It doesn't look like Erika will achieve hurricane status as the storm approaches the Caribbean - although it still may days from now as it nears the Bahamas (if the current forecast holds).
From the NHC:
TROPICAL STORM ERIKA INTERMEDIATE ADVISORY NUMBER 7A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL052015
200 PM AST WED AUG 26 2015
...ERIKA CONTINUES WESTWARD...
...NOAA HURRICANE HUNTER AIRCRAFT ON ITS WAY TO INVESTIGATE
SUMMARY OF 200 PM AST...1800 UTC...INFORMATION
ABOUT 245 MI...395 KM ESE OF ANTIGUA
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Saba and St. Eustatius
* St. Maarten
* St. Martin
* St. Barthelemy
* Antigua and Barbuda
* St. Kitts and Nevis
* Puerto Rico
* U.S. Virgin Islands
* British Virgin Islands
A Tropical Storm Watch is in effect for...
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, generally within 36
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
Interests in the Dominican Republic, the southeastern Bahamas, and
the Turks and Caicos Islands should monitor the progress of Erika.
A Tropical Storm Watch may be required for a portion of the
Dominican Republic later today.
For storm information specific to your area in the United
States, including possible inland watches and warnings, please
monitor products issued by your local National Weather Service
forecast office. For storm information specific to your area outside
the United States, please monitor products issued by your national
DISCUSSION AND 48-HOUR OUTLOOK
At 200 PM AST (1800 UTC), the center of Tropical Storm Erika was
located near latitude 16.3 North, longitude 58.2 West. Erika is
moving toward the west near 17 mph (28 km/h), and a west to
west-northwestward motion is expected over the next 48 hours.
On the forecast track, the center of Erika will move near or over
portions of the Leeward Islands tonight, move near the Virgin
Islands and Puerto Rico on Thursday, and be near or just north of
the north coast of the Dominican Republic on Friday.
Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Little change in strength is forecast during the next 48 hours.
Tropical storm force winds extend outward up to 105 miles (165 km)
primarily to the east of the center.
The estimated minimum central pressure is 1005 mb (29.68 inches).
HAZARDS AFFECTING LAND
WIND: Tropical storm conditions are expected to first reach the
warning area in the Leeward Islands tonight, and reach the Virgin
Islands and Puerto Rico on Thursday. Tropical storm conditions are
possible in the watch area tonight and early Thursday. Tropical
storm conditions could reach portions of the Dominican Republic on
RAINFALL: Erika is expected to produce total rain accumulations of
3 to 5 inches with maximum amounts of 8 inches across portions of
the Leeward Islands, the Virgin Islands, and Puerto Rico through
Next complete advisory at 500 PM AST.