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Tropical Storm Helene Intermediate Advisory Number 33A
NWS National Hurricane Center Miami FL AL082018
200 PM AST Sat Sep 15 2018
...TROPICAL STORM CONDITIONS ABOUT TO SPREAD ACROSS THE WESTERN
...HELENE EXPECTED TO PRODUCE TROPICAL-STORM-FORCE WINDS AND LOCALLY
HEAVY RAINS ACROSS THE AZORES...
SUMMARY OF 200 PM AST...1800 UTC...INFORMATION
ABOUT 95 MI...155 KM W OF FLORES ISLAND IN THE WESTERN AZORES
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...NE OR 45 DEGREES AT 21 MPH...33 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
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 12
to 24 hours.
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
DISCUSSION AND OUTLOOK
At 200 PM AST (1800 UTC), the center of Tropical Storm Helene was
located near latitude 39.5 North, longitude 33.0 West. Helene is
moving toward the northeast near 21 mph (33 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 pass near
or over the western Azores later today or tonight and then approach
Ireland and the United Kingdom Sunday night and Monday.
Maximum sustained winds are near 70 mph (110 km/h) with higher
gusts. Little change in strength is forecast today, but gradual
weakening is expected beginning tonight or on Sunday. Helene is
expected to transition to an extratropical cyclone as it approaches
Ireland and the United Kingdom.
Tropical-storm-force winds extend outward up to 185 miles (295 km)
from the center. Flores recently reported a wind gust of 44 mph
The estimated minimum central pressure is 988 mb (29.18 inches).
HAZARDS AFFECTING LAND
WIND: Tropical storm conditions are expected within portions of the
warning area within the next few hours. These conditions should
continue through tonight.
RAINFALL: Helene is expected to produce total rainfall amounts 1
to 2 inches across the far western Azores. Rainfall amounts of 1 to
2 inches (25 to 50 mm) are expected across western Ireland and
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 complete advisory at 500 PM AST.