Several low level boundaries were across the local forecast area including a wake trough axis post-Isaias across south Georgia and an outflow boundary stalled near the I-95 corridor of NE FL. With daytime heating, high moisture content (PWAT 2 inches) and steeper mid level lapse rates (MU 7.4 degC), scattered strong to severe storms developed along and near the boundaries. Hazards included downbursts and hail.

Flash Flood in DUVAL, FLORIDA
From 04-AUG-20 20:50:00 to 04-AUG-20 20:50:00 (EST-5)
Location: JACKSONVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

McCoys creek flooded onto McCoys Creek Blvd. Some of the deepest water was at the King Street intersection.

Flood in DUVAL, FLORIDA
From 04-AUG-20 18:42:00 to 04-AUG-20 18:42:00 (EST-5)
Location: WHITEHOUSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Street flooding was observed between West Beaver Street and Chaffee Road to I-295.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:17:00 to 04-AUG-20 18:17:00 (EST-5)
Location: MARIETTA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was observed.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:25:00 to 04-AUG-20 18:25:00 (EST-5)
Location: MARIETTA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was observed in Marietta Subdivision.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:29:00 to 04-AUG-20 18:29:00 (EST-5)
Location: MARIETTA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Golf ball hail was observed.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:30:00 to 04-AUG-20 18:30:00 (EST-5)
Location: CAMBON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was observed at Westside Chandler Oaks.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:39:00 to 04-AUG-20 18:39:00 (EST-5)
Location: JACKSONVILLE HGTS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported in Jacksonville Heights.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:40:00 to 04-AUG-20 18:40:00 (EST-5)
Location: HERLONG ARPT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ping pong ball size hail was observed near Herlong Airfield.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:42:00 to 04-AUG-20 18:42:00 (EST-5)
Location: WHITEHOUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Quarter size hail was observed west of Normandy.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:57:00 to 04-AUG-20 18:57:00 (EST-5)
Location: HERLONG ARPT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Two inch size hail was observed near Crystal Springs Road.

Hail in DUVAL, FLORIDA
From 04-AUG-20 18:57:00 to 04-AUG-20 18:57:00 (EST-5)
Location: WHITEHOUSE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was observed in the Paradise Village Subdivision, just north of Beaver Street.

Heavy Rain in DUVAL, FLORIDA
From 04-AUG-20 18:00:00 to 04-AUG-20 19:30:00 (EST-5)
Location: CAMBON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A private weather station along Crystal Springs East measured 4.66 inches of rainfall in about 90 minutes.

Heavy Rain in DUVAL, FLORIDA
From 04-AUG-20 20:00:00 to 04-AUG-20 20:00:00 (EST-5)
Location: CEDAR HILLS
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Rainfall caused a roof to cave in at at Dunkin Donuts along Cassat Avenue. The cost of damage was unknown, but it was estimated for Storm Data.

Heavy Rain in DUVAL, FLORIDA
From 03-AUG-20 23:00:00 to 04-AUG-20 20:00:00 (EST-5)
Location: CAMBON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Daily rainfall total of 4.79 inches was measured at a rain gauge. Most occurred with evening thunderstorms.

Heavy Rain in DUVAL, FLORIDA
From 03-AUG-20 23:00:00 to 04-AUG-20 21:00:00 (EST-5)
Location: OTIS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public rain gauge measured a total of 3.87 inches. Most rain occurred during evening thunderstorms.

Heavy Rain in DUVAL, FLORIDA
From 03-AUG-20 23:00:00 to 04-AUG-20 21:00:00 (EST-5)
Location: CAMBON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public rain gauge measured a daily total of 4.12 inches of rain. Most occurred in the evening with thunderstorms.

Thunderstorm Wind in DUVAL, FLORIDA
From 04-AUG-20 19:10:00 to 04-AUG-20 19:10:00 (EST-5)
Location: ALDRIDGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A small tree was snapped with numerous tree limbs blown down. Damage occurred to a fence. The time of damage was based on radar.

Heavy Rain in PUTNAM, FLORIDA
From 03-AUG-20 23:00:00 to 04-AUG-20 19:00:00 (EST-5)
Location: FRUITLAND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public rain gauge measured a daily rain total of 2.65 inches. Most occurred with afternoon and evening thunderstorms.