A well organized tropical wave with an area of low pressure and significant thunderstorm activity moved offshore the African coastline on August 9th.  The system moved northwest until reaching the southern Cape Verde Islands, then turned westward out into the open Atlantic.  The system was upgraded to a tropical depression on August 11th, but easterly vertical wind shear kept the system from strengthening, and led to a reduction of thunderstorm activity which devolved the system into a remnant low pressure area on the 13th.  By the 14th, the system redeveloped thunderstorm activity and redeveloped into a tropical depression, which strengthened into a tropical storm early on the 15th well to the east of the Lesser Antilles. Late on the 15th, a tropical storm watch was issued for the U.S. Virgin Islands, when the system was located about 910 miles east southeast of Saint Croix.  At 5 am on the 16th, the tropical storm watch was extended to Puerto Rico, when the system was located about 850 miles southeast of San Juan. Soon afterwards, vertical wind shear from the west began to displace thunderstorms east and northeast of the center, beginning Ana's weakening trend.  Also, the high pressure system steering Ana caused the system to accelerate westward. The weakening tropical storm Ana crossed the Lesser Antilles, and was downgraded to a tropical depression on the 16th at 5 pm, when it was located about 440 miles east southeast of Saint Croix. In spite of this, the tropical storm watch was kept in effect in case of any unexpected changes. Ana's local effects were mainly periods of heavy rain, gusty winds and cloud to ground lightning. Urban flooding, fallen trees, downed power poles and lines, rock slides, and power and water utility interruptions in several places.  During the day on the 17th, aircraft reconnaissance determined that the system had dissipated southwest of Puerto Rico, as it no longer had a low-level circulation. At 5 pm, on the 17th, the tropical storm watch was discontinued for the U.S. Virgin Islands and Puerto Rico.

Tropical Depression in SOUTHEAST, PUERTO RICO
From 17-AUG-09 05:00:00 to 17-AUG-09 05:00:00 (AST-4)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

NOAA NOS Yabucoa Station indicated a wind gust of 42 mph from the east in association with Tropical Depression Ana.

Heavy Rain in SAN JUAN, PUERTO RICO
From 17-AUG-09 07:46:00 to 17-AUG-09 07:46:00 (AST-4)
Location: SAN JUAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Baldorioty de Castro Avenue was reported flooded between San Jorge and Del Parque streets.

Heavy Rain in TOA ALTA, PUERTO RICO
From 16-AUG-09 12:12:00 to 16-AUG-09 15:20:00 (AST-4)
Location: TOA ALTA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Street flooding was reported by 911 in Rio El Mandril sector of Toa Alta.

Heavy Rain in CAROLINA, PUERTO RICO
From 17-AUG-09 11:46:00 to 17-AUG-09 11:46:00 (AST-4)
Location: CAROLINA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Street flooding was reported by 911 near the school by Laguna Gardens, Baldorioty Avenue.

Tropical Depression in NORTHEAST, PUERTO RICO
From 17-AUG-09 10:06:00 to 17-AUG-09 10:06:00 (AST-4)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

NOAA NOS Fajardo Station (FRDP4) indicated a wind gust of 40 mph from the southeast in association with Tropical Depression Ana.