Alert archive / Florida / Flash Flood Warnings in 2012

Flash Flood Warning 30, NWS Tallahassee, FL

August 7, 2012Holmes County, Florida

NWS Tallahassee, FL issued this flash flood warning at Aug 7, 2012, 7:30 AM CDT for Holmes County, Florida. It was in force for 2 hr. 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
Aug 7, 2012, 7:30 AM CDT (12:30 UTC)
Expired
Aug 7, 2012, 9:30 AM CDT
In force
2 hr
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon
Flood severity
None

County Holmes County, FL

The radar

The Eglin Afb radar (KEVX), 44 km from the middle of the area, began a volume at 12:33 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

TimeReportWhereRemark
Aug 7, 9:27 AM CDTFLASH FLOOD1 Nw Smith Crossroads, FLGENEVA COUNTY EMERGENCY MANAGER REPORTS THAT COUNTY ROAD 53 IS CLOSED THAT THE FLORIDA/GEORGIA BORDER DUE TO WATER OVER ROADWAY.

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, 0.5 hours before the alert went out and 157 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2012-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1301 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2012-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1301 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
755 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
66 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.

472 
WGUS52 KTAE 071230
FFWTAE
FLC059-071430-
/O.NEW.KTAE.FF.W.0030.120807T1230Z-120807T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
730 AM CDT TUE AUG 7 2012

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN HOLMES COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 930 AM CDT

* AT 716 AM CDT...THE NATIONAL WEATHER SERVICE HAS DETECTED FLASH    
  FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA. THESE SLOW       
  MOVING STORMS HAVE BEEN PRODUCING RAINFALL RATES OF 1 TO 2 INCHES  
  PER HOUR WITH TOTAL ACCUMULATIONS OF UP TO 5 TO 8 INCHES POSSIBLE.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SMITH
  CROSSROADS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

* REPORT FLOODING OR FLOOD DAMAGE TO THE NATIONAL WEATHER SERVICE IN
TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3099 8591 3100 8568 3087 8567 3088 8592

$$

17-GOULD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 2:32 AM CDTFlash Flood WatchTAEBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 10 more24 hr
Aug 7, 8:38 AM CDTSpecial Marine WarningTAE67 min
Aug 7, 9:30 AM CDTFlash Flood WarningTAEHolmes, Washington87 min
Aug 7, 10:02 AM CDTSpecial Weather StatementTAEWashington28 min
Aug 7, 10:07 AM CDTRiver Flood WatchTAEWakulla6 days
Aug 7, 10:19 AM CDTRiver Flood WatchTAEHolmes, Washington21 days
Aug 7, 11:34 AM CDTSpecial Weather StatementTAELeon41 min
Aug 7, 11:58 AM CDTAreal Flood AdvisoryTAELeon92 min
Aug 7, 1:28 PM CDTSpecial Weather StatementTAEWalton62 min
Aug 7, 1:53 PM CDTSpecial Marine WarningTAE67 min
Aug 7, 2:35 PM CDTRip Current StatementTAEBay, Franklin, Gulf, Walton3 days
Aug 7, 4:25 PM CDTAreal Flood AdvisoryTAELafayette, Taylor3 hr

Nearby

Flash Flood Warnings in Florida, 2012Every 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; radar from the NEXRAD Level II archive.