A deepening upper level trough over the southeast region lifted a deep plume of tropical moisture over the forecast area. A strong low level 850 mb jet of 50-55 knots was in place. Backing winds advected instability inland from the Gulf of Mexico across north Florida which coincided with the passing of a second pre-frontal squall line as it tracked across north Florida and Southeast Georgia in the afternoon. Low level storm relative helicities increased to 200-350 M2/S2. Widespread severe storms developed across the forecast area during the afternoon.

Thunderstorm Wind in HAMILTON, FLORIDA
From 13-AUG-08 12:40:00 to 13-AUG-08 12:40:00 (EST-5)
Location: JASPER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported trees blown down between Jasper and Jennings. Most of the damage was near Highway 41 North and State Road 6. The time of the event was based on radar.

Thunderstorm Wind in NASSAU, FLORIDA
From 13-AUG-08 13:45:00 to 13-AUG-08 13:45:00 (EST-5)
Location: HILLIARD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported a large tree blown down on a house on Orange Street in Hilliard.

Thunderstorm Wind in NASSAU, FLORIDA
From 13-AUG-08 14:00:00 to 13-AUG-08 14:00:00 (EST-5)
Location: CHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A retired NWS Employee reported several tree tops were snapped near the Weigh Station along Interstate 95. The time of the event was based on radar.

Thunderstorm Wind in DUVAL, FLORIDA
From 13-AUG-08 14:15:00 to 13-AUG-08 14:15:00 (EST-5)
Location: GILMORE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tree was uprooted and fell on a home on Blossom Ridge Drive North. The time of the event was based on radar.

Thunderstorm Wind in COLUMBIA, FLORIDA
From 13-AUG-08 13:00:00 to 13-AUG-08 13:00:00 (EST-5)
Location: WINFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down along State Road six and near the Agricultural Station.

Thunderstorm Wind in SUWANNEE, FLORIDA
From 13-AUG-08 12:44:00 to 13-AUG-08 12:44:00 (EST-5)
Location: LIVE OAK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winds estimated at 55 to 60 mph were rocking a spotters car at 1100 11th Street SW in Live Oak.

Thunderstorm Wind in NASSAU, FLORIDA
From 13-AUG-08 13:45:00 to 13-AUG-08 13:45:00 (EST-5)
Location: HILLIARD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A weeping willow tree was uprooted at 10 Aviation Lane at the FAA Control Center in Hilliard.

Lightning in DUVAL, FLORIDA
From 13-AUG-08 14:00:00 to 13-AUG-08 14:00:00 (EST-5)
Location: SOUTHSIDE ESTATES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a transformer at the corner of Atlantic and Monument Roads. The power lines caught fire and feel onto a car stopped at the traffic light. Two men rescued the driver of the car that was burning. A local gas station had to shut down their pumps due to the lightning fire. The victim did not suffer critical injuries.

Thunderstorm Wind in DUVAL, FLORIDA
From 13-AUG-08 14:15:00 to 13-AUG-08 14:15:00 (EST-5)
Location: GARDEN CITY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Trees were blown down near Interstate 295 and Duval Road. Additional trees were blown down near Biscayne. The time of the event was based on radar.

Thunderstorm Wind in DUVAL, FLORIDA
From 13-AUG-08 14:35:00 to 13-AUG-08 14:35:00 (EST-5)
Location: EGGLESTON HGTS
Magnitude: 50.00 EG
Property damage: 12.00M
Crop damage: 0.00K
Reported by: Utility Company

The Jacksonville Port Authority reported two large 125 foot tall container ship cranes collapsed at Blount Island Marine Terminal. Each container was 950 tons. A squall line was moving across the area when the collapsed occurred. The KJAX Doppler radar indicated 45 to 50 knot velocities at approximately 600 feet msl. Each crane cost $6 million.

Thunderstorm Wind in DUVAL, FLORIDA
From 13-AUG-08 14:35:00 to 13-AUG-08 14:35:00 (EST-5)
Location: OCEANWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous power lines were blown down across Eastern Duval county.

Thunderstorm Wind in ALACHUA, FLORIDA
From 13-AUG-08 16:02:00 to 13-AUG-08 16:02:00 (EST-5)
Location: NEWBERRY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous power lines were blown down in Newberry.