Alert archive / Florida / Flash Flood Warnings in 2013

Flash Flood Warning 49, NWS Tallahassee, FL

August 20, 2013Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at Aug 20, 2013, 12:11 PM CDT for Walton County, Florida. It was in force for 3 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: Aug 20, 2013, 12:11 PM CDT (17:11 UTC)
Expired: Aug 20, 2013, 3:15 PM CDT
In force: 3 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 15 km from the middle of the area, began a volume at 17:12 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 12:00Z, 5.2 hours before the alert went out and 170 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: 804 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 904 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

057 
WGUS52 KTAE 201711
FFWTAE
FLC131-202015-
/O.NEW.KTAE.FF.W.0049.130820T1711Z-130820T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1211 PM CDT TUE AUG 20 2013

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL AND SOUTHEAST WALTON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 315 PM CDT

* AT 1203 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETECTED FLASH
  FLOODING FROM NEARLY THUNDERSTORMS OVER THE WARNED AREA. HOURLY 
  RAINFALL RATES WERE AS HIGH AS 3 INCHES PER HOUR...AND THE STORMS
  MAY PERSIST FOR TWO TO THREE HOURS. THE HEAVY RAIN WAS ALSO
  FALLING OVER AREAS WITH NEARLY SATURATED GROUND CONDITIONS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCK
  HILL...NEW HOME...FREEPORT AND EUCHEEANNA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE AWAY FROM RISING WATER TO HIGHER GROUND! MOST FLOOD DEATHS OCCUR
IN VEHICLES. DO NOT ATTEMPT TO DRIVE THROUGH FLOODED ROADS.
REMEMBER...TURN AROUND...DON'T DROWN.

&&

LAT...LON 3067 8625 3069 8611 3059 8598 3051 8590
      3044 8594 3044 8597 3041 8599 3040 8600
      3044 8615 3056 8621

$$

08-LAMERS

1 follow-up statement

183 
WGUS72 KTAE 201852
FFSTAE

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
152 PM CDT TUE AUG 20 2013

FLC131-201901-
/O.CAN.KTAE.FF.W.0049.000000T0000Z-130820T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WALTON FL-
152 PM CDT TUE AUG 20 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL AND 
SOUTHEAST WALTON COUNTY...

ONLY SPOTTY LIGHT SHOWERS HAVE BEEN OCCURRING OVER THE WARNED AREA 
OVER THE PAST HOUR...THEREFORE THE THREAT OF FLASH FLOODING HAS 
DIMINISHED. THERE MAY BE LINGERING FLOODING ISSUES AS SOME WATER 
CONTINUES TO RUN OFF. REMEMBER...DO NOT DRIVE THROUGH FLOODED 
ROADWAYS. RADAR ESTIMATED LOCALIZED RAINFALL AMOUNTS OF UP TO 4.5 
INCHES IN SOUTHEAST WALTON COUNTY IN A LITTLE OVER AN HOUR.

LAT...LON 3067 8625 3069 8611 3059 8598 3051 8590
      3044 8594 3044 8597 3041 8599 3040 8600
      3044 8615 3056 8621

$$

08-LAMERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:40 PM CDT	Flash Flood Warning	TAE	Jackson	80 min
Aug 19, 9:53 PM CDT	Flash Flood Warning	TAE	Leon	82 min
Aug 20, 1:18 AM CDT	Rip Current Statement	TAE	Bay, Walton	18 hr
Aug 20, 2:54 AM CDT	Flash Flood Watch	TAE	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 3 more	28 hr
Aug 20, 9:05 AM CDT	River Flood Warning	TAE	Jefferson, Madison, Taylor	17 days
Aug 20, 11:32 AM CDT	Areal Flood Advisory	TAE	Walton	118 min
Aug 20, 1:28 PM CDT	Areal Flood Advisory	TAE	Holmes, Jackson, Walton, Washington	3 hr
Aug 20, 4:26 PM CDT	Special Weather Statement	TAE	Taylor	34 min
Aug 20, 4:56 PM CDT	Severe Thunderstorm Warning	TAE	Madison, Taylor	34 min
Aug 20, 5:16 PM CDT	Special Weather Statement	TAE	Madison	29 min
Aug 20, 5:42 PM CDT	Special Weather Statement	TAE	Madison	33 min

Nearby

Flash Flood Warnings in Florida, 2013 Every flash flood warning in 2013

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.