During the early afternoon of Saturday July 17, a squall line affected the grounds of the Olympic Stadium in the City of Mayaguez, where the Opening Ceremony for the the Mayaguez 2010 Central American Games was to be held later during the afternoon. The squall line reached the city of Mayaguez,  producing strong gusty winds that  downed a scaffold equipped with lighting equipment at the Isidoro Garcia Park, near the Mayaguez coast. Several persons were injured and some vehicles were damaged as the platform fell to the ground. Downed trees and power lines were reported in several municipalities of western Puerto Rico. Officials were forced to delay the Opening Ceremony.The NOS-NWLON sensor at the Penuelas-Guayanilla Bay reported a wind gust to 53 mph at 12:17 pm as the squall line moved through. The Cabo Rojo National Wildlife Refuge sensor recorded at wind gust to 48 mph at 1:14 pm. Data from the Puerto Rico Electric Power Company (PREPA) wind sensor at El Mani site near the Mayaguez airport, indicated wind gusts of around 33 mph at 1230 pm, 36 mph at 1245 pm, and 30 mph at 1:00 pm. The PREPA net highest wind gust was recorded at La Parguera sensor in Lajas where a 46 mph gust was recorded around 12 noon. Other locations in Puerto Rico recorded wind gusts that varied from 35-45 mph. Initial local and national media reports attributed this wind event to a tornado or a waterspout that had moved inland. However, most of the evidence indicates that it was an outflow boundary that propagated from the east southeast to the west northwest.

Thunderstorm Wind in MAYAGUEZ, PUERTO RICO
From 17-JUL-10 12:20:00 to 17-JUL-10 12:20:00 (AST-4)
Location: MAYAGUEZ
Magnitude: 40.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A number of power poles and trees were reported down.

Thunderstorm Wind in PENUELAS, PUERTO RICO
From 17-JUL-10 12:17:00 to 17-JUL-10 12:17:00 (AST-4)
Location: PENUELAS
Magnitude: 46.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

The Penuelas Guayanilla NOS NWLON weather sensor recorded sustained winds of 41 mph with gusts to 53 mph from the south at 12:17 PM, as a squall line moved west northwest. Sustained winds from 33-38 mph with gusts between 38-47 mph were recorded between 12:27 -13:08 AST from the south and south southeast.

Thunderstorm Wind in MAYAGUEZ, PUERTO RICO
From 17-JUL-10 13:08:00 to 17-JUL-10 13:08:00 (AST-4)
Location: MAYAGUEZ
Magnitude: 28.00 MG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Mesonet

A 32 mph wind gust from the south southeast was recorded at the PRSN MGZP4 station in Mayaguez as a squall line moved west northwest. Downed trees were reported along roads PR 308, PR 100, PR 108, and PR 102.

Thunderstorm Wind in MAYAGUEZ, PUERTO RICO
From 17-JUL-10 12:45:00 to 17-JUL-10 12:45:00 (AST-4)
Location: MAYAGUEZ
Magnitude: 45.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong gusty winds downed a scaffold equipped with lightning equipment at the Olympic Stadium along road 102 in Mayaguez. Seven persons were reported injured and some automobiles were damaged as the scaffold fell down.

Thunderstorm Wind in MAYAGUEZ, PUERTO RICO
From 17-JUL-10 13:20:00 to 17-JUL-10 13:20:00 (AST-4)
Location: MAYAGUEZ
Magnitude: 35.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A downed tree was reported along highway 100 in Mayaguez besides the Westernbank.

Thunderstorm Wind in LAJAS, PUERTO RICO
From 17-JUL-10 13:00:00 to 17-JUL-10 13:00:00 (AST-4)
Location: LAJAS
Magnitude: 45.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line produced strong winds at La Parguera.

Thunderstorm Wind in ARECIBO, PUERTO RICO
From 17-JUL-10 13:28:00 to 17-JUL-10 13:28:00 (AST-4)
Location: ARECIBO
Magnitude: 23.00 MG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Mesonet

Southeast winds gusting to 26 mph were recorded at the NDBC AROP4 station in Arecibo.

Thunderstorm Wind in CABO ROJO, PUERTO RICO
From 17-JUL-10 13:14:00 to 17-JUL-10 13:14:00 (AST-4)
Location: CABO ROJO
Magnitude: 42.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

The Cabo Rojo RAWS station at the National Wildlife Refuge recorded a sustained wind of 29 mph with a gust to 48 mph from the east southeast at 1:14 pm and 1:43 pm. Several wind gusts between 42-45 mph were recorded between 2:34-3:43 pm. A downed tree was reported by emergency along road 308 in Cabo Rojo.