On August 14, 2008, a strong tropical wave and its associated low pressure moved across the northeast Caribbean, passing westward across the U. S. Virgin Islands during the late afternoon and early evening hours, and then across Puerto Rico during the overnight and morning hours of August 15, 2008. Some of the outer rain bands ahead of the wave reached into Puerto Rico but they were sort of scattered. It was not until the late evening and after midnight that the heavy showers and thunderstorms moved into Puerto Rico. Overnight radar estimates indicated 2 to 3 inches in the municipalities of Ceiba, Fajardo, and Naguabo, with estimates of 2 to 4 inches between Cayey and Salinas. USGS gages indicated the highest 24 hour rainfall accumulation of around 4 inches at Rio Portuguez Ponce below the damsite, ending at 145 pm Friday. A few small isolated areas along the extreme southern coast of Puerto Rico were estimated by the Doppler radar to have received 6-7 inches during the overnight hours. About 15 roads were reported flooded and one closed to traffic due to river Rio Loco overflowing its banks in Yauco municipality. Some downed tree limbs were reported. 11 thousand customers were without electric power and 5 thousand without water. Small landslides were reported over the central interior in Utuado. About 13 local flights to nearby islands were canceled. For most of the residents, this tropical wave was extremely beneficial. Puerto Rico, Culebra, Vieques, were very dry, with one of the driest summers recorded on record through the beginning of August. As this system exited Puerto Rico and moved across the Mona Passage on the afternoon of the 15th, this area of disturbed weather became Tropical Storm Fay.

Heavy Rain in SAN JUAN AND VICINITY, PUERTO RICO
From 15-AUG-08 02:00:00 to 15-AUG-08 07:00:00 (AST-4)
Location: SAN JUAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Periods of heavy rain with low visibilities were recorded at the San Juan airport. Light rain began around 2300 AST on the 14th of August and varied between light and moderate through the night and ended around 1100 AST on the 15th of August. Rainfall accumulations of around 2.27 inches were recorded.

Debris Flow in NORTHEAST, PUERTO RICO
From 15-AUG-08 04:30:00 to 15-AUG-08 04:30:00 (AST-4)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A landslide was reported along road PR 975 near Las Calderonas in Ceiba. Two vehicles were trapped but no one was injured.

Heavy Rain in SAN JUAN AND VICINITY, PUERTO RICO
From 15-AUG-08 11:00:00 to 15-AUG-08 13:02:00 (AST-4)
Location: CATANO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road PR28 was flooded near the Julio Monagas Park in Bayamon.

Heavy Rain in NORTHEAST, PUERTO RICO
From 15-AUG-08 11:00:00 to 15-AUG-08 11:00:00 (AST-4)
Location: HUMACAO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road 31 along the Pitina Sector in Naguabo was reported flooded.

Flash Flood in NORTHEAST, PUERTO RICO
From 15-AUG-08 04:30:00 to 15-AUG-08 06:30:00 (AST-4)
Location: LUQUILLO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

River Fajardo overflowed its banks and flooded Highway 3 and its intersection with PR-53 at Barrio Cilito, traffic was blocked in both directions. A car and its occupant were overtaken by the flood waters but the person was rescued unharmed. During the height of the rain, the river increased its flow to approximately 10 feet, which is 2 feet above flood stage.

Debris Flow in NORTHEAST, PUERTO RICO
From 15-AUG-08 04:30:00 to 15-AUG-08 04:30:00 (AST-4)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A segment of road PR 194 in front of Plaza Fajardo collapsed as a van passed over and ditched into the crater.

Heavy Rain in NORTHEAST, PUERTO RICO
From 15-AUG-08 11:00:00 to 15-AUG-08 13:08:00 (AST-4)
Location: LOIZA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road 951 from Canovanas to Loiza was reported flooded.

Flood in PONCE AND VICINITY, PUERTO RICO
From 15-AUG-08 11:00:00 to 15-AUG-08 11:00:00 (AST-4)
Location: YAUCO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road 368 in Yauco municipality was closed to traffic due to river Rio Loco overflowing its banks.