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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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