Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 4, NWS Tallahassee, FL

April 9, 2021Bay County, Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at Apr 9, 2021, 9:22 AM CDT for Bay County, Walton County, Florida. It was in force for 3 hr. 1 report 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, 9:22 AM CDT (14:22 UTC)
Expired
Apr 9, 2021, 12:30 PM CDT
In force
3 hr
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon
Flood severity
None

Counties Bay County, FL, Walton County, FL

The radar

The Eglin Afb radar (KEVX), 34 km from the middle of the area, began a volume at 14:25 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, 10:30 AM CDTFLASH FLOOD2 S Santa Rosa Beach, FLREPORT OF FLOODING ON HIGHWAY 393.

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, 2.4 hours before the alert went out and 181 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°0°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.

805 
WGUS52 KTAE 091422
FFWTAE
FLC005-131-091730-
/O.NEW.KTAE.FF.W.0004.210409T1422Z-210409T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  West Central Bay County in the panhandle of Florida...
  Walton County in the panhandle of Florida...

* Until 1230 PM CDT.

* At 922 AM CDT, 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 Beach, Santa Rosa Beach, Inlet Beach, Seagrove Beach, 
  Seaside, Port Washington, Grayton Beach, Hollywood Beach, Laguna 
  Beach, Sunnyside, Blue Mountain Beach, Gulf Resort Beach, 
  Bid-a-Wee, Bahama Beach, Edgewater Gulf Beach, Four Mile Village, 
  Sandestin, West Panama City, Gulf Pines and Miramar Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3040 8639 3038 8633 3042 8631 3039 8630
      3040 8622 3042 8627 3042 8626 3043 8625
      3038 8617 3036 8608 3031 8599 3039 8612
      3040 8612 3024 8578 3016 8580 3032 8615
      3035 8639

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, 9:53 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, 11:11 AM CDTFlash Flood WarningTAEBay, Gulf2 hr
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.