Alert archive / Florida / Flash Flood Warnings in 2011

Flash Flood Warning 31, NWS Mobile, AL

September 4, 2011Okaloosa County, Santa Rosa County, Florida; Covington County, Escambia County, Alabama

NWS Mobile, AL issued this flash flood warning at Sep 4, 2011, 5:36 AM CDT for Okaloosa County, Santa Rosa County, Florida; Covington County, Escambia County, Alabama. 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
Sep 4, 2011, 5:36 AM CDT (10:36 UTC)
Expired
Sep 4, 2011, 8:30 AM CDT
In force
3 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Covington County, AL, Escambia County, AL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 99 km from the middle of the area, began a volume at 10:39 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

Birmingham, AL (KBMX), launched 00:00Z, 10.6 hours before the alert went out and 229 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, Birmingham, AL at 00:00Z on 2011-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2011-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2052 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
90 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.

969 
WGUS54 KMOB 041036
FFWMOB
ALC039-053-FLC091-113-041330-
/O.NEW.KMOB.FF.W.0031.110904T1036Z-110904T1330Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
536 AM CDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  NORTHEASTERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  SOUTHWESTERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  EASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 830 AM CDT

* AT 529 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
  RAIN FROM A SERIES OF THUNDERSTORMS MOVING NORTHWARD ACROSS
  EXTREME NORTHEASTERN SANTA ROSA AND EXTREME NORTHWESTERN OKALOOSA
  COUNTIES IN NORTHWEST FLORIDA...AND SOUTHWESTERN COVINGTON AND
  EASTERN ESCAMBIA COUNTIES IN SOUTH CENTRAL ALABAMA.  THESE STORMS
  ARE PRODUCING AROUND 2 INCHES OF RAIN OVER AN HOUR AND ADDITIONAL
  RAINFALL AMOUNTS AROUND 2 INCHES ARE POSSIBLE IN THE WARNED AREA.

TO REPORT FLASH FLOODING TO YOUR NATIONAL WEATHER SERVICE...CALL TOLL
FREE AT 1 8 7 7 6 3 3 6 7 7 2.

LAT...LON 3085 8666 3078 8695 3126 8684 3126 8677
      3119 8676 3120 8674 3119 8672 3120 8670
      3127 8670 3127 8657

$$
2 follow-up statements
504 
WGUS74 KMOB 041057
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
557 AM CDT SUN SEP 4 2011

ALC039-053-FLC091-113-041330-
/O.CON.KMOB.FF.W.0031.000000T0000Z-110904T1330Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COVINGTON AL-ESCAMBIA AL-OKALOOSA FL-SANTA ROSA FL-
557 AM CDT SUN SEP 4 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 AM CDT FOR
NORTHEASTERN SANTA ROSA...NORTHWESTERN OKALOOSA...SOUTHEASTERN
ESCAMBIA AND SOUTHWESTERN COVINGTON COUNTIES...

AT 549 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE HEAVY RAINS OVER THE WARNED AREA.  DOