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Summary for Tropical Depression Eighteen (AT3/AL182021)

2021-09-23 10:34:16| National Hurricane Center (Atlantic)

...TROPICAL DEPRESSION EXPECTED TO STRENGTHEN AS IT MOVES ACROSS THE TROPICAL CENTRAL ATLANTIC... As of 5:00 AM AST Thu Sep 23 the center of Eighteen was located near 10.5, -36.4 with movement W at 15 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 35 mph.

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Tropical Depression Eighteen Public Advisory Number 3

2021-09-23 10:34:16| National Hurricane Center (Atlantic)

Issued at 500 AM AST Thu Sep 23 2021 000 WTNT33 KNHC 230834 TCPAT3 BULLETIN Tropical Depression Eighteen Advisory Number 3 NWS National Hurricane Center Miami FL AL182021 500 AM AST Thu Sep 23 2021 ...TROPICAL DEPRESSION EXPECTED TO STRENGTHEN AS IT MOVES ACROSS THE TROPICAL CENTRAL ATLANTIC... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...10.5N 36.4W ABOUT 1860 MI...2995 KM ESE OF THE NORTHERN LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 500 AM AST (0900 UTC), the center of Tropical Depression Eighteen was located near latitude 10.5 North, longitude 36.4 West. The depression is moving toward the west near 15 mph (24 km/h) and this general motion is expected to continue through Friday. A slower motion toward the west-northwest is expected Friday night and continuing into the weekend. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Strengthening is forecast during the next few days, and the depression could become a tropical storm later today. It is then forecast to become a hurricane over the weekend. The estimated minimum central pressure is 1008 mb (29.77 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 1100 AM AST. $$ Forecaster Cangialosi

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Tropical Depression Eighteen Wind Speed Probabilities Number 3

2021-09-23 10:34:16| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 23 2021 000 FONT13 KNHC 230834 PWSAT3 TROPICAL DEPRESSION EIGHTEEN WIND SPEED PROBABILITIES NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021 0900 UTC THU SEP 23 2021 AT 0900Z THE CENTER OF TROPICAL DEPRESSION EIGHTEEN WAS LOCATED NEAR LATITUDE 10.5 NORTH...LONGITUDE 36.4 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 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 06Z THU 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 06Z THU 18Z THU 06Z FRI 18Z FRI 06Z SAT 06Z SUN 06Z MON PERIODS TO TO TO TO TO TO TO 18Z THU 06Z FRI 18Z FRI 06Z SAT 06Z SUN 06Z MON 06Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER CANGIALOSI

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Tropical Depression Eighteen Forecast Advisory Number 3

2021-09-23 10:33:47| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 23 2021 000 WTNT23 KNHC 230833 TCMAT3 TROPICAL DEPRESSION EIGHTEEN FORECAST/ADVISORY NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021 0900 UTC THU SEP 23 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 10.5N 36.4W AT 23/0900Z POSITION ACCURATE WITHIN 40 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 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 10.5N 36.4W AT 23/0900Z AT 23/0600Z CENTER WAS LOCATED NEAR 10.4N 35.7W FORECAST VALID 23/1800Z 10.8N 38.4W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 50NE 0SE 0SW 40NW. FORECAST VALID 24/0600Z 11.3N 40.9W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 0SE 0SW 50NW. FORECAST VALID 24/1800Z 11.9N 43.3W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 0NW. 34 KT... 80NE 40SE 0SW 50NW. FORECAST VALID 25/0600Z 12.5N 45.2W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 20NE 20SE 0SW 20NW. 34 KT... 80NE 50SE 20SW 40NW. FORECAST VALID 25/1800Z 13.0N 46.9W MAX WIND 70 KT...GUSTS 85 KT. 50 KT... 30NE 20SE 10SW 20NW. 34 KT... 80NE 60SE 30SW 50NW. FORECAST VALID 26/0600Z 13.7N 48.3W MAX WIND 80 KT...GUSTS 100 KT. 50 KT... 40NE 30SE 20SW 30NW. 34 KT... 90NE 80SE 40SW 60NW. 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 27/0600Z 15.0N 50.8W MAX WIND 90 KT...GUSTS 110 KT. OUTLOOK VALID 28/0600Z 16.9N 53.9W MAX WIND 100 KT...GUSTS 120 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 10.5N 36.4W NEXT ADVISORY AT 23/1500Z $$ FORECASTER CANGIALOSI

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