A broad trough associated with a persistent surface low north of the area and a wide northeast to southwest swath of moisture south of Puerto Rico moved very slowly east and created a highly unstable environment across the local area. This instability led to the development of very strong thunderstorms. The thunderstorms first affected the municipality of Trujillo Alto then eventually spread north and east towards the northeast sections of Puerto Rico, producing pea to marble size hail, and isolated cases of quarter size hail at Villas de Carraizo, and strong gusty winds between 40 and 60 mph across several municipalities. Many downed trees were reported at and near the Outlets Mall parking in Canovanas, a few vehicles were damaged, as the trees fell on top. Other municipalities of the northeast like Fajardo reported numerous downed trees, pea size hail, and some homes with partial zinc roof damage.

Flash Flood in SAN JUAN, PUERTO RICO
From 14-MAY-11 15:36:00 to 14-MAY-11 16:30:00 (AST-4)
Location: SAN JUAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Barrio Obrero sector in Santurce, Kennedy Avenue, Barbosa Avenue, Munoz Rivera Avenue and the University Garden sector were reported flooded.

Thunderstorm Wind in FAJARDO, PUERTO RICO
From 14-MAY-11 14:45:00 to 14-MAY-11 15:00:00 (AST-4)
Location: FAJARDO
Magnitude: 53.00 MG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong gusty winds and pea size hail were reported in the municipality of Fajardo as a very strong thunderstorm moved from through from west to east. A few homes lost their zinc roof. Three persons at the Dos Marinas condo swimming pool were swept by the wind gusts. Two of them suffered minor face and arms bruises. Vehicular traffic across some of the local roads was blocked by snapped branches and fallen trees. Sustained winds of around 30 mph with gusts to 61 mph were measured by the Puerto Rico Electric Power Authority mesonet in Fajardo around mid afternoon.

Flood in TRUJILLO ALTO, PUERTO RICO
From 14-MAY-11 13:27:00 to 14-MAY-11 16:30:00 (AST-4)
Location: TRUJILLO ALTO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road 844 at Barrio Villas de Carraizo was reported flooded in the municipality of Trujillo Alto.

Heavy Rain in BAYAMON, PUERTO RICO
From 14-MAY-11 13:09:00 to 14-MAY-11 13:09:00 (AST-4)
Location: BAYAMON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

North Main Avenue was reported flooded near Plaza Del Sol shopping mall.

Heavy Rain in TRUJILLO ALTO, PUERTO RICO
From 14-MAY-11 13:29:00 to 14-MAY-11 16:30:00 (AST-4)
Location: TRUJILLO ALTO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported at Road 1, in Urb. Hacienda de Carraizo in Trujillo Alto.

Debris Flow in WESTERN INTERIOR, PUERTO RICO
From 14-MAY-11 13:46:00 to 14-MAY-11 13:46:00 (AST-4)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A mudslide was reported at Barrio Tanama, Road 526, Km 5.7 in the municipality of Adjuntas.

Flood in GUAYNABO, PUERTO RICO
From 18-MAY-11 13:54:00 to 18-MAY-11 16:45:00 (AST-4)
Location: GUAYNABO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road 165 near the federal prison was reported flooded in the municipality of Guaynabo.

Thunderstorm Wind in CANOVANAS, PUERTO RICO
From 14-MAY-11 14:18:00 to 14-MAY-11 14:28:00 (AST-4)
Location: CANOVANAS
Magnitude: 52.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Public

Strong gusty winds downed some trees and power poles in the west side of the parking lot of the Outlets Mall in Canovanas.  A few vehicles were damaged as the trees fell down. The strong winds also damaged a car dealer along Highway 3, and also downed road signs. Pea size hail was also reported.

Thunderstorm Wind in TRUJILLO ALTO, PUERTO RICO
From 14-MAY-11 14:15:00 to 14-MAY-11 14:30:00 (AST-4)
Location: TRUJILLO ALTO
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Strong gusty winds and pea size hail were reported in Barrio La Gloria in Trujillo Alto. Downed trees, bamboo trees,  and snapped branches were reported in Camino Culebra at Pellin Cruz, and in the Culebra sector of Barrio La Gloria Km. 2.2.