Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 55, NWS Tallahassee, FL

October 28, 20214 counties in Florida

NWS Tallahassee, FL issued this flash flood warning at Oct 28, 2021, 3:23 AM CDT for 4 counties in 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 28, 2021, 3:23 AM CDT (08:23 UTC)
Expired: Oct 28, 2021, 6:30 AM CDT
In force: 3 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

Counties Bay County, FL, Calhoun County, FL, Jackson County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 21 km from the middle of the area, began a volume at 08:25 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

Time	Report	Where	Remark
Oct 28, 4:30 AM CDT	FLASH FLOOD	Crystal Lake, FL	WATER REPORTED OVER THE ROAD AT HIGHWAY 77 AND CRYSTAL LAKE DRIVE.
Oct 28, 4:38 AM CDT	HEAVY RAIN 5.51	Compass Lake, FL	STORM TOTAL OF 5.51 INCHES AT THE LAKE HOUSE TEMPEST STATION.

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, 8.4 hours before the alert went out and 137 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2227 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

685 
WGUS52 KTAE 280823
FFWTAE
FLC005-013-063-133-281130-
/O.NEW.KTAE.FF.W.0055.211028T0823Z-211028T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
323 AM CDT Thu Oct 28 2021

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Northeastern Bay County in the panhandle of Florida...
  Northwestern Calhoun County in the panhandle of Florida...
  Jackson County in the panhandle of Florida...
  Washington County in the panhandle of Florida...

* Until 630 AM CDT.

* At 323 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...
  Vernon, Bradford, Alford, Wausau, Ebro, Porter Lake, Spring 
  Hollow, Gilberts Mill, Singer Road, Greenhead, Gainer Spring, 
  Orange Hill, Riverside, Smyrna, Sylvania, Sunny Hills, Fountain, 
  Betts, Bennett and Compass Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3045 8562 3045 8590 3047 8589 3047 8588
      3048 8587 3049 8586 3050 8586 3050 8587
      3051 8587 3071 8574 3073 8527 3043 8531
      3029 8569 3033 8571 3042 8560

FLASH FLOOD...RADAR INDICATED

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 27, 10:23 PM CDT	Special Marine Warning	TAE		2 hr
Oct 27, 11:21 PM CDT	Special Marine Warning	TAE		3 hr
Oct 28, 12:06 AM CDT	Special Marine Warning	TAE		114 min
Oct 28, 1:06 AM CDT	Tornado Warning	TAE	Bay	24 min
Oct 28, 1:40 AM CDT	Flash Flood Warning	TAE	Bay, Walton, Washington	3 hr
Oct 28, 1:52 AM CDT	Special Marine Warning	TAE		113 min
Oct 28, 2:08 AM CDT	Special Marine Warning	TAE		2 hr
Oct 28, 3:37 AM CDT	Special Marine Warning	TAE		3 hr
Oct 28, 4:06 AM CDT	Special Marine Warning	TAE		114 min
Oct 28, 5:53 AM CDT	Special Marine Warning	TAE		3 hr
Oct 28, 6:42 AM CDT	Special Weather Statement	TAE	Leon	33 min
Oct 28, 6:53 AM CDT	Tornado Warning	TAE	Dixie	26 min
Oct 28, 8:52 AM CDT	Special Marine Warning	TAE		53 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.