Alert archive / Florida / Flash Flood Warnings in 2011

Flash Flood Warning 24, NWS Mobile, AL

July 17, 2011Escambia County, Santa Rosa County, Florida

NWS Mobile, AL issued this flash flood warning at Jul 17, 2011, 8:01 AM CDT for Escambia County, Santa Rosa County, Florida. It was in force for 4 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
Jul 17, 2011, 8:01 AM CDT (13:01 UTC)
Expired
Jul 17, 2011, 12:00 PM CDT
In force
4 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Escambia County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 103 km from the middle of the area, began a volume at 13:05 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, 1.0 hours before the alert went out and 259 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 2011-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 616 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 2011-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
616 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
721 m above ground
0-6 km bulk shear
1 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
87 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.

518 
WGUS54 KMOB 171301
FFWMOB
FLC033-113-171700-
/O.NEW.KMOB.FF.W.0024.110717T1301Z-110717T1700Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
801 AM CDT SUN JUL 17 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN ESCAMBIA COUNTY AND SOUTHERN SANTA ROSA COUNTY IN
  NORTHWEST FLORIDA...
  THIS INCLUDES THE CITIES OF...WEST PENSACOLA...WARRINGTON...
  MYRTLE GROVE...GOULDING...GONZALEZ...FERRY PASS...ENSLEY...
  BRENT...PACE...MILTON...GULF BREEZE AND BAGDAD...

* UNTIL NOON CDT

* AT 800 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
  RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WHITING
  FIELD...WALLACE...SPRINGHILL...SKYLINE...ROEVILLE...POINT BAKER...
  EAST MILTON...MUNSON...HAROLD...CHUMUCKLA AND ALLENTOWN

SOME LOCATIONS IN THE WARNING AREA HAVE RECEIVED 4 TO 5 INCHES OF 
RAINFALL SINCE MIDNIGHT. ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 
INCHES ARE POSSIBLE IN THE WARNED AREA THROUGH NOON. THIS ADDITIONAL 
RAINFALL COULD RESULT IN RAPID FLASH FLOODING OF FLOOD PRONE AREAS. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

REPORT FLASH FLOODING TO YOUR NATIONAL WEATHER SERVICE IN MOBILE AT
AREA CODE 2 5 1...AND THEN 6 3 3 6 4 4 3. OR...YOU MAY CONTACT YOUR
NEAREST LAW ENFORCEMENT AGENCY OR COUNTY EMERGENCY MANAGEMENT...AND
THEY WILL RELAY YOUR REPORT.

LAT...LON 3032 8732 3078 8729 3088 8679 3055 8679
      3055 8678 3055 8679 3042 8679 3041 8680
      3041 8679 3038 8679 3035 8704 3031 8726

$$

PURDY

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 16, 7:42 PM CDTAreal Flood AdvisoryMOBOkaloosa2 hr
Jul 16, 11:19 PM CDTAreal Flood AdvisoryMOBEscambia, Okaloosa, Santa Rosa4 hr
Jul 16, 11:30 PM CDTFlash Flood WarningMOBEscambia, Okaloosa, Santa Rosa4 hr

Nearby

Flash Flood Warnings in Florida, 2011Every flash flood warning in 2011

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.