A collision of three boundaries including the east coast sea breeze moving inland, and two outflow boundaries, one from the south and one from the west, converge under and intensifying thunderstorm over the Fort Caroline area. Rapid convergence and uplift spawned a brief tornado which caused structural damage to an apartment complex and widespread tree and some roof damage to homes in the area. One injury occurred. The slow storm motion also produced significant rainfall amounts, with caused flooding from Arlington toward the Mayport.

Flood in DUVAL, FLORIDA
From 01-AUG-13 15:30:00 to 01-AUG-13 17:00:00 (EST-5)
Location: (CRG)CRAIG FLD JACKS
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Neighborhoods started to have flooded roadways along Atlantic Blvd, east of Interstate 95 around 4:30 pm local time. Also, an off duty NWS employee reported 3 inches of water near the Town and Country Shopping Center in Arlington. By 4:45 pm, knee deep water was reported at the Singleton's Seafood Restaurant near Mayport. There was an estimated 3 inches of rainfall within 15 minutes (4:15pm-4:30 pm). By 5 pm, the public relayed a report that the intersection of Beach Blvd and University Blvd South was inundated with water. The cost of damage was estimated for inclusion of the event in Storm Data, and it is likely grossly underestimated.

Heavy Rain in DUVAL, FLORIDA
From 01-AUG-13 15:55:00 to 01-AUG-13 15:55:00 (EST-5)
Location: ARLINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The public measured 2.5 inches of rainfall in Arlington.

Thunderstorm Wind in DUVAL, FLORIDA
From 01-AUG-13 15:40:00 to 01-AUG-13 15:40:00 (EST-5)
Location: FT CAROLINE SHRS
Magnitude: 60.00 EG
Reported by: NWS Employee

Numerous trees were blown down at Mt. Pleasant Road and Spanish Point Drive.

Heavy Rain in DUVAL, FLORIDA
From 01-AUG-13 16:30:00 to 01-AUG-13 16:30:00 (EST-5)
Location: GREENFIELD
Reported by: Public

The public measured 4.5 inches of rainfall in the Ashely Wood Neighborhood (storm total).

Tornado in DUVAL, FLORIDA
From 01-AUG-13 15:15:00 to 01-AUG-13 15:25:00 (EST-5)
Location: COSMO
Tornado F-scale: EF1
Property damage: 500.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The sea breezes and several outflow boundaries converged over east Jacksonville Thursday afternoon around 4 pm...then the multicell cluster that developed drifted slowly eastward offshore of the Atlantic coast through 5:30 pm. Strong winds were reported with these storms, with the Naval Air Station in Jacksonville reporting a 41mph wind gust at 3:52pm). WFO Jacksonville conducted a storm survey Thursday evening and confirmed an upper end EF-1 tornado touched down in the Arlington area, ENE of downtown Jacksonville around 4:20 pm EDT along Monument Road and Derringer Road. The tornado briefly reached EF-1 intensity just south of Willowood Drive where it damaged an apartment complex. The Jacksonville Sheriff's office reported 5-6 homes were damaged and 15-20 structures were damaged. There was 1 injury associated with wind damage about 1 mile SW of the Fort Caroline area. The cost of damage was estimated.

Thunderstorm Wind in DUVAL, FLORIDA
From 01-AUG-13 15:25:00 to 01-AUG-13 15:25:00 (EST-5)
Location: COSMO
Magnitude: 80.00 EG
Reported by: Broadcast Media

Trees were blown down in the Fort Caroline area, south of Monument Road. The time of damage was based on radar.