A stalled front remains situated just to the northwest this morning with a light onshore flow near the surface while persistent southwesterly flow continues aloft. Cooler than normal mid-level temperatures created deeper instability that strengthened diurnally driven sea breeze storms as they develop along the east-coast sea breeze in the afternoon. Deeper moisture was across NE FL and portions of SE GA (generally south and east of Waycross) created more widespread storm coverage, especially along and west of the St Johns River basin as the sea breeze interacted with the river breeze.
Strong to marginally severe wind gusts of 40-60 mph occurred. Marginal deep layer shear was around 20 kts which create a lower end hail threat. Locally heavy rainfall occurred that created mainly nuisance minor flood issues.

Hail in ST. JOHNS, FLORIDA
From 11-SEP-23 17:05:00 to 11-SEP-23 17:05:00 (EST-5)
Location: RIVERDALE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was observed.

Heavy Rain in DUVAL, FLORIDA
From 11-SEP-23 14:59:00 to 11-SEP-23 15:59:00 (EST-5)
Location: (JAX)JACKSNVILLE INT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The KJAX ASOS at the Jacksonville International Airport measured 2.17 inches as of 4:59 pm and 1.99 inches fell within 1 hour.

Thunderstorm Wind in DUVAL, FLORIDA
From 11-SEP-23 15:31:00 to 11-SEP-23 15:31:00 (EST-5)
Location: (NIP)NAS JACKSONVILL
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS at NAS Jacksonville measured a wind gust of 61 mph.

Thunderstorm Wind in ST. JOHNS, FLORIDA
From 11-SEP-23 16:47:00 to 11-SEP-23 16:47:00 (EST-5)
Location: BAKERSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were snapped and fell on 13A north of Molasses Junction. The time of damage was based on radar.

Thunderstorm Wind in PUTNAM, FLORIDA
From 11-SEP-23 17:55:00 to 11-SEP-23 17:55:00 (EST-5)
Location: SAN MATEO
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Power lines were blown down at the intersection of 477 South and Highway 17.

Thunderstorm Wind in PUTNAM, FLORIDA
From 11-SEP-23 17:50:00 to 11-SEP-23 17:50:00 (EST-5)
Location: WELAKA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were blown down at the intersection of Elm Street and 11th Avenue.

Thunderstorm Wind in PUTNAM, FLORIDA
From 11-SEP-23 17:57:00 to 11-SEP-23 17:57:00 (EST-5)
Location: ORANGE MILLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were blown down.

Thunderstorm Wind in DUVAL, FLORIDA
From 11-SEP-23 15:25:00 to 11-SEP-23 15:25:00 (EST-5)
Location: CEDAR HILLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large strip mall sign was blown off causing significant damage to the roof of the store at the intersection of Blanding Blvd and Shirley Avenue.

Tornado in ST. JOHNS, FLORIDA
From 11-SEP-23 17:10:00 to 11-SEP-23 17:10:00 (EST-5)
Location: RIVERDALE
Tornado F-scale: EF0
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Social Media

The public reported a landspout near Molasses Junction. Images were shared showing   roof damage to the sheet metal and wooden structure pf a horse stable and an outdoor toilet blown over. The time of damage was based on radar.

Thunderstorm Wind in PUTNAM, FLORIDA
From 11-SEP-23 17:58:00 to 11-SEP-23 17:58:00 (EST-5)
Location: LUNDY
Magnitude: 45.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A power line was blown down at 1506 Husson Avenue. The cost of damage was unknown, but it was estimated for inclusion of the event in Storm Data.

Thunderstorm Wind in DUVAL, FLORIDA
From 11-SEP-23 15:30:00 to 11-SEP-23 15:30:00 (EST-5)
Location: VENETIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large tree was blown down onto a vehicle causing significant damage on Lofty Pine Circle. Several large trees were uprooted in Ortega and fell across roads and powerlines. A transformer was also blown down.

Thunderstorm Wind in DUVAL, FLORIDA
From 11-SEP-23 15:40:00 to 11-SEP-23 15:40:00 (EST-5)
Location: BOWDEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several large trees were snapped near the base of the trunk near St. Augustine Road near San Jose. Some trees blocked the roads. There was extensive damage to the San Jose Catholic School and the school had to be closed on Tuesday Sept. 12th. The time of damage was based on radar.

Thunderstorm Wind in DUVAL, FLORIDA
From 11-SEP-23 15:30:00 to 11-SEP-23 15:30:00 (EST-5)
Location: VENETIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tree was blown down off of Roosevelt Blvd near Timuquana Road. A hard top gazebo roof was also blown off. The time of damage was based on radar.