Alert archive / Florida / Flash Flood Warnings in 2012

Flash Flood Warning 10, NWS Tallahassee, FL

May 29, 2012Dixie County, Lafayette County, Taylor County, Florida

NWS Tallahassee, FL issued this flash flood warning at May 29, 2012, 4:41 AM EDT for Dixie County, Lafayette County, Taylor County, Florida. It was in force for 3 hr. 4 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: May 29, 2012, 4:41 AM EDT (08:41 UTC)
Expired: May 29, 2012, 7:45 AM EDT
In force: 3 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

Counties Dixie County, FL, Lafayette County, FL, Taylor County, FL

What was reported inside it

Time	Report	Where	Remark
May 29, 5:00 AM EDT	HEAVY RAIN 8.09	W Cooks Hammock, FL	MEASURED ON A SRWMD RAIN GAUGE. STORM TOTAL THROUGH 5 AM EDT.
May 29, 5:00 AM EDT	HEAVY RAIN 8.7	1 Se Midway, FL	MEASURED AT A SRWMD RAIN GAUGE. STORM TOTAL THROUGH 5 AM EDT.
May 29, 6:00 AM EDT	HEAVY RAIN 11.5	1 Se Midway, FL	MEASURED AT A SRWMD RAIN GAUGE. STORM TOTAL THROUGH 6 AM EDT.
May 29, 6:30 AM EDT	HEAVY RAIN 12.65	1 Se Midway, FL	MEASURED AT A SRWMD RAIN GAUGE. STORM TOTAL THROUGH 630 AM EDT.

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, 8.7 hours before the alert went out and 129 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: 851 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 864 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 68 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.

521 
WGUS52 KTAE 290841
FFWTAE
FLC029-067-123-291145-
/O.NEW.KTAE.FF.W.0010.120529T0841Z-120529T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
441 AM EDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN DIXIE COUNTY IN FLORIDA...
  SOUTHERN LAFAYETTE COUNTY IN FLORIDA...
  SOUTHEASTERN TAYLOR COUNTY IN FLORIDA...

* UNTIL 745 AM EDT

* AT 440 AM EDT...THE NATIONAL WEATHER SERVICE HAS DETECTED VERY     
  HEAVY RAINFALL RATES OF 2 TO 3 INCHES PER HOUR...IN A BAND OF      
  HEAVY RAIN THAT EXTENDED FROM SOUTHERN LAFAYETTE COUNTY...INTO     
  FAR SOUTHERN TAYLOR COUNTY...AND WELL OUT OVER THE GULF OF         
  MEXICO WATERS. THE RAIN BAND WILL CONTINUE TO AFFECT THE SAME      
  AREA. PORTIONS OF SOUTHERN LAFAYETTE COUNTY HAVE RECEIVED AS       
  MUCH AS 14 INCHES OF RAIN SINCE EARLY MONDAY MORNING. 

  THIS IS BECOMING A VERY DANGEROUS SITUATION FOR ANYONE LIVING IN
  LOW LYING AREAS...OR NEAR STREAMS OR CREEKS...AND ESPECIALLY IN
  SOUTHERN LAFAYETTE COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN        
  PEDRO JUNCTION...ALTON...GRADY...MIDWAY...TENNILLE AND COOKS       
  HAMMOCK. THIS ALSO INCLUDES PART OF THE STEINHATCHEE RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DON'T DROWN.

&&

LAT...LON 2984 8289 2972 8329 2966 8335 2973 8344
      2982 8347 2999 8333 3008 8307 2999 8296
      2996 8294 2995 8292 2991 8291 2989 8287

$$

08-LAMERS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 1:01 AM EDT	Flash Flood Warning	TAE	Lafayette	119 min
May 29, 2:58 AM EDT	Flash Flood Warning	TAE	Dixie, Lafayette, Taylor	107 min
May 29, 5:32 AM EDT	Special Marine Warning	TAE		58 min
May 29, 6:26 AM EDT	Areal Flood Advisory	TAE	Dixie	2 hr
May 29, 6:51 AM EDT	Special Marine Warning	TAE		54 min
May 29, 8:25 AM EDT	Areal Flood Advisory	TAE	Dixie	3 hr
May 29, 6:04 PM EDT	Areal Flood Advisory	TAE	Lafayette	3 hr

Nearby

Flash Flood Warnings in Florida, 2012 Every flash flood warning in 2012

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.