Alert archive / Florida / Flash Flood Warnings in 2020

Flash Flood Warning 13, NWS Tallahassee, FL

August 24, 2020Bay County, Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at Aug 24, 2020, 1:49 PM CDT for Bay County, Walton County, Florida. It was in force for 5 hr. 3 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: Aug 24, 2020, 1:49 PM CDT (18:49 UTC)
Expired: Aug 24, 2020, 6:45 PM CDT
In force: 5 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), 30 km from the middle of the area, began a volume at 18:48 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
Aug 24, 4:19 PM CDT	FLASH FLOOD	Panama City Beach, FL	WATER REPORTED OVER ROADS AT SEVERAL LOCATIONS. WATER UP TO CAR DOORS ON THOMAS DRIVE.
Aug 24, 4:55 PM CDT	FLASH FLOOD	1 N Edgewater Gulf Beac, FL	MEDIA RELAYED REPORT OF FLOODING ONGOING ON ALF COLEMAN ROAD BETWEEN BACK BEACH AND MIDDLE BEACH ROADS.
Aug 24, 4:56 PM CDT	FLASH FLOOD	1 Ne Edgewater Gulf Bea, FL	MULTIPLE VEHICLES DISABLED ON RICHARD JACKSON BLVD BETWEEN BACK BEACH AND MIDDLE BEACH ROAD. MEDIA RELAYED REPORT.

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, 6.8 hours before the alert went out and 166 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: 552 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

617 
WGUS52 KTAE 241849
FFWTAE
FLC005-131-242345-
/O.NEW.KTAE.FF.W.0013.200824T1849Z-200824T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
149 PM CDT Mon Aug 24 2020

The National Weather Service in Tallahassee has issued a

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

* Until 645 PM CDT.

* At 149 PM 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, Panama City Beach, Callaway, Santa Rosa Beach, 
  Springfield, Tyndall Air Force Base, Parker, Gulf Resort Beach, 
  Bid-a-Wee, Sunnyside, Bahama Beach, Laguna Beach, Hollywood Beach, 
  Edgewater Gulf Beach, West Panama City, Gulf Lagoon Beach, Inlet 
  Beach, Biltmore Beach, Magnolia Beach and St Andrews State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3034 8623 3040 8620 3039 8617 3038 8617
      3038 8613 3035 8606 3035 8609 3034 8603
      3031 8600 3031 8599 3034 8602 3028 8585
      3011 8557 3005 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
Aug 23, 7:42 PM CDT	Special Marine Warning	TAE		33 min
Aug 23, 7:45 PM CDT	Special Weather Statement	TAE	Taylor	45 min
Aug 23, 7:50 PM CDT	Flash Flood Watch	TAE	Bay, Franklin, Gulf, Wakulla, Walton	25 hr
Aug 23, 8:13 PM CDT	Special Marine Warning	TAE		92 min
Aug 23, 9:25 PM CDT	Special Weather Statement	TAE	Franklin, Wakulla	50 min
Aug 23, 9:44 PM CDT	Special Marine Warning	TAE		2 hr
Aug 23, 10:06 PM CDT	Special Weather Statement	TAE	Calhoun, Liberty	54 min
Aug 23, 11:43 PM CDT	Special Marine Warning	TAE		2 hr
Aug 24, 1:41 AM CDT	Special Marine Warning	TAE		94 min
Aug 24, 1:45 AM CDT	Special Weather Statement	TAE	Franklin	45 min
Aug 24, 3:10 AM CDT	Special Marine Warning	TAE		2 hr
Aug 24, 3:33 AM CDT	Areal Flood Advisory	TAE	Franklin	117 min
Aug 24, 4:00 AM CDT	Special Weather Statement	TAE	Gulf	45 min
Aug 24, 5:00 AM CDT	Special Marine Warning	TAE		90 min
Aug 24, 6:30 AM CDT	Special Marine Warning	TAE		2 hr
Aug 24, 8:24 AM CDT	Special Marine Warning	TAE		3 hr
Aug 24, 10:10 AM CDT	Special Marine Warning	TAE		95 min
Aug 24, 11:25 AM CDT	Special Marine Warning	TAE		3 hr
Aug 24, 2:23 PM CDT	Special Marine Warning	TAE		97 min
Aug 24, 2:52 PM CDT	Special Marine Warning	TAE		3 hr
Aug 24, 3:23 PM CDT	Tornado Warning	TAE	Bay	37 min
Aug 24, 3:35 PM CDT	Special Weather Statement	TAE	Jackson	25 min
Aug 24, 3:59 PM CDT	Special Weather Statement	TAE	Dixie	46 min
Aug 24, 4:01 PM CDT	Special Weather Statement	TAE	Lafayette	29 min
Aug 24, 4:31 PM CDT	Flash Flood Warning	TAE	Bay, Holmes, Jackson, Washington	3 hr
Aug 24, 4:42 PM CDT	Special Weather Statement	TAE	Lafayette	48 min
Aug 24, 5:09 PM CDT	Special Weather Statement	TAE	Lafayette, Madison	51 min
Aug 24, 5:37 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Lafayette, Madison, Taylor	23 min
Aug 24, 5:58 PM CDT	Severe Thunderstorm Warning	TAE	Madison	32 min
Aug 24, 6:40 PM CDT	Special Weather Statement	TAE	Jackson	35 min

Nearby

Flash Flood Warnings in Florida, 2020 Every flash flood warning in 2020

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.