Flood and Heavy Rain in Florida, August 11, 2019

Name: Flood and Heavy Rain in Florida, August 11, 2019
Start: 2019-08-11T17:30
End: 2019-08-11T22:32
Location: Florida

August 11, 2019 · NWS JAX · 4 events in 2 counties and zones

High moisture content combined with weak upper level forcing and warm conditions aloft favored locally heavy rainfall in sea breeze and outflow triggered showers and thunderstorms.

Where it happened

Every event with a place to put it. 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: None recorded
Crop damage: None recorded
Events: 4

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.

High moisture content combined with weak upper level forcing and warm conditions aloft favored locally heavy rainfall in sea breeze and outflow triggered showers and thunderstorms.

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 Aug 11, 2:09 PM EST, 3 hours 21 minutes earlier.

Area forecast discussion, Aug 11, 2:09 PM EST, 3 hours 21 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
309 PM EDT Sun Aug 11 2019

.NEAR TERM /Through Tonight/...
Fairly similar environment this afternoon compared to yesterday,
so expecting good coverage of showers and storms, with isolated
strong/severe with strong wind gusts. Activity should move slowly
E or SE given weak W to NW steering flow aloft. Will continue heat
advisory this afternoon until 6pm, when heat index values drop as
temperatures start to drop.

Like last night, expect convective precipitation to last through
about Midnight, then partly cloudy skies with low temperatures in
the mid 70s inland, upper 70s coast.

.SHORT TERM /Monday through Tuesday night/...
Strong upper ridge aloft will be stationary over southern Plains
and Gulf Coast states during this period. Surface trough of low
pressure will remain along FL/GA border, while daily sea breezes
push well inland both days. These boundaries should support
scattered to numerous showers and thunderstorms during the
afternoon and evening hours, some with very heavy rainfall and
strong winds. Focusing highest POPs where these boundaries merge.

Latest guidance suggests slightly lower high temperatures each day
eastern counties, though still quite hot interior areas with
upper ridge over the area. Heat index values will approach heat
advisory criteria midday before potentially some slight mix-down
of dew points in the afternoon. Will hold off on advisory issuance
to let night shift look at latest guidance. Expect slightly above
normal temperatures this period, especially at night buoyed by
abnormally high dew points.

.LONG TERM /Wednesday through Sunday/...
As we've seen throughout the warm season, upper pattern reverts
back to western ridge/eastern trough during this period, though
by the weekend, upper trough shifts off east coast as upper ridge
expands eastward across central U.S. Generally near or slightly
above normal temperatures this period.

Looks fairly stormy this period with weak upper troughing over
our area, re-establishing surface trough of low pressure over
central GA, which along with sea breezes will promote scattered
to numerous afternoon showers/storms each day.

&&

.AVIATION...VFR conditions are expected through this evening,
except locally lower conditions with strong winds expected with
scattered to numerous showers/storms Monday afternoon. Similar
to early this morning, could see areas of MVFR/IFR CIGs develop,
particularly across ne FL.

&&

.MARINE...High pressure will remain well east of the waters, with
low pressure to the west, maintaining a daily southerly flow
across the waters, with more southeasterly flow each afternoon
nearshore with sea breeze. Winds and seas are expected to remain
below advisory criteria this forecast period.

Rip Currents: Moderate risk ne FL, Low risk se GA.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  76  93  74  95 /  30  40  20  20
SSI  78  90  78  90 /  20  30  10  20
JAX  76  92  76  92 /  40  50  20  40
SGJ  76  90  76  90 /  30  50  20  50
GNV  76  92  75  92 /  50  70  40  60
OCF  76  92  75  90 /  30  60  30  60

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Heat Advisory until 6 PM EDT this evening for Baker-Bradford-
     Central Marion-Clay-Coastal Duval-Coastal Flagler-Coastal
     Nassau-Coastal St. Johns-Eastern Alachua-Eastern Marion-
     Gilchrist-Hamilton-Inland Duval-Inland Flagler-Inland
     Nassau-Inland St. Johns-Northern Columbia-Putnam-Southern
     Columbia-Suwannee-Union-Western Alachua-Western Marion.

