Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 49, NWS Tallahassee, FL

October 7, 2021Bay County, Florida

NWS Tallahassee, FL issued this flash flood warning at Oct 7, 2021, 6:44 AM CDT for Bay County, Florida. It was in force for 3 hr. 2 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
Oct 7, 2021, 6:44 AM CDT (11:44 UTC)
Expired
Oct 7, 2021, 9:45 AM CDT
In force
3 hr
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon
Flood severity
None

County Bay County, FL

The radar

The Eglin Afb radar (KEVX), 64 km from the middle of the area, began a volume at 11:43 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
Oct 7, 8:00 AM CDTFLASH FLOOD3 E Callaway, FLOLD BICYCLE ROAD BRIDGE IS UNDERWATER.
Oct 7, 8:00 AM CDTFLASH FLOOD3 Se Tyndall Afb, FLTYNDALL PKWY WAS CLOSED DUE TO FLOODING.

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 00:00Z, 11.7 hours before the alert went out and 122 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 00:00Z on 2021-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 111 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 00:00Z on 2021-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 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
111 J/kg
Mixed-layer CIN
-154 J/kg
Mixed-layer LCL
837 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

805 
WGUS52 KTAE 071144
FFWTAE
FLC005-071445-
/O.NEW.KTAE.FF.W.0049.211007T1144Z-211007T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
644 AM CDT Thu Oct 7 2021

The National Weather Service in Tallahassee has issued a

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

* Until 945 AM CDT.

* At 644 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen in the last 1 Hour. Additional rainfall amounts of 2 
  to 4 inches are possible in the warned area. Flash flooding is 
  ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Callaway and Tyndall Air Force Base.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3006 8561 3019 8552 3031 8549 3020 8539
      3003 8547 3002 8549 3003 8554 3003 8555

FLASH FLOOD...RADAR INDICATED

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 6, 8:49 PM CDTRiver Flood WarningTAECalhoun, Franklin, Gulf, Liberty6 days
Oct 7, 2:34 AM CDTDense Fog AdvisoryTAEMadison5 hr
Oct 7, 3:15 AM CDTSpecial Weather StatementTAEWashington45 min
Oct 7, 3:23 AM CDTTornado WarningTAEBay20 min
Oct 7, 3:27 AM CDTFlash Flood WarningTAEBay3 hr
Oct 7, 3:49 AM CDTSpecial Marine WarningTAE26 min
Oct 7, 3:54 AM CDTSpecial Weather StatementTAEBay66 min
Oct 7, 5:05 AM CDTSpecial Weather StatementTAEBay55 min
Oct 7, 5:12 AM CDTFlash Flood WarningTAEBay, Washington3 hr
Oct 7, 5:34 AM CDTFlash Flood Warning Considerable damage threatTAEBay3 hr
Oct 7, 5:56 AM CDTTornado WarningTAEBay34 min
Oct 7, 6:27 AM CDTFlash Flood Warning Considerable damage threatTAEBay2 hr
Oct 7, 6:45 AM CDTTornado WarningTAEBay15 min
Oct 7, 7:52 AM CDTFlash Flood WarningTAEBay, Calhoun, Gulf2 hr
Oct 7, 8:18 AM CDTSpecial Marine WarningTAE42 min
Oct 7, 8:32 AM CDTAreal Flood WarningTAEBay, Washington10 hr
Oct 7, 9:04 AM CDTFlash Flood WarningTAEGulf2 hr
Oct 7, 10:29 AM CDTAreal Flood WarningTAEBay, Calhoun, Gulf9 hr
Oct 7, 11:17 AM CDTRip Current StatementTAEBay, Franklin, Gulf, Walton14 hr
Oct 7, 2:40 PM CDTSpecial Marine WarningTAE35 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.