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Tropical Storm Helene Intermediate Advisory Number 28A
NWS National Hurricane Center Miami FL       AL082018
800 AM AST Fri Sep 14 2018

...HELENE ACCELERATING NORTHWARD...
...EXPECTED TO BRING GUSTY WINDS AND HEAVY RAINS TO THE AZORES THIS
WEEKEND...


SUMMARY OF 800 AM AST...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...31.9N 36.7W
ABOUT 725 MI...1165 KM SW OF LAJES AIR BASE IN THE AZORES
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...N OR 10 DEGREES AT 23 MPH...37 KM/H
MINIMUM CENTRAL PRESSURE...992 MB...29.30 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, generally within 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 AM AST (1200 UTC), the center of Tropical Storm Helene was
located near latitude 31.9 North, longitude 36.7 West. Helene is
moving toward the north near 23 mph (37 km/h). A turn toward the
northeast is expected over the weekend. On the forecast track,
Helene will pass near or over the Azores late Saturday or Sunday.

Maximum sustained winds are near 65 mph (100 km/h) with higher
gusts.  Little change in strength is forecast during the next 48
hours. Gradual weakening is expected after Helene becomes a
post-tropical cyclone over the weekend.

Tropical-storm-force winds extend outward up to 140 miles (220 km)
from the center.

The estimated minimum central pressure is 992 mb (29.30 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 AM AST.

$$
Forecaster Roberts

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