Alert archive / Florida / Areal Flood Warnings in 2021

Areal Flood Warning 33, NWS Jacksonville, FL

July 7, 20214 counties in Florida; 4 counties in Georgia

NWS Jacksonville, FL issued this areal flood warning at Jul 7, 2021, 3:31 PM EDT for 4 counties in Florida; 4 counties in Georgia. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 7, 2021, 3:31 PM EDT (19:31 UTC)
Expired
Jul 7, 2021, 6:00 PM EDT
In force
2 hr
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Flood severity
None

Counties Baker County, FL, Clay County, FL, Duval County, FL, Nassau County, FL, Camden County, GA, Charlton County, GA, Clinch County, GA, Ware County, GA

The radar

The Jacksonville radar (KJAX), 37 km from the middle of the area, began a volume at 19:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 7.5 hours before the alert went out and 37 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2021-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1540 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2021-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1540 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
838 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, 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 this areal flood warning went out at Jul 7, 3:14 PM EDT, 17 minutes earlier.

Area forecast discussion, Jul 7, 3:14 PM EDT, 17 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
314 PM EDT Wed Jul 7 2021

...POTENTIAL FOR FLOODING AND ISOLATED TORNADOES WILL CONTINUE
THIS EVENING...

.NEAR TERM [Tonight through Thursday]...Tropical Storm Elsa over
the Suwannee Valley this afternoon will continue to move north
and into se Georgia this evening. This will continue the threat
of flooding rainfall with isolated tornadoes. Elsa will shift
north of the Altamaha River around midnight bringing a decrease to
the wind and rain for ne Fl/se Ga. Elsa will move into the Carolinas
on Thursday leaving a sw flow across our area. Scattered to numerous
showers and storms are expected by Thursday afternoon as a moist
unstable airmass remains over the area. Temperatures will reach
near 90 degrees Thursday afternoon.

.SHORT TERM [Thursday night through Saturday Night]...A moist sw
flow will prevail across the area with a ridge across south
Florida and troughing to the north. Scattered to numerous showers
and thunderstorms are expected each afternoon as PWATs will be in
the 1.75 to 2 inch range. Temperatures will be close to average
July levels.

.LONG TERM [Sunday Through Wednesday]...Deep layer ridge extending
from the western Atlantic across south Florida will drift north
into the area early next week. This will bring an increase in
temperatures with a decrease in rain chances. Enough moisture will
remain over the area for scattered diurnal seabreeze convection
each day. Temperatures and pops will be close to normal levels
through period.

&&

.MARINE...Tropical Storm Elsa will track northward across
northeast Florida and southeast Georgia through this evening,
moving north of the area around midnight. Strong winds and
elevated seas will continue overnight and then decrease on
Thursday.Advisory conditions will progress south to north across
across FL waters early this morning, with the best potential of
Tropical Storm force winds focused across the GA waters where a
Tropical Storm Warning remains in effect. Winds and seas decrease
trailing Elsa's departure to the northeast late tonight. High
pressure will build across central Florida Thursday through the
weekend bringing prevailing SSW winds.

Rip Currents: Moderate to High risk today and moderate risk on
Thursday as winds become offshore.

&&

.HYDROLOGY...Minor flooding expected on the Suwannee and St.
Marys Rivers with a rise into Moderate Flood currently forecast
for portion of the Santa Fe River.

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  73  86  73  87  72 / 100  70  20  50  10
SSI  76  87  77  89  76 /  90  60  20  40  10
JAX  74  89  74  88  74 /  80  60  20  50  10
SGJ  75  88  74  88  74 /  60  60  20  40  10
GNV  74  86  73  87  72 /  60  60  30  50  10
OCF  75  86  73  88  72 /  60  60  30  50  10

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Flood Watch until 2 AM EDT Thursday for Baker-Bradford-Central
     Marion-Coastal Duval-Coastal Flagler-Coastal Nassau-Coastal
     St. Johns-Eastern Alachua-Eastern Clay-Eastern Marion-
     Eastern Putnam-Gilchrist-Hamilton-Inland Flagler-Inland
     Nassau-Inland St. Johns-Northern Columbia-South Central
     Duval-Southern Columbia-Suwannee-Trout River-Union-Western
     Alachua-Western Clay-Western Duval-Western Marion-Western
     Putnam.

