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Tropical Storm Helene Public Advisory Number 30A

2018-09-15 01:37:29| National Hurricane Center (Atlantic)

Issued at 800 PM AST Fri Sep 14 2018 314 WTNT33 KNHC 142337 TCPAT3 BULLETIN Tropical Storm Helene Intermediate Advisory Number 30A NWS National Hurricane Center Miami FL AL082018 800 PM AST Fri Sep 14 2018 ...HELENE EXPECTED TO BRING GUSTY WINDS AND HEAVY RAINS TO THE AZORES THIS WEEKEND... SUMMARY OF 800 PM AST...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...34.9N 36.4W ABOUT 585 MI...940 KM WSW OF LAJES AIR BASE IN THE AZORES MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...N OR 10 DEGREES AT 18 MPH...30 KM/H MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * All of the Azores Islands A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within 24 to 36 hours. Interests in the Ireland and United Kingdom should consult products from their local meteorological service for information about potential impacts from Helene in those locations. Local forecasts and warnings for the UK can be found on the website of the UK Met Office at https://www.metoffice.gov.uk/. Local forecasts and warnings for Ireland can be found on the website of Met Eireann at https://www.met.ie/. DISCUSSION AND OUTLOOK ---------------------- At 800 PM AST (0000 UTC), the center of Tropical Storm Helene was located near latitude 34.9 North, longitude 36.4 West. Helene is moving toward the north near 18 mph (30 km/h). A turn toward the north-northeast is forecast early Saturday followed by a turn toward the northeast by Sunday morning. On the forecast track, Helene will pass near or over the Azores late Saturday or Sunday. Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Little change in strength is forecast during the next 12 hours. Gradual weakening is expected over the weekend, and Helene should make the transition to an extratropical cyclone as it approaches Ireland and the United Kingdom. Tropical-storm-force winds extend outward up to 160 miles (260 km) from the center. The estimated minimum central pressure is 988 mb (29.18 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions are expected within the warning area by late Saturday. RAINFALL: Helene is expected to produce total rainfall amounts of 2 to 4 inches across the Azores, with isolated amounts up to 8 inches across the western Azores. This rainfall may cause life-threatening flash flooding. SURF: Swells generated by Helene are affecting portions of the Azores. These swells are likely to 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 Avila

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