Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 41, NWS Tallahassee, FL

October 4, 2021Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at Oct 4, 2021, 6:04 AM CDT for Walton County, Florida. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 4, 2021, 6:04 AM CDT (11:04 UTC)
Expired: Oct 4, 2021, 6:00 PM CDT
In force: 12 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 40 km from the middle of the area, began a volume at 11:04 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 11.1 hours before the alert went out and 191 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 218 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 930 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -57 m²/s²
0-3 km storm-relative helicity: -61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

390 
WGUS52 KTAE 041104
FFWTAE
FLC131-041400-
/O.NEW.KTAE.FF.W.0041.211004T1104Z-211004T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
604 AM CDT Mon Oct 4 2021

The National Weather Service in Tallahassee has issued a

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

* Until 900 AM CDT.

* At 604 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...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...
  Santa Rosa Beach, Four Mile Village, Sandestin, Gulf Pines and 
  Miramar Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3040 8639 3038 8633 3042 8631 3039 8630
      3040 8630 3040 8629 3039 8629 3040 8628
      3039 8624 3040 8623 3041 8626 3041 8627
      3042 8627 3043 8625 3042 8623 3042 8622
      3034 8623 3037 8639

FLASH FLOOD...RADAR INDICATED

$$

MM

2 follow-up statements

482 
WGUS52 KTAE 041345
FFWTAE
FLC131-041700-
/O.EXT.KTAE.FF.W.0041.000000T0000Z-211004T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
845 AM CDT Mon Oct 4 2021

The National Weather Service in Tallahassee has extended the

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

* Until noon CDT.

* At 845 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...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...
  Santa Rosa Beach, Four Mile Village, Sandestin, Gulf Pines and 
  Miramar Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3040 8639 3038 8633 3042 8631 3039 8630
      3040 8630 3040 8629 3039 8629 3040 8628
      3039 8624 3040 8623 3041 8626 3041 8627
      3042 8627 3043 8625 3042 8623 3042 8622
      3034 8623 3037 8639

FLASH FLOOD...RADAR INDICATED

$$

MM

069 
WGUS52 KTAE 041650
FFWTAE
FLC131-042300-
/O.EXT.KTAE.FF.W.0041.000000T0000Z-211004T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
1150 AM CDT Mon Oct 4 2021

The National Weather Service in Tallahassee has extended the

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

* Until 600 PM CDT Monday.

* At 1150 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...Emergency Management.

  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...
  Santa Rosa Beach, Four Mile Village, Sandestin, Gulf Pines and 
  Miramar Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3040 8639 3038 8633 3042 8631 3039 8630
      3040 8630 3040 8629 3039 8629 3040 8628
      3039 8624 3040 8623 3041 8626 3041 8627
      3042 8627 3043 8625 3042 8623 3042 8622
      3034 8623 3037 8639

FLASH FLOOD...RADAR INDICATED

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 4, 2:47 AM CDT	Flash Flood Watch	TAE	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 5 more	4 days
Oct 4, 4:45 AM CDT	Areal Flood Advisory	TAE	Walton	3 hr
Oct 4, 5:38 AM CDT	Flash Flood Warning	TAE	Walton	3 hr
Oct 4, 7:52 AM CDT	Areal Flood Advisory	TAE	Walton	5 hr

Nearby

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