Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Tallahassee, FL

April 9, 2021Bay County, Gulf County, Florida

NWS Tallahassee, FL issued this flash flood warning at Apr 9, 2021, 11:11 AM CDT for Bay County, Gulf County, Florida. It was in force for 2 hr. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 9, 2021, 11:11 AM CDT (16:11 UTC)
Expired
Apr 9, 2021, 1:15 PM CDT
In force
2 hr
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon
Flood severity
None

Counties Bay County, FL, Gulf County, FL

The radar

The Eglin Afb radar (KEVX), 58 km from the middle of the area, began a volume at 16:11 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.

What was reported inside it

TimeReportWhereRemark
Apr 9, 11:45 AM CDTFLASH FLOOD1 Nne Gulf Lagoon Beach, FLROAD CLOSURE DUE TO WATER NEAR FRONT BEACH RD AND DOROTHY AVE.
Apr 9, 11:48 AM CDTFLASH FLOOD1 N Gulf Lagoon Beach, FLROAD CLOSURE AT ALLISON AVE AND FRONT BEACH RD.
Apr 9, 12:00 PM CDTFLASH FLOODPanama City, FLREPORT OF OAK AVE BEING CLOSED.
Apr 9, 12:01 PM CDTFLASH FLOODPanama City, FLREPORT OF 14TH ST BEING CLOSED WEST OF JENKS AVE.
Apr 9, 12:49 PM CDTHEAVY RAIN 7.32Mexico Beach, FL7.32 INCHES OF RAIN SO FAR TODAY AT THE MEXICO BEACH WEATHERSTEM SITE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.2 hours before the alert went out and 125 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, Tallahassee Rgnl, FL at 12:00Z on 2021-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1133 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2021-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.19395878Sfc1 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
1133 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
692 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.5

Open this sounding in Storm Lab

The text

As transmitted.

812 
WGUS52 KTAE 091611
FFWTAE
FLC005-045-091815-
/O.NEW.KTAE.FF.W.0005.210409T1611Z-210409T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
1111 AM CDT Fri Apr 9 2021

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Southeastern Bay County in the panhandle of Florida...
  Northwestern Gulf County in the panhandle of Florida...

* Until 115 PM CDT /215 PM EDT/.

* At 1111 AM CDT /1211 PM EDT/, Doppler radar indicated 
  thunderstorms producing heavy rain across the warned area. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Panama City, Lynn Haven, Panama City Beach, Callaway, Springfield, 
  Mexico Beach, Tyndall Air Force Base, Hiland Park, Parker, Bay 
  Harbor, Millville, Cedar Grove, Beacon Beach, Dirego Park, 
  Brannonville, Allanton, College Station, Wetappo, Davis Beach and 
  Magnolia Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3022 8582 3033 8574 3028 8562 3028 8560
      3020 8539 3019 8535 2992 8532 2986 8537
      2987 8539 3018 8584

FLASH FLOOD...RADAR INDICATED

$$

42-DVD

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 1:48 AM CDTSpecial Marine WarningTAE57 min
Apr 9, 3:16 AM CDTSpecial Weather StatementTAEGulf44 min
Apr 9, 3:31 AM CDTSpecial Marine WarningTAE44 min
Apr 9, 3:44 AM CDTSevere Thunderstorm WarningTAEFranklin, Gulf, Liberty31 min
Apr 9, 4:15 AM CDTSevere Thunderstorm WarningTAEFranklin, Gulf45 min
Apr 9, 4:55 AM CDTSevere Thunderstorm WarningTAEFranklin35 min
Apr 9, 5:22 AM CDTSpecial Marine WarningTAE53 min
Apr 9, 5:31 AM CDTSpecial Weather StatementTAEFranklin44 min
Apr 9, 5:49 AM CDTSevere Thunderstorm WarningTAEBay, Calhoun, Jackson, Washington56 min
Apr 9, 6:07 AM CDTSpecial Marine WarningTAE113 min
Apr 9, 6:37 AM CDTSpecial Weather StatementTAELiberty38 min
Apr 9, 6:43 AM CDTSevere Thunderstorm WarningTAEBay, Calhoun, Jackson62 min
Apr 9, 6:48 AM CDTAreal Flood AdvisoryTAEBay, Gulf3 hr
Apr 9, 6:59 AM CDTSpecial Weather StatementTAEWalton46 min
Apr 9, 7:16 AM CDTSpecial Weather StatementTAEHolmes44 min
Apr 9, 7:18 AM CDTSpecial Weather StatementTAEGulf27 min
Apr 9, 7:34 AM CDTSevere Thunderstorm WarningTAEHolmes, Jackson, Washington43 min
Apr 9, 7:35 AM CDTSevere Thunderstorm WarningTAEJackson55 min
Apr 9, 7:54 AM CDTSpecial Marine WarningTAE2 hr
Apr 9, 8:31 AM CDTSpecial Marine WarningTAE3 hr
Apr 9, 9:22 AM CDTFlash Flood WarningTAEBay, Walton3 hr
Apr 9, 9:53 AM CDTSpecial Marine WarningTAE3 hr
Apr 9, 10:27 AM CDTSevere Thunderstorm WarningTAEBay48 min
Apr 9, 11:04 AM CDTSevere Thunderstorm WarningTAEBay, Gulf41 min
Apr 9, 11:27 AM CDTSpecial Marine WarningTAE3 hr
Apr 9, 11:43 AM CDTSpecial Weather StatementTAEGulf47 min
Apr 9, 11:56 AM CDTSpecial Weather StatementTAEBay, Calhoun, Jackson, Liberty, Washington64 min
Apr 9, 12:39 PM CDTSpecial Weather StatementTAELiberty51 min
Apr 9, 2:07 PM CDTSmall Craft AdvisoryTAE29 hr
Apr 9, 2:28 PM CDTSpecial Marine WarningTAE2 hr
Apr 9, 4:42 PM CDTSpecial Weather StatementTAEBay, Calhoun, Gadsden, Gulf, Jefferson, Leon and 2 more48 min
Apr 9, 5:25 PM CDTSpecial Marine WarningTAE95 min

Nearby

Flash Flood Warnings in Florida, 2021Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.