GA...Heat Advisory until 6 PM EDT this evening for Appling-Atkinson-
     Bacon-Brantley-Clinch-Coastal Camden-Coastal Glynn-Coffee-
     Echols-Inland Camden-Inland Glynn-Jeff Davis-Northeastern
     Charlton-Northern Ware-Pierce-Southern Ware-Wayne-Western
     Charlton.

AM...None.
&&

Wolf/Cordero/Bricker

In the hours before

Special weather statement, Aug 11, 4:08 PM EST, 1 hour 22 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
508 PM EDT Sun Aug 11 2019

FLZ024-GAZ152-153-165-264-364-112200-
Inland Nassau FL-Northeastern Charlton GA-Inland Glynn GA-
Inland Camden GA-Western Charlton GA-Brantley GA-
508 PM EDT Sun Aug 11 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN NASSAU...WESTERN
CAMDEN...WEST CENTRAL GLYNN...SOUTHEASTERN BRANTLEY AND EASTERN
CHARLTON COUNTIES UNTIL 600 PM EDT...

* At 505 PM EDT, Strong thunderstorms are are expected to develop
  near Hickox, or near Nahunta, and move southeast at 5-10 mph.

* Wind gusts up to 50 mph, excessive cloud-to-ground lightning, and
  minor flooding due to heavy rainfall is possible with this storm.

* Locations impacted include...
  Hilliard, Folkston, Woodbine, Callahan, Nahunta, Homeland, Hickox,
  Kings Ferry, St. George and Waverly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3050 8181 3036 8205 3036 8206 3126 8199
      3118 8167
TIME...MOT...LOC 2105Z 297DEG 7KT 3115 8193

CORLESS

Special weather statement, Aug 11, 4:28 PM EST, 1 hour 2 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
528 PM EDT Sun Aug 11 2019

GAZ136-152-153-112215-
Inland Glynn GA-Brantley GA-Wayne GA-
528 PM EDT Sun Aug 11 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN GLYNN...NORTHEASTERN
BRANTLEY AND SOUTHEASTERN WAYNE COUNTIES UNTIL 615 PM EDT...

* At 528 PM EDT, Doppler radar was tracking a strong thunderstorm
  near Gardi, moving east at 10 mph.

* Wind gusts up to 50 mph, excessive cloud-to-ground lightning, and
  minor flooding due to heavy rainfall is possible with this storm.

* Locations impacted include...
  Gardi, Everett, Thalmann and Mount Pleasant.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3157 8170 3154 8168 3154 8167 3153 8167
      3153 8165 3151 8166 3147 8161 3145 8163
      3144 8161 3142 8160 3126 8170 3136 8195
      3157 8182
TIME...MOT...LOC 2128Z 288DEG 7KT 3145 8179

CORLESS

Special weather statement, Aug 11, 4:29 PM EST, 1 hour 1 minute before

Special Weather Statement
National Weather Service Jacksonville FL
529 PM EDT Sun Aug 11 2019

FLZ033-112200-
Inland St. Johns FL-
529 PM EDT Sun Aug 11 2019

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL ST. JOHNS COUNTY
UNTIL 600 PM EDT...

* At 529 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near Picolata, or 10 miles southeast
  of Green Cove Springs, moving northwest at 15 mph.

* Wind gusts up to 50 mph, excessive cloud-to-ground lightning, and
  minor flooding due to heavy rainfall is possible with this storm.

* Locations impacted include...
  World Golf Village, Picolata and Bakersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2985 8139 2979 8149 2988 8160 2990 8161
      2992 8161 2993 8160 2997 8161 3002 8169
      3011 8153 3010 8150 3004 8149 2997 8145
      2993 8142
TIME...MOT...LOC 2129Z 147DEG 14KT 2991 8152

HESS

Special weather statement, Aug 11, 5:00 PM EST, 30 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
600 PM EDT Sun Aug 11 2019

FLZ024-GAZ152-165-264-112245-
Inland Nassau FL-Northeastern Charlton GA-Inland Camden GA-
Brantley GA-
600 PM EDT Sun Aug 11 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN NASSAU...WESTERN
CAMDEN...SOUTHEASTERN BRANTLEY AND NORTHEASTERN CHARLTON COUNTIES
UNTIL 645 PM EDT...

* At 600 PM EDT, Doppler radar was tracking a strong thunderstorm
  near Woodbine, moving southeast at 10 mph.

* Wind gusts up to 50 mph, excessive cloud-to-ground lightning, and
  minor flooding due to heavy rainfall is possible with this storm.

* Locations impacted include...
  Hilliard, Woodbine, Callahan, Nahunta, Kings Ferry, Waverly, Nassau
  Village-Ratliff and Tarboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3051 8181 3041 8200 3078 8199 3078 8198
      3080 8199 3125 8198 3116 8176 3107 8170
TIME...MOT...LOC 2200Z 300DEG 11KT 3101 8180

CORLESS

Special weather statement, Aug 11, 5:13 PM EST, 17 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
613 PM EDT Sun Aug 11 2019

FLZ031-032-037-112300-
Putnam FL-Bradford FL-Clay FL-
613 PM EDT Sun Aug 11 2019

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL BRADFORD...NORTH
CENTRAL PUTNAM AND SOUTHERN CLAY COUNTIES UNTIL 700 PM EDT...

* At 612 PM EDT, Doppler radar was tracking a strong thunderstorm
  near Camp Blanding, or 7 miles south of Middleburg, moving
  southeast at 5 mph.

* Wind gusts up to 50 mph and excessive cloud-to-ground lightning
  possible with this storm.

* Locations impacted include...
  Starke, Keystone Heights, Middleburg, George's Lake, Kingsley, Camp
  Blanding, Penney Farms and Hampton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 2973 8177 2979 8208 2981 8212 2983 8214
      2984 8217 2996 8215 3006 8191 2995 8166
TIME...MOT...LOC 2212Z 300DEG 5KT 2994 8190

CORLESS

Special weather statement, Aug 11, 5:24 PM EST, 6 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
624 PM EDT Sun Aug 11 2019

FLZ037-112315-
Putnam FL-
624 PM EDT Sun Aug 11 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PUTNAM COUNTY UNTIL
715 PM EDT...

* At 624 PM EDT, Doppler radar was tracking a strong thunderstorm
  over San Mateo, or near East Palatka, moving southeast at 15 mph.

* Wind gusts up to 50 mph, excessive cloud-to-ground lightning, and
  minor flooding due to heavy rainfall is possible with this storm.

* Locations impacted include...
  Palatka, Crescent City, Pomona Park, East Palatka, San Mateo,
  Satsuma and Lake Como.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 2937 8149 2956 8173 2972 8163 2962 8153
      2949 8152 2948 8151
TIME...MOT...LOC 2224Z 316DEG 13KT 2959 8159

CORLESS

The radar

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

Open the radar archive at this moment

Event by event

3 heavy rain, 1 flood. Local standard time, as filed.

Heavy Rain, Duval

When: August 11, 5:30 PM EST to 7:30 PM EST
Where: Duval County, 0.69 mi N of Wesconnett
Reported by: CoCoRaHS
Coordinates: 30.260, -81.750

An observer measured 2.99 inches of rainfall in 2 hours.

Flood, Duval

When: August 11, 7:12 PM EST
Where: Duval County, 1.59 mi SE of Jacksonville to 1.56 mi SE of Jacksonville
Cause: Heavy Rain
Reported by: Social Media
Coordinates: 30.333, -81.653

About 6 inches of water was flowing over the intersection of Market and Orange Streets near Hogan's Creek.

Heavy Rain, Alachua

When: August 11, 8:33 PM EST to 10:07 PM EST
Where: Alachua County, 2.27 mi NW of Phifer
Reported by: Public
Coordinates: 29.720, -82.400

A public weather station measured 4.39 inches in 90 minutes.

Heavy Rain, Alachua

When: August 11, 8:58 PM EST to 10:32 PM EST
Where: Alachua County, 1.93 mi ESE of Spring Hill
Reported by: Public
Coordinates: 29.820, -82.500

A public station measured 3.06 inches of rainfall in the past 90 minutes.

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.

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

The same day elsewhere

Every storm in Florida in 2019 Every state in 2019 This day in weather history Warnings in Florida, August 2019

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: 843286, 843285, 843287, 843288.