W MAX WIND 120 KT...GUSTS 145 KT. 64 KT... 40NE 40SE 30SW 40NW. 50 KT... 70NE 60SE 50SW 60NW. 34 KT...130NE 130SE 90SW 100NW. FORECAST VALID 01/1800Z 28.3N 61.9W MAX WIND 115 KT...GUSTS 140 KT. 64 KT... 50NE 40SE 30SW 40NW. 50 KT... 70NE 70SE 60SW 60NW. 34 KT...130NE 140SE 90SW 100NW. FORECAST VALID 02/0600Z 31.0N 61.3W MAX WIND 110 KT...GUSTS 135 KT. 50 KT... 70NE 70SE 60SW 60NW. 34 KT...140NE 150SE 110SW 120NW. FORECAST VALID 02/1800Z 33.6N 59.9W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 70NE 70SE 60SW 60NW. 34 KT...150NE 150SE 120SW 130NW. 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 03/1800Z 37.5N 55.0W MAX WIND 85 KT...GUSTS 105 KT. OUTLOOK VALID 04/1800Z 42.0N 48.5W MAX WIND 70 KT...GUSTS 85 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 20.2N 57.6W NEXT ADVISORY AT 30/0300Z $$ FORECASTER PASCH

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