     Tropical Storm Warning for Baker-Bradford-Eastern Alachua-
     Gilchrist-Hamilton-Inland Nassau-Northern Columbia-Southern
     Columbia-Suwannee-Union-Western Alachua.

     High Rip Current Risk through late tonight for Coastal Duval-
     Coastal Flagler-Coastal Nassau-Coastal St. Johns.

     Wind Advisory until midnight EDT tonight for Coastal Duval-
     Coastal Flagler-Coastal Nassau-Coastal St. Johns-Eastern
     Clay-Eastern Putnam-Inland Flagler-Inland St. Johns-South
     Central Duval-Trout River-Western Clay-Western Duval-
     Western Putnam.

GA...Flood Watch until 2 AM EDT Thursday 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.

     Tropical Storm Warning for Brantley-Clinch-Coastal Camden-
     Coastal Glynn-Echols-Inland Camden-Inland Glynn-
     Northeastern Charlton-Northern Ware-Pierce-Southern Ware-
     Wayne-Western Charlton.

     High Rip Current Risk through late tonight for Coastal Camden-
     Coastal Glynn.

     High Surf Advisory until 8 PM EDT this evening for Coastal
     Camden-Coastal Glynn.

     Wind Advisory until midnight EDT tonight for Appling-Atkinson-
     Bacon-Coffee-Jeff Davis.

AM...Tropical Storm Warning for Coastal waters from Altamaha Sound to
     Fernandina Beach FL out 20 NM-Waters from Altamaha Sound GA
     to Fernandina Beach FL from 20 to 60 NM.

     Small Craft Advisory until 3 AM EDT Thursday for Coastal waters
     from Fernandina Beach to St. Augustine FL out 20 NM-Coastal
     waters from St. Augustine to Flagler Beach FL out 20 NM-
     Waters from Fernandina Beach to St. Augustine FL from 20 to
     60 NM-Waters from St. Augustine to Flagler Beach FL from 20
     to 60 NM.

&&

In the hours before

Special weather statement, Jul 7, 2:47 PM EDT, 44 minutes before
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Local storm report, Jul 7, 2:48 PM EDT, 43 minutes before
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Local storm report, Jul 7, 3:14 PM EDT, 17 minutes before
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Local storm report, Jul 7, 3:16 PM EDT, 15 minutes before
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Local storm report, Jul 7, 3:17 PM EDT, 14 minutes before
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Local storm report, Jul 7, 3:18 PM EDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
318 PM EDT WED JUL 7 2021

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

0311 PM     TROPICAL STORM   MARINELAND              29.66N 81.21W
07/07/2021                   Flagler            FL   EMERGENCY MNGR

            WINDS OF 40 MPH REPORTED IN MARINELAND, FL

&&

SCORDERO

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 6, 9:53 PM EDTRiver Flood WarningJAXAlachua, Columbia13 days
Jul 6, 9:54 PM EDTRiver Flood WarningJAXColumbia, Hamilton, Suwannee48 hr
Jul 6, 9:54 PM EDTRiver Flood WarningJAXHamilton, Suwannee71 hr
Jul 6, 11:03 PM EDTRip Current StatementJAXDuval, Flagler, Nassau28 hr
Jul 7, 4:02 AM EDTTornado WarningJAXAlachua, Marion28 min
Jul 7, 4:29 AM EDTTornado WarningJAXAlachua, Marion31 min
Jul 7, 4:33 AM EDTTornado WarningJAXMarion27 min
Jul 7, 5:05 AM EDTSpecial Weather StatementJAXAlachua, Marion40 min
Jul 7, 5:41 AM EDTSpecial Weather StatementJAXAlachua, Gilchrist49 min
Jul 7, 6:02 AM EDTTornado WarningJAXAlachua, Bradford, Union28 min
Jul 7, 6:33 AM EDTSpecial Weather StatementJAXAlachua, Suwannee, Union57 min
Jul 7, 6:40 AM EDTTornado WarningJAXAlachua, Columbia, Union35 min
Jul 7, 7:02 AM EDTTornado WarningJAXColumbia, Suwannee28 min
Jul 7, 7:23 AM EDTSpecial Weather StatementJAXBaker, Bradford, Clay, Columbia, Hamilton, Union67 min
Jul 7, 8:31 AM EDTSpecial Weather StatementJAXBaker, Hamilton44 min
Jul 7, 8:39 AM EDTTornado WarningJAXBaker, Columbia11 min
Jul 7, 9:59 AM EDTSpecial Weather StatementJAXNassau46 min
Jul 7, 12:00 PM EDTAreal Flood WarningJAXAlachua, Bradford, Columbia, Gilchrist, Hamilton, Suwannee and 1 more3 hr
Jul 7, 1:38 PM EDTAreal Flood WarningJAXAlachua, Baker, Bradford, Clay, Columbia, Duval and 4 more3 hr
Jul 7, 2:45 PM EDTSpecial Weather StatementJAXFlagler, Saint Johns60 min
Jul 7, 2:47 PM EDTSpecial Weather StatementJAXBaker, Clay, Duval, Nassau58 min
Jul 7, 2:49 PM EDTAreal Flood WarningJAXHamilton, Suwannee116 min
Jul 7, 2:54 PM EDTAreal Flood WarningJAXAlachua, Bradford111 min
Jul 7, 3:24 PM EDTRiver Flood WarningJAXColumbia, Gilchrist, Suwannee93 days
Jul 7, 3:45 PM EDTSpecial Weather StatementJAXClay, Duval, Nassau, Saint Johns60 min
Jul 7, 4:32 PM EDTTornado WarningJAXDuval, Saint Johns28 min
Jul 7, 4:45 PM EDTSpecial Weather StatementJAXDuval, Nassau60 min
Jul 7, 4:54 PM EDTTornado Warning Tornado observedJAXDuval, Nassau36 min
Jul 7, 5:15 PM EDTAreal Flood WarningJAXDuval, Nassau, Saint Johns2 hr
Jul 7, 6:42 PM EDTSpecial Marine WarningJAX93 min
Jul 7, 7:18 PM EDTAreal Flood WarningJAXNassau117 min
Jul 7, 2:52 AM EDTHigh Surf AdvisoryJAXCamden, Glynn13 hr
Jul 7, 9:01 AM EDTSpecial Weather StatementJAXAtkinson44 min
Jul 7, 9:17 AM EDTSpecial Weather StatementJAXEchols58 min
Jul 7, 9:37 AM EDTTornado WarningJAXBrantley, Pierce, Ware23 min
Jul 7, 10:03 AM EDTSpecial Weather StatementJAXCoffee42 min
Jul 7, 10:14 AM EDTSpecial Weather StatementJAXClinch46 min
Jul 7, 10:19 AM EDTSpecial Weather StatementJAXCamden41 min
Jul 7, 10:55 AM EDTSpecial Weather StatementJAXAtkinson, Bacon, Brantley, Coffee, Pierce65 min
Jul 7, 12:09 PM EDTSpecial Weather StatementJAXAppling, Jeff Davis36 min
Jul 7, 5:42 PM EDTTornado WarningJAXCamden33 min
Jul 7, 5:45 PM EDTSpecial Weather StatementJAXBrantley, Camden, Glynn, Wayne60 min
Jul 7, 6:11 PM EDTTornado Warning Tornado observedJAXCamden, Glynn, Wayne21 min
Jul 7, 6:17 PM EDTAreal Flood WarningJAXAppling, Brantley, Camden, Glynn, Pierce, Wayne3 hr
Jul 7, 6:46 PM EDTSpecial Weather StatementJAXCamden, Glynn, Wayne44 min
Jul 7, 7:01 PM EDTFlash Flood WarningJAXCamden, Glynn119 min
Jul 7, 7:53 PM EDTFlash Flood WarningJAXGlynn78 min

Nearby

Areal Flood Warnings in Florida, 2021Areal Flood Warnings in Georgia, 2021Every areal flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.