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BULLETIN
Tropical Storm Helene Advisory Number   3
NWS National Hurricane Center Miami FL       AL082018
1100 PM AST Fri Sep 07 2018

...TROPICAL STORM HELENE FORMS BETWEEN THE COAST OF AFRICA AND THE
CABO VERDE ISLANDS...
...EXPECTED TO BRING TROPICAL STORM CONDITIONS TO PORTIONS OF THE
CABO VERDE ISLANDS SATURDAY NIGHT AND SUNDAY.


SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...13.6N 18.5W
ABOUT 405 MI...650 KM E OF THE SOUTHERNMOST CABO VERDE ISLANDS
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Tropical Storm Warning is in effect for...
* Santiago, Fogo, and Brava

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.

For storm information specific to your area, please monitor products
issued by your national meteorological service.


DISCUSSION AND OUTLOOK
----------------------
Satellite data indicate that the depression over the far eastern
Atlantic has strengthened and is now Tropical Storm Helene. The
center of the tropical storm is a little to the east of
previously indicated position, and at 1100 PM AST (0300 UTC) was
located near latitude 13.6 North, longitude 18.5 West. Helene is
moving toward the west near 12 mph (19 km/h), and a westward to
west-northwestward motion with a gradual increase in forward speed
is expected during the next 72 hours.  On this track, Helene will be
passing very close to the southern Cabo Verde Islands during
Saturday night and early Sunday.

Maximum sustained winds are near 40 mph (65 km/h) with higher gusts.
Some strengthening is forecast during the next 2 to 3 days, and
Helene could become a hurricane early next week.

Tropical-storm-force winds extend outward up to 70 miles (110 km).
mainly to the south of the center.

The estimated minimum central pressure is 1002 mb (29.59 inches).


HAZARDS AFFECTING LAND
----------------------
WIND:  Tropical storm conditions are expected to first reach the
warning area Saturday night or on Sunday.

RAINFALL:  Helene is expected to produce total rain accumulations of
3 to 5 inches, with maximum totals of 8 inches across the southern
Cabo Verde Islands.  This rainfall may produce life-threatening
flash floods.


NEXT ADVISORY
-------------
Next intermediate advisory at 200 AM AST.
Next complete advisory at 500 AM AST.

$$
Forecaster Avila

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