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BULLETIN
Tropical Storm Helene Advisory Number   6
NWS National Hurricane Center Miami FL       AL082018
500 PM AST Sat Sep 08 2018

...HELENE STRENGTHENING...
...TROPICAL STORM CONDITIONS EXPECTED TO REACH PORTIONS OF THE CABO
VERDE ISLANDS TONIGHT...


SUMMARY OF 500 PM AST...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...13.6N 21.7W
ABOUT 155 MI...250 KM SE OF PRAIA IN THE CABO VERDE ISLANDS
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...W OR 275 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES


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

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Watch is in effect for...
* The Cabo Verde islands of Santiago, Fogo, and Brava

A Tropical Storm Warning is in effect for...
* The Cabo Verde islands of Santiago, Fogo, and Brava

A Hurricane Watch means that hurricane conditions are possible
within the watch area, in this case within the next 24 to 36 hours.

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within the
next 24 to 36 hours.

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


DISCUSSION AND OUTLOOK
----------------------
At 500 PM AST (2100 UTC), the center of Tropical Storm Helene was
located near latitude 13.6 North, longitude 21.7 West. Helene is
moving toward the west near 13 mph (20 km/h), and this general
motion will likely continue through Sunday.  A gradual turn toward
the west-northwest with an increase in forward speed is expected
Sunday night through Tuesday.  On the forecast track, Helene will
pass very close to the southern Cabo Verde Islands tonight and early
Sunday.

Maximum sustained winds have increased to near 60 mph (95 km/h) with
higher gusts.  Additional strengthening is expected during the next
few days, and Helene is forecast to become a hurricane on Sunday.

Tropical-storm-force winds extend outward up to 60 miles (95 km)
from the center.

The estimated minimum central pressure is 998 mb (29.47 inches).


HAZARDS AFFECTING LAND
----------------------
WIND:  Tropical storm conditions are expected to first reach the
warning area during the next several hours.  Hurricane conditions
are possible in the southernmost Cabo Verde Islands on Sunday.

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


NEXT ADVISORY
-------------
Next intermediate advisory at 800 PM AST.
Next complete advisory at 1100 PM AST.

$$
Forecaster Beven

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