An un-seasonal amplified upper level trough and attendant surface front moved into the forecast area during the afternoon and evening hours. Strong differential positive vorticity advection, high surface based instability, large CAPE in the hail growth zone and low level forcing spawned widespread severe storms. Aloft cool 500 mb around -10 degrees Celsius were noted and mid level dry air moved over the area, and both factors increased downdraft strength in storms.

Heavy Rain in DUVAL, FLORIDA
From 21-JUL-07 22:37:00 to 21-JUL-07 22:37:00 (EST-5)
Location: MARIETTA
Reported by: Trained Spotter

A spotter in the Normandy area measured 2.81 inches of rainfall in the afternoon and evening.

Thunderstorm Wind in NASSAU, FLORIDA
From 21-JUL-07 15:33:00 to 21-JUL-07 15:33:00 (EST-5)
Location: BRYCEVILLE
Magnitude: 50.00 EG
Reported by: Law Enforcement

Trees and power lines were blown down along Highway 301 near Bryceville.

Thunderstorm Wind in NASSAU, FLORIDA
From 21-JUL-07 15:20:00 to 21-JUL-07 15:20:00 (EST-5)
Location: BRYCEVILLE
Magnitude: 50.00 EG
Reported by: Emergency Manager

Large tree limbs and power lines were blown down along Highway 301 and Motts Road for 3-4 miles. Power outages were also reported.

Thunderstorm Wind in MARION, FLORIDA
From 21-JUL-07 15:40:00 to 21-JUL-07 15:40:00 (EST-5)
Location: SUMMERFIELD
Magnitude: 50.00 EG
Reported by: Law Enforcement

Trees and power lines were blown down over the road at the intersection of Southeast 107 Court and Southeast 132nd Place in Lake Weir. Trees and power lines were also blown down at 11890 Southeast Sunset Harbor Road in Lake Weir.

Thunderstorm Wind in DUVAL, FLORIDA
From 21-JUL-07 16:00:00 to 21-JUL-07 16:00:00 (EST-5)
Location: MARIETTA
Magnitude: 50.00 EG
Reported by: Fire Department/Rescue

Trees and power lines were blown down near Attleboro Road, about 2 miles west of the Normandy area.

Thunderstorm Wind in HAMILTON, FLORIDA
From 21-JUL-07 18:00:00 to 21-JUL-07 18:00:00 (EST-5)
Location: WHITE SPGS
Magnitude: 50.00 EG
Reported by: Law Enforcement

Trees were blown down in White Springs.

Thunderstorm Wind in PUTNAM, FLORIDA
From 21-JUL-07 18:30:00 to 21-JUL-07 18:30:00 (EST-5)
Location: BOSTWICK
Magnitude: 50.00 EG
Reported by: Law Enforcement

Power lines were blown down in Bostwick.

Wildfire in ST. JOHNS, FLORIDA
From 21-JUL-07 18:30:00 to 21-JUL-07 18:30:00 (EST-5)
Reported by: Law Enforcement

A lightning strike caused a temporary brush fire about 5 miles north of St. Augustine Airport.

Thunderstorm Wind in ST. JOHNS, FLORIDA
From 21-JUL-07 18:30:00 to 21-JUL-07 18:30:00 (EST-5)
Location: ELKTON
Magnitude: 50.00 EG
Reported by: Law Enforcement

Numerous trees were blown down in Elkton. Power lines were blown down near Hastings.

Hail in MARION, FLORIDA
From 21-JUL-07 21:00:00 to 21-JUL-07 21:00:00 (EST-5)
Location: MOSS BLUFF
Magnitude: 1.00 
Reported by: Trained Spotter

Dime to quarter size hail was reported in Moss Bluff.

Thunderstorm Wind in DUVAL, FLORIDA
From 21-JUL-07 16:20:00 to 21-JUL-07 16:20:00 (EST-5)
Location: DINSMORE
Magnitude: 50.00 EG
Reported by: Fire Department/Rescue

Trees and power lines were blown down near New Kings Road and Edgewood, both on the northwest side of Jacksonville.

Thunderstorm Wind in CLAY, FLORIDA
From 21-JUL-07 17:02:00 to 21-JUL-07 17:02:00 (EST-5)
Location: GREEN COVE SPGS
Magnitude: 50.00 EG
Reported by: Fire Department/Rescue

A roof was blown off of a home in Green Cove Springs.

Funnel Cloud in DUVAL, FLORIDA
From 21-JUL-07 19:02:00 to 21-JUL-07 19:11:00 (EST-5)
Location: FT GEORGE IS
Reported by: Fire Department/Rescue

Several reports of a funnel cloud were received between 802-811 pm local time. The cloud formed over the south end of Amelia Island over Nassau Sound. One report said that it touched down as a waterspout; another report said that the cloud lifted back up into the parent cloud.

Hail in MARION, FLORIDA
From 21-JUL-07 16:00:00 to 21-JUL-07 16:00:00 (EST-5)
Location: MOSS BLUFF
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dime and quarter size hail was reported in Moss Bluff.

Hail in CLAY, FLORIDA
From 21-JUL-07 16:45:00 to 21-JUL-07 16:50:00 (EST-5)
Location: HIBERNIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported penny size hail on Fleming Island around 545 pm local time. By 550 pm, quarter size hail was occurring over Highway 17 in Green Cove Springs. Thunderstorm winds also downed trees and caused roof damage in Green Cove around this time.

Thunderstorm Wind in ST. JOHNS, FLORIDA
From 21-JUL-07 17:15:00 to 21-JUL-07 17:15:00 (EST-5)
Location: ELWOOD
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees and large tree limbs were blown down about 5 miles southeast of Fruit Cove.

Thunderstorm Wind in PUTNAM, FLORIDA
From 21-JUL-07 17:30:00 to 21-JUL-07 17:30:00 (EST-5)
Location: FEDERAL PT
Magnitude: 50.00 EG
Reported by: Trained Spotter

Large tree limbs were blown down near Hastings. Tree limb diameters were 8-10 inches.

Thunderstorm Wind in ALACHUA, FLORIDA
From 21-JUL-07 17:40:00 to 21-JUL-07 17:40:00 (EST-5)
Location: ORANGE HGTS
Magnitude: 50.00 EG
Reported by: Trained Spotter

A spotter reported 4-5 large oak trees were blown across State Road 26, about 1 mile west of Orange Heights.

Thunderstorm Wind in CLAY, FLORIDA
From 21-JUL-07 16:30:00 to 21-JUL-07 16:50:00 (EST-5)
Location: ORANGE PARK
Magnitude: 52.00 EG
Reported by: Public

A downburst occurred over Orange Park and Fleming Island around 530 pm local time. At 530 pm, a former NWS employee in Orange Park reported a wall cloud with strong rotation. The cloud snapped tree tops in the neighborhood. A roof was also blown off a home on Arbor Circle Drive. By 532 pm, numerous trees were down in Doctors Inlet and Fleming Island. Trees were blown down across the CSX railroad tracks in Doctors Inlet and a gas station also suffered tree damage. At 540 pm, winds were gusting around 50 mph and pea size hail was reported on Fleming Island. Wind gusts snapped a pine tree which fell and damaged a screened room in Eagle Harbor. By 545 pm, widespread tree damage occurred on the southern tier of Fleming Island, south of Hibernia and north of Black Creek. Tree tops were snapped and blown off in Fleming Island Plantation, and some were blocking roads in the subdivision. Minor damage occurred to a mobile home on Floyd Street and a cabinet shop off of Ebb Tide Road and U.S. Highway 17 had roof damage. A portion of the baseball backstop at St. Johns Country Day School on Doctors Lake Drive was bent and several large trees on campus were snapped or uprooted.