Alert archive / Florida / Areal Flood Warnings in 2021

Areal Flood Warning 42, NWS Jacksonville, FL

July 22, 2021Clay County, Duval County, Florida

NWS Jacksonville, FL issued this areal flood warning at Jul 22, 2021, 7:54 PM EDT for Clay County, Duval County, Florida. 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 22, 2021, 7:54 PM EDT (23:54 UTC)
Expired
Jul 22, 2021, 10:00 PM EDT
In force
2 hr
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Flood severity
None

Counties Clay County, FL, Duval County, FL

The radar

The Jacksonville radar (KJAX), 37 km from the middle of the area, began a volume at 23:56 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, 11.9 hours before the alert went out and 38 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 2021-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1564 joules per kilogram.LCLLFCEL10008507005003002001001 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 2021-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.1939Sfc1 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
1564 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
-16 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 22, 7:53 PM EDT, 1 minute earlier.

Area forecast discussion, Jul 22, 7:53 PM EDT, 1 minute before
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In the hours before

Special weather statement, Jul 22, 6:33 PM EDT, 1 hour 21 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
633 PM EDT Thu Jul 22 2021

FLZ023-024-031-122-425-GAZ364-222315-
Baker FL-Western Duval FL-Inland Nassau FL-Bradford FL-
Northern Columbia FL-Western Charlton GA-
633 PM EDT Thu Jul 22 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NASSAU...NORTHERN
BRADFORD...BAKER...EAST CENTRAL COLUMBIA...WEST CENTRAL DUVAL AND
SOUTH CENTRAL CHARLTON COUNTIES UNTIL 715 PM EDT...

* At 633 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm 7 miles west of Taylor, or 20 miles
  northeast of Lake City, moving southeast at 25 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Taylor, Macclenny, Glen St. Mary and Sanderson.

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

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 3052 8243 3038 8196 3012 8211 3036 8252
TIME...MOT...LOC 2233Z 298DEG 21KT 3041 8240

23
Special weather statement, Jul 22, 7:07 PM EDT, 47 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
707 PM EDT Thu Jul 22 2021

FLZ033-125-132-232-325-425-222345-
Eastern Clay FL-Western Clay FL-Western Duval FL-
South Central Duval FL-Coastal Duval FL-Inland St. Johns FL-
707 PM EDT Thu Jul 22 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ST. JOHNS...NORTHERN
CLAY AND SOUTH CENTRAL DUVAL COUNTIES UNTIL 745 PM EDT...

* At 707 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near Bellair-Meadowbrook Terrace, or
  near Orange Park, moving southeast at 10 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Orange Park, Green Cove Springs, Middleburg, Mandarin, Fruit Cove,
  Fleming Island, Oakleaf Plantation, Bellair-Meadowbrook Terrace,
  Switzerland and Cecil Field.

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

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 2990 8166 3010 8198 3027 8185 3012 8149
TIME...MOT...LOC 2307Z 302DEG 10KT 3017 8180

23
Local storm report, Jul 22, 7:30 PM EDT, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
730 PM EDT THU JUL 22 2021

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

0720 PM     TSTM WND DMG     2 S MACCLENNY           30.25N 82.12W
07/22/2021                   BAKER              FL   PUBLIC

            REPORT FROM MPING: TREES UPROOTED OR SNAPPED
            NEAR STATE ROAD 121 AND JEFF STARLING ROAD.

&&

KC
Local storm report, Jul 22, 7:34 PM EDT, 20 minutes before
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Local storm report, Jul 22, 7:40 PM EDT, 14 minutes before
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Jul 22, 7:45 PM EDT, 9 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
745 PM EDT Thu Jul 22 2021

FLZ125-133-225-325-425-230030-
Coastal St. Johns FL-Western Duval FL-South Central Duval FL-
Trout River FL-Coastal Duval FL-
745 PM EDT Thu Jul 22 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL ST. JOHNS AND
SOUTHEASTERN DUVAL COUNTIES UNTIL 830 PM EDT...

* At 745 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over San Marco, or near
  Jacksonville, moving east at 30 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Jacksonville, Unf, Arlington, Ponte Vedra Beach, Sawgrass,
  Baymeadows, Ortega, Craig Field, San Pablo and Palm Valley.

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

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 3023 8175 3039 8168 3030 8139 3005 8131
TIME...MOT...LOC 2345Z 292DEG 25KT 3028 8165

23

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 4:28 PM EDTSpecial Weather StatementJAXFlagler32 min
Jul 22, 4:38 PM EDTSpecial Marine WarningJAX67 min
Jul 22, 4:52 PM EDTSpecial Weather StatementJAXLake23 min
Jul 22, 5:19 PM EDTSpecial Weather StatementJAXColumbia, Suwannee41 min
Jul 22, 5:36 PM EDTSevere Thunderstorm WarningJAXSuwannee24 min
Jul 22, 6:02 PM EDTSpecial Weather StatementJAXSuwannee43 min
Jul 22, 6:04 PM EDTSpecial Weather StatementJAXFlagler41 min
Jul 22, 6:07 PM EDTSpecial Marine WarningJAX53 min
Jul 22, 6:32 PM EDTSpecial Marine WarningJAX58 min
Jul 22, 6:33 PM EDTSpecial Weather StatementJAXBaker42 min
Jul 22, 6:47 PM EDTSevere Thunderstorm WarningJAXFlagler, Putnam, Saint Johns28 min
Jul 22, 6:56 PM EDTSpecial Marine WarningJAX94 min
Jul 22, 6:59 PM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Nassau, Union31 min
Jul 22, 7:07 PM EDTSpecial Weather StatementJAXClay38 min
Jul 22, 7:13 PM EDTSpecial Marine WarningJAX62 min
Jul 22, 7:29 PM EDTSevere Thunderstorm WarningJAXClay, Duval, Saint Johns46 min
Jul 22, 7:45 PM EDTSpecial Weather StatementJAXDuval45 min
Jul 22, 7:52 PM EDTSpecial Marine WarningJAX83 min
Jul 22, 7:16 AM EDTSpecial Weather StatementJAXCoffee59 min
Jul 22, 4:14 PM EDTSpecial Weather StatementJAXBrantley46 min
Jul 22, 4:56 PM EDTSpecial Weather StatementJAXEchols49 min

Nearby

Areal Flood Warnings in Florida, 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.