Flooding and Heavy Rain in Florida, September 11 to 12, 2024

Name: Flooding and Heavy Rain in Florida, September 11 to 12, 2024
Start: 2024-09-11T23:00
End: 2024-09-12T18:46
Location: Florida

September 11 to 12, 2024 · NWS JAX · 8 events in 3 counties and zones

Converging onshore flow under high moisture, upper diffluence and an approaching upper level trough continued to bring rounds of heavy, flooding rainfall.

Where it happened

Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $800
Crop damage: None recorded
Events: 8

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS JAX wrote it up.

Converging onshore flow under high moisture, upper diffluence and an approaching upper level trough continued to bring rounds of heavy, flooding rainfall.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before the first event at Sep 11, 8:53 PM EST, 2 hours 7 minutes earlier.

Area forecast discussion, Sep 11, 8:53 PM EST, 2 hours 7 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
953 PM EDT Wed Sep 11 2024

...New UPDATE...

.UPDATE...
Issued at 936 PM EDT Wed Sep 11 2024

For the latest NE FL and SE GA Daily Key Messages please visit:
https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf

Occasional showers will continue to stream onshore at times
through the rest of the night, mainly within about 20 to 30 miles
of the coast where a Flood Watch remains in effect. The
combination of rainfall runoff and the persistent onshore flow
also maintains criteria for a Coastal Flood Advisory for the St.
Johns River Basin from Jacksonville southward, which remains in
effect through at least high tide of Thursday. Temps bottom out
into the low to mid 70s inland, and upper 70s along the coast and
east of the St. Johns River.

&&

.SHORT TERM...
(Thursday through Friday night)
Issued at 214 PM EDT Wed Sep 11 2024

The frontal boundary that has been stalled, will become more of a
warm front extending across north central NE FL Thursday morning
from remains of Francine. As Francine remnants lifts well to
northwest of the area during the Thursday into Thursday night, this
boundary will slowly lift north to near the FL/GA line. The boundary
will then remain stalled, with high pressure to the northeast. An
area of low pressure will develop just to the east of the area over
the Atlantic waters along this boundary.

Above normal precipitation chances will continue this period,
especially during the day, due to diurnal heating contribution.

Highs will trend below normal Thursday, then near normal Friday.
Lows will be above normal both Thursday night and Friday night.

&&

.LONG TERM...
(Saturday through next Wednesday)
Issued at 214 PM EDT Wed Sep 11 2024

The frontal boundary will continue to linger over northern FL
through the weekend as low continues to the east northeast. This
pattern will continue the higher than normal precipitation chances
through at least the weekend.

There is more uncertainty heading into the first half of next week,
as the models are trending toward further developing the low into
what could become a tropical system, and moving it into the
Carolinas. At this point will trend toward scattered precipitation.
If the low does become tropical, and move inland far enough to the
north, drier air may wrap in behind it across the local area.

Temperatures will trend near to a little above normal this period.

&&

.AVIATION...
(00Z TAFS)
Issued at 719 PM EDT Wed Sep 11 2024

Periods of SHRA and MVFR ceilings will overall be the norm
through the rest of tonight as well as into the day on Thursday at
area terminals. IFR ceilings at times towards sunrise are also
expected for interior areas (VQQ and GNV), and cannot fully rule
out the possibility at the rest of Duval terminals. SHRA chances
continue Thursday for all, as well as breezy conditions towards
coastal sites. TSRA potential is overall pretty low, and only
confident enough to include VCTS at GNV for Thursday afternoon at
this time.

&&

.MARINE...
Issued at 214 PM EDT Wed Sep 11 2024

A frontal boundary will be over area through the weekend, with high
pressure to the northeast. An area of low pressure is expected to
develop over area waters on the front through the weekend, which may
strengthen as it moves to the north of area.

Rip Currents: High Risk through Thursday night

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  72  82  72  84 /  50  80  30  80
SSI  76  82  76  84 /  50  60  40  70
JAX  75  84  75  86 /  60  80  40  80
SGJ  77  85  77  87 /  60  80  30  70
GNV  72  86  73  86 /  40  80  20  80
OCF  74  88  74  89 /  40  70  10  80

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Flood Watch through Thursday evening for FLZ024-033-038-124-125-
     133-138-225-325-425.

     Coastal Flood Advisory until 8 PM EDT Thursday for FLZ033-038-
     132-137-325.

     High Rip Current Risk through late Thursday night for FLZ124-125-
     133-138.

GA...Flood Watch through Thursday evening for GAZ153-154-165-166.

     High Rip Current Risk through late Thursday night for GAZ154-166.

AM...Small Craft Advisory until 5 AM EDT Thursday for AMZ450-452-454-
     474.

     Small Craft Advisory until 5 AM EDT Friday for AMZ470-472.

&&

In the hours before

Local storm report, Sep 11, 8:41 PM EST, 2 hours 19 minutes before

Preliminary Local Storm Report
National Weather Service Jacksonville FL
941 PM EDT Wed Sep 11 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     Non-Tstm Wnd Dmg 2 SSW Arlington         30.31N 81.62W
09/11/2024                   Duval              FL   Broadcast Media

            Large Tree uprooted and fell on car.
            Saturated ground due to continuous rainfall
            from the past couple days is the likely
            cause. Time estimated by radar.

&&

AC

Local storm report, Sep 11, 9:25 PM EST, 1 hour 35 minutes before

Preliminary Local Storm Report
National Weather Service Jacksonville FL
1025 PM EDT Wed Sep 11 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0940 PM     Non-Tstm Wnd Gst 2 WNW Mayport           30.39N 81.44W
09/11/2024  M41 MPH          AMZ452             FL   Mesonet

            Mesonet station 1483W Fswn Jfrd Station 40.

&&

LEV

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

4 heavy rain, 2 flood, 2 strong wind. Local standard time, as filed.

Heavy Rain, Duval

When: September 11, 11:00 PM EST to September 12, 12:55 PM EST
Where: Duval County, (Jax)jacksnville Int
Reported by: ASOS
Coordinates: 30.500, -81.680

The KJAX ASOS measured 4.50 inches of daily rainfall thus far.

Heavy Rain, Nassau

When: September 12, 6:35 AM EST to 6:35 PM EST
Where: Nassau County, Fernandina Beach Arp
Reported by: AWOS
Coordinates: 30.620, -81.470

The AWOS station KFHB in Fernandina Beach measured 5.6 inches of rainfall in 12 hours.

Heavy Rain, Nassau

When: September 12, 6:46 AM EST to 6:46 PM EST
Where: Nassau County, 1.91 mi ESE of Fernandina Beach Arp
Reported by: Public
Coordinates: 30.610, -81.440

A public weather station in Fernandina Beach | measured 5.79 inches of rain over the past | 12 hours. Several surrounding gauges | measured 5+ inches of rain in a similar time | frame.

Heavy Rain, Nassau

When: September 12, 10:26 AM EST to 2:26 PM EST
Where: Nassau County, 0.91 mi SE of Wilson
Reported by: Public
Coordinates: 30.610, -81.620

A public weather station in Yulee measured | 5.36 inches of rain in about 4 hours. | Several other gauges nearby reported between | 4-5 inches of rain in the same period.

Flood, Duval

When: September 12, 1:16 PM EST to 3:00 PM EST
Where: Duval County, 1.38 mi E of Cosmo to 7.82 mi NW of Jacksonville
Cause: Heavy Rain
Reported by: Broadcast Media
Coordinates: 30.373, -81.497

At 2:16 pm, broadcast media reported flood waters entering Browns Creek Fish Camp during high tide resulting in the business closing for the day. The high tides combined with heavy rainfall to create total water flooding issues. At 2:55 pm, emergency management reported flooding along Lem Turner at the intersection of Terrell Road and Gerald Road. At 3:30 pm, broadcast media reported yards and roads were flooded around Yulee. At 6:49 pm, street flooding was reported along Sawpit Road.

At 3:47 pm, emergency management reported that a vehicle stuck due to flood waters near | Bainebridge Dr near Rachel Creek Drive. Multiple roads flooded in the Bainebridge neighborhood. The I-95 off ramp to Pecan Park Rd was flooded.

Strong Wind, Coastal Duval

When: September 12, 1:28 PM EST
Where: Coastal Duval forecast zone
Measured: 35 kt (40 mph) estimated gust
Property damage: $500
Reported by: Emergency Manager
Coordinates: 30.335, -81.648 (the zone’s center; the record gives no point)

Multiple trees and branches were blown down due to gusty onshore winds and showers and saturated grounds along Hecksher Drive. The cost of damage was estimated.

Strong Wind, Coastal Duval

When: September 12, 4:28 PM EST
Where: Coastal Duval forecast zone
Measured: 35 kt (40 mph) estimated gust
Property damage: $300
Reported by: Emergency Manager
Coordinates: 30.335, -81.648 (the zone’s center; the record gives no point)

Trees were blown down near East 22nd Street and Thelma Street and along Brick Road near West 27th Street. The cost of damage was estimated.

Flood, Duval

When: September 12, 4:45 PM EST
Where: Duval County, 1.92 mi ESE of East Mandarin to 2.04 mi ESE of East Mandarin
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 30.140, -81.600

Street flooding was reported along Julington Creek Drive.

What these are

Heavy Rain: Rainfall totals unusual for the place and season that did not produce a flood.
Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
Strong Wind: Non-thunderstorm winds below high wind criteria that nonetheless caused damage or casualties.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Florida in 2024 Every state in 2024 This day in weather history Warnings in Florida, September 2024

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1214466, 1214470, 1214469, 1214467, 1214478, 1214485, 1214490, 1214482.