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Tropical Storm Helene Forecast Advisory Number 4

2018-09-08 10:50:34| National Hurricane Center (Atlantic)

Issued at 0900 UTC SAT SEP 08 2018 280 WTNT23 KNHC 080850 TCMAT3 TROPICAL STORM HELENE FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082018 0900 UTC SAT SEP 08 2018 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * SANTIAGO... FOGO... AND BRAVA A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA IN THIS CASE WITHIN THE NEXT 24 TO 36 HOURS. TROPICAL STORM CENTER LOCATED NEAR 13.7N 19.6W AT 08/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST OR 275 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1001 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT....... 0NE 30SE 70SW 0NW. 12 FT SEAS.. 30NE 60SE 120SW 0NW. 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 13.7N 19.6W AT 08/0900Z AT 08/0600Z CENTER WAS LOCATED NEAR 13.7N 18.9W FORECAST VALID 08/1800Z 13.9N 21.2W MAX WIND 50 KT...GUSTS 60 KT. 34 KT... 30NE 30SE 70SW 30NW. FORECAST VALID 09/0600Z 14.1N 23.5W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 20NE 20SE 20SW 20NW. 34 KT... 50NE 50SE 70SW 50NW. FORECAST VALID 09/1800Z 14.7N 26.3W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 30NE 30SE 30SW 30NW. 34 KT... 70NE 70SE 70SW 70NW. FORECAST VALID 10/0600Z 15.4N 29.3W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 25NE 20SE 15SW 20NW. 50 KT... 40NE 30SE 30SW 30NW. 34 KT... 90NE 70SE 70SW 80NW. FORECAST VALID 11/0600Z 17.2N 35.1W MAX WIND 80 KT...GUSTS 100 KT. 50 KT... 50NE 40SE 30SW 40NW. 34 KT...110NE 70SE 70SW 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 12/0600Z 19.0N 39.5W MAX WIND 70 KT...GUSTS 85 KT. OUTLOOK VALID 13/0600Z 22.0N 42.5W MAX WIND 65 KT...GUSTS 80 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.7N 19.6W NEXT ADVISORY AT 08/1500Z $$ FORECASTER ZELINSKY

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Tropical Storm Helene Graphics

2018-09-08 07:42:40| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Sat, 08 Sep 2018 05:42:40 GMT Wind Speed Probabilities last updated Sat, 08 Sep 2018 03:34:47 GMT

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Summary for Tropical Storm Helene (AT3/AL082018)

2018-09-08 07:42:32| National Hurricane Center (Atlantic)

...TROPICAL STORM HELENE FORECAST TO STRENGTHEN... ...TROPICAL STORM CONDITIONS EXPECTED TO REACH PORTIONS OF THE CABO VERDE ISLANDS TONIGHT... As of 2:00 AM AST Sat Sep 8 the center of Helene was located near 13.7, -18.9 with movement W at 13 mph. The minimum central pressure was 1002 mb with maximum sustained winds of about 40 mph.

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Tropical Storm Helene Public Advisory Number 3A

2018-09-08 07:42:32| National Hurricane Center (Atlantic)

Issued at 200 AM AST Sat Sep 08 2018 487 WTNT33 KNHC 080542 TCPAT3 BULLETIN Tropical Storm Helene Intermediate Advisory Number 3A NWS National Hurricane Center Miami FL AL082018 200 AM AST Sat Sep 08 2018 ...TROPICAL STORM HELENE FORECAST TO STRENGTHEN... ...TROPICAL STORM CONDITIONS EXPECTED TO REACH PORTIONS OF THE CABO VERDE ISLANDS TONIGHT... SUMMARY OF 200 AM AST...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...13.7N 18.9W ABOUT 375 MI...605 KM ESE OF THE SOUTHERNMOST CABO VERDE ISLANDS MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 13 MPH...20 KM/H MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Santiago, Fogo, and Brava A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area in this case within the next 24 to 36 hours. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 200 AM AST (0600 UTC) was located near latitude 13.7 North, longitude 18.9 West. Helene is moving toward the west near 13 mph (20 km/h), and a westward to west-northwestward motion with a gradual increase in forward speed is expected during the next 72 hours. On the forecast track, Helene will pass very close to the southern Cabo Verde Islands tonight and early Sunday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Some strengthening is forecast during the next 2 to 3 days, and Helene could become a hurricane early next week. Tropical-storm-force winds extend outward up to 70 miles (110 km). mainly to the south of the center. The estimated minimum central pressure is 1002 mb (29.59 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions are expected to first reach the warning area tonight or early Sunday. RAINFALL: Helene is expected to produce total rain accumulations of 3 to 5 inches, with maximum totals of 8 inches across the southern Cabo Verde Islands. This rainfall may produce life-threatening flash floods. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Zelinsky/Brown

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