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Tropical Storm Helene Forecast Advisory Number 9

2018-09-09 16:41:13| National Hurricane Center (Atlantic)

Issued at 1500 UTC SUN SEP 09 2018 960 WTNT23 KNHC 091441 TCMAT3 TROPICAL STORM HELENE FORECAST/ADVISORY NUMBER 9 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082018 1500 UTC SUN SEP 09 2018 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WATCH IS IN EFFECT FOR... * THE CABO VERDE ISLANDS OF SANTIAGO... FOGO... AND BRAVA A TROPICAL STORM WARNING IS IN EFFECT FOR... * THE CABO VERDE ISLANDS OF SANTIAGO... FOGO... AND BRAVA 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. TROPICAL STORM CENTER LOCATED NEAR 13.2N 25.0W AT 09/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 997 MB MAX SUSTAINED WINDS 55 KT WITH GUSTS TO 65 KT. 50 KT....... 30NE 30SE 0SW 30NW. 34 KT....... 70NE 60SE 30SW 60NW. 12 FT SEAS..120NE 240SE 180SW 90NW. 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 13.2N 25.0W AT 09/1500Z AT 09/1200Z CENTER WAS LOCATED NEAR 13.2N 24.4W FORECAST VALID 10/0000Z 13.7N 27.1W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 20NE 0SE 0SW 0NW. 50 KT... 40NE 30SE 0SW 30NW. 34 KT... 70NE 60SE 30SW 60NW. FORECAST VALID 10/1200Z 14.3N 30.0W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 20NE 10SE 0SW 10NW. 50 KT... 40NE 40SE 20SW 30NW. 34 KT... 80NE 80SE 50SW 80NW. FORECAST VALID 11/0000Z 14.9N 32.8W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 20NE 10SE 0SW 10NW. 50 KT... 40NE 40SE 20SW 30NW. 34 KT...100NE 80SE 50SW 100NW. FORECAST VALID 11/1200Z 15.7N 35.2W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 30NE 20SE 10SW 20NW. 50 KT... 60NE 40SE 30SW 40NW. 34 KT...120NE 90SE 60SW 120NW. FORECAST VALID 12/1200Z 17.8N 38.6W MAX WIND 80 KT...GUSTS 100 KT. 50 KT... 60NE 40SE 30SW 50NW. 34 KT...120NE 90SE 60SW 120NW. 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 13/1200Z 21.0N 41.0W MAX WIND 65 KT...GUSTS 80 KT. OUTLOOK VALID 14/1200Z 26.0N 43.0W MAX WIND 55 KT...GUSTS 65 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.2N 25.0W NEXT ADVISORY AT 09/2100Z $$ FORECASTER PASCH

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Tropical Storm Helene Graphics

2018-09-09 13:45:44| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Sun, 09 Sep 2018 11:45:44 GMT Wind Speed Probabilities last updated Sun, 09 Sep 2018 09:28:29 GMT

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Summary for Tropical Storm Helene (AT3/AL082018)

2018-09-09 13:43:43| National Hurricane Center (Atlantic)

...HELENE MOVING TO THE SOUTH OF THE CABO VERDE ISLANDS... As of 8:00 AM AST Sun Sep 9 the center of Helene was located near 13.2, -24.5 with movement W at 14 mph. The minimum central pressure was 997 mb with maximum sustained winds of about 65 mph.

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Tropical Storm Helene Public Advisory Number 8A

2018-09-09 13:43:43| National Hurricane Center (Atlantic)

Issued at 800 AM AST Sun Sep 09 2018 619 WTNT33 KNHC 091143 TCPAT3 BULLETIN Tropical Storm Helene Intermediate Advisory Number 8A NWS National Hurricane Center Miami FL AL082018 800 AM AST Sun Sep 09 2018 ...HELENE MOVING TO THE SOUTH OF THE CABO VERDE ISLANDS... SUMMARY OF 800 AM AST...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...13.2N 24.5W ABOUT 110 MI...180 KM S OF THE SOUTHERNMOST CABO VERDE ISLANDS MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 14 MPH...22 KM/H MINIMUM CENTRAL PRESSURE...997 MB...29.44 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Watch is in effect for... * The Cabo Verde islands of Santiago, Fogo, and Brava A Tropical Storm Warning is in effect for... * The Cabo Verde islands of Santiago, Fogo, and Brava 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. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 800 AM AST (1200 UTC), the center of Tropical Storm Helene was located near latitude 13.2 North, longitude 24.5 West. Helene is moving toward the west near 14 mph (22 km/h), and this motion is expected to continue through today. A turn toward the west-northwest is forecast to occur by Monday. Maximum sustained winds are near 65 mph (100 km/h) with higher gusts. Strengthening is forecast during the next couple of days, and Helene is expected to become a hurricane later today. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center. The estimated minimum central pressure is 997 mb (29.44 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions are expected within portions of the warning area today. Hurricane conditions are also possible in the southernmost Cabo Verde Islands today. RAINFALL: Helene is expected to produce total rain accumulations of 2 to 4 inches over the southern Cabo Verde Islands through today, with isolated maximum amounts of 6 inches. This rainfall may produce life-threatening flash floods. NEXT ADVISORY ------------- Next complete advisory at 1100 AM AST. $$ Forecaster Pasch

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