Alert archive / Florida / Flash Flood Warnings in 2012

Flash Flood Warning 8, NWS Tallahassee, FL

May 29, 2012Lafayette County, Florida

NWS Tallahassee, FL issued this flash flood warning at May 29, 2012, 1:01 AM EDT for Lafayette County, Florida. It was in force for 119 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 29, 2012, 1:01 AM EDT (05:01 UTC)
Expired: May 29, 2012, 3:00 AM EDT
In force: 119 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

County Lafayette County, FL

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 5.0 hours before the alert went out and 128 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.

615 
WGUS52 KTAE 290501
FFWTAE
FLC067-290700-
/O.NEW.KTAE.FF.W.0008.120529T0501Z-120529T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN LAFAYETTE COUNTY IN FLORIDA...

* UNTIL 300 AM EDT

* AT 1249 AM EDT...THE NATIONAL WEATHER SERVICE HAS DETECTED VERY 
  HEAVY RAINFALL RATES FROM DEVELOPING THUNDERSTORMS ACROSS SOUTHERN 
  LAFAYETTE COUNTY. THESE STORMS WILL PASS OVER AN AREA THAT HAS 
  ALREADY RECEIVED ABOUT 6 TO 10 INCHES OF RAINFALL IN THE PAST 12
  HOURS. ANY ADDITIONAL RAINFALL WILL BE EASILY CONVERTED TO RUNOFF  
  AND EXACERBATE ANY ONGOING FLOODING...AND COULD LEAD TO RAPID      
  RISES IN WATER LEVELS IN SOME LOCATIONS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GRADY...
  MIDWAY AND COOKS HAMMOCK

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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 2983 8317 2983 8335 2996 8335 3004 8301
      2999 8296 2997 8296 2995 8292 2990 8291

$$

08-LAMERS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 2:58 AM EDT	Flash Flood Warning	TAE	Dixie, Lafayette, Taylor	107 min
May 29, 4:41 AM EDT	Flash Flood Warning	TAE	Dixie, Lafayette, Taylor	3 hr
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; the sounding from the Mesonet's radiosonde archive.