Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 33, NWS Tallahassee, FL

September 9, 2021Gadsden County, Leon County, Florida

NWS Tallahassee, FL issued this flash flood warning at Sep 9, 2021, 12:32 AM EDT for Gadsden County, Leon County, Florida. It was in force for 118 min. 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: Sep 9, 2021, 12:32 AM EDT (04:32 UTC)
Expired: Sep 9, 2021, 2:30 AM EDT
In force: 118 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

Counties Gadsden County, FL, Leon County, FL

The radar

The Tallahassee radar (KTLH), 11 km from the middle of the area, began a volume at 04:36 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
Sep 9, 1:22 AM EDT	FLASH FLOOD	1 Sse Tallahassee Comm, FL	1 FOOT OF WATER WAS REPORTED OVER THE ROAD NEAR THE INTERSECTION OF JACKSON BLUFF ROAD AND CHIPLEY STREET.

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, 4.5 hours before the alert went out and 14 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: 35 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 965 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

702 
WGUS52 KTAE 090432
FFWTAE
FLC039-073-090630-
/O.NEW.KTAE.FF.W.0033.210909T0432Z-210909T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
1232 AM EDT Thu Sep 9 2021

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Southeastern Gadsden County in Big Bend Florida...
  Leon County in Big Bend Florida...

* Until 230 AM EDT.

* At 1232 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Tallahassee, Midway, Havana, Tallahassee Comm College, Doak 
  Campbell Stadium, Florida State University, Florida A And M, 
  Mission San Luis, Lake Jackson, Innovation Park, Tallahassee Coml 
  Airport, Tallahassee Mall, Levy Park, Lake Bradford, Tallahassee 
  Regional A/P, Andrew, Macon Community Park, Lake Ella, Leon County 
  Civic Center and Bragg Stadium.

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 3030 8464 3044 8462 3069 8431 3068 8409
      3030 8427

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
Sep 8, 9:08 PM EDT	Tornado Warning	TAE	Wakulla	13 min
Sep 8, 11:57 PM EDT	Areal Flood Advisory	TAE	Gadsden, Leon	2 hr
Sep 9, 5:01 AM EDT	Small Craft Advisory	TAE		5 hr
Sep 9, 5:11 PM EDT	Special Weather Statement	TAE	Wakulla	34 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.