Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 19, NWS Tallahassee, FL

July 18, 2021Leon County, Florida

NWS Tallahassee, FL issued this flash flood warning at Jul 18, 2021, 5:06 PM EDT for Leon County, Florida. It was in force for 84 min. 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: Jul 18, 2021, 5:06 PM EDT (21:06 UTC)
Expired: Jul 18, 2021, 6:30 PM EDT
In force: 84 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

County Leon County, FL

The radar

The Tallahassee radar (KTLH), 12 km from the middle of the area, began a volume at 21:06 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
Jul 18, 5:55 PM EDT	FLASH FLOOD	2 Ese Indian Head Acres, FL	PONDING OF WATER ON SOUTHBOUND LANES OF CAPITAL CIRCLE SOUTHEAST AT MIDYETTE ROAD. KNOWN AREA PRONE TO FLOODING. RADAR ESTIMATED 2.65 INCHES OF RAIN IN 1 HOUR AT THIS LOCATION.
Jul 18, 6:00 PM EDT	HEAVY RAIN 3.09	1 Ese Tom Brown Park, FL	3.09 INCHES OF RAIN MEASURED IN 1.5 HOURS FROM 4:30 PM TO 6:00 PM FROM A RETIRED NWS EMPLOYEE IN THE PINEY Z COMMUNITY.

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, 9.1 hours before the alert went out and 9 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: 912 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

372 
WGUS52 KTAE 182106
FFWTAE
FLC073-182230-
/O.NEW.KTAE.FF.W.0019.210718T2106Z-210718T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
506 PM EDT Sun Jul 18 2021

The National Weather Service in Tallahassee has issued a

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

* Until 630 PM EDT.

* At 506 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen in the last 1 Hour. 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...
  Tallahassee, Florida A And M, Ralford Greenway, Apalachee Regional 
  Park, Tom Brown Park, Fallschase, Southwood, Chaires, Chaires 
  Crossroads, Governors Square Mall, Indian Head Acres, Tallahassee 
  Memorial Hosp, North Florida Fairgrounds, Belair, Killearn 
  Estates, State Capital Complex, Kleman Plaza, Leon County Civic 
  Center, Bragg Stadium and Lutterloh.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3042 8430 3052 8422 3054 8411 3034 8408
      3033 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
Jul 18, 9:57 AM EDT	Special Marine Warning	TAE		65 min
Jul 18, 10:53 AM EDT	Special Weather Statement	TAE	Dixie	52 min
Jul 18, 12:07 PM EDT	Special Weather Statement	TAE	Lafayette	53 min
Jul 18, 12:24 PM EDT	Special Weather Statement	TAE	Taylor	51 min
Jul 18, 12:48 PM EDT	Special Weather Statement	TAE	Lafayette	27 min
Jul 18, 1:38 PM EDT	Special Weather Statement	TAE	Madison	52 min
Jul 18, 2:46 PM EDT	Special Weather Statement	TAE	Jackson	44 min
Jul 18, 3:29 PM EDT	Special Weather Statement	TAE	Calhoun, Liberty	46 min
Jul 18, 4:12 PM EDT	Special Weather Statement	TAE	Gadsden, Liberty	48 min
Jul 18, 4:19 PM EDT	Special Weather Statement	TAE	Leon	41 min
Jul 18, 4:41 PM EDT	Special Weather Statement	TAE	Gadsden, Leon, Wakulla	64 min
Jul 18, 4:48 PM EDT	Areal Flood Advisory	TAE	Leon	57 min
Jul 18, 5:38 PM EDT	Special Weather Statement	TAE	Jefferson	52 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.