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Summary for Tropical Storm Helene (AT3/AL082018)

2018-09-16 10:42:11| National Hurricane Center (Atlantic)

...HELENE QUICKLY TRANSITIONING TO AN EXTRATROPICAL LOW... As of 5:00 AM AST Sun Sep 16 the center of Helene was located near 42.5, -28.4 with movement NE at 25 mph. The minimum central pressure was 993 mb with maximum sustained winds of about 50 mph.

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Tropical Storm Helene Public Advisory Number 36

2018-09-16 10:42:11| National Hurricane Center (Atlantic)

Issued at 500 AM AST Sun Sep 16 2018 940 WTNT33 KNHC 160842 TCPAT3 BULLETIN Tropical Storm Helene Advisory Number 36 NWS National Hurricane Center Miami FL AL082018 500 AM AST Sun Sep 16 2018 ...HELENE QUICKLY TRANSITIONING TO AN EXTRATROPICAL LOW... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...42.5N 28.4W ABOUT 270 MI...435 KM N OF FAIAL ISLAND IN THE CENTRAL AZORES MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...NE OR 50 DEGREES AT 25 MPH...41 KM/H MINIMUM CENTRAL PRESSURE...993 MB...29.33 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: None. Interests in Ireland and the 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 500 AM AST (0900 UTC), the center of Tropical Storm Helene was located near latitude 42.5 North, longitude 28.4 West. Helene is moving toward the northeast near 25 mph (41 km/h), and this motion is expected to continue with an increase in forward speed during the next couple of days. On the forecast track, Helene should move away from the Azores today and then approach Ireland and the United Kingdom tonight and Monday. Maximum sustained winds have decreased to near 50 mph (85 km/h) with higher gusts. Little, if any, change in strength is forecast, and Helene is expected to become an extratropical cyclone today. Tropical-storm-force winds extend outward up to 160 miles (260 km) from the center. The estimated minimum central pressure is 993 mb (29.33 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Winds should continue to abate in the Azores. morning. SURF: Swells generated by Helene are affecting portions of the Azores. These swells are likely to continue for another couple of days and could cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 AM AST. $$ Forecaster Roberts

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Tropical Storm Helene Wind Speed Probabilities Number 36

2018-09-16 10:42:11| National Hurricane Center (Atlantic)

Issued at 0900 UTC SUN SEP 16 2018 920 FONT13 KNHC 160842 PWSAT3 TROPICAL STORM HELENE WIND SPEED PROBABILITIES NUMBER 36 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082018 0900 UTC SUN SEP 16 2018 AT 0900Z THE CENTER OF TROPICAL STORM HELENE WAS LOCATED NEAR LATITUDE 42.5 NORTH...LONGITUDE 28.4 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 45 KTS...50 MPH...85 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 SUN 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 SUN 18Z SUN 06Z MON 18Z MON 06Z TUE 06Z WED 06Z THU PERIODS TO TO TO TO TO TO TO 18Z SUN 06Z MON 18Z MON 06Z TUE 06Z WED 06Z THU 06Z FRI FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER ROBERTS

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Tropical Storm Helene Forecast Advisory Number 36

2018-09-16 10:41:42| National Hurricane Center (Atlantic)

Issued at 0900 UTC SUN SEP 16 2018 355 WTNT23 KNHC 160841 TCMAT3 TROPICAL STORM HELENE FORECAST/ADVISORY NUMBER 36 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082018 0900 UTC SUN SEP 16 2018 THE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN IRELAND AND THE 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/ . TROPICAL STORM CENTER LOCATED NEAR 42.5N 28.4W AT 16/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 22 KT ESTIMATED MINIMUM CENTRAL PRESSURE 993 MB MAX SUSTAINED WINDS 45 KT WITH GUSTS TO 55 KT. 34 KT....... 70NE 140SE 100SW 60NW. 12 FT SEAS..150NE 270SE 330SW 240NW. 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 42.5N 28.4W AT 16/0900Z AT 16/0600Z CENTER WAS LOCATED NEAR 41.8N 29.6W FORECAST VALID 16/1800Z 44.5N 24.7W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. 34 KT...100NE 160SE 120SW 70NW. FORECAST VALID 17/0600Z 47.4N 18.1W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. 34 KT...120NE 170SE 150SW 90NW. FORECAST VALID 17/1800Z 50.8N 10.8W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. 34 KT...110NE 160SE 140SW 80NW. FORECAST VALID 18/0600Z 55.1N 3.7W...POST-TROP/EXTRATROP MAX WIND 40 KT...GUSTS 50 KT. 34 KT...110NE 160SE 140SW 80NW. FORECAST VALID 19/0600Z...ABSORBED BY A FRONT REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 42.5N 28.4W NEXT ADVISORY AT 16/1500Z $$ FORECASTER ROBERTS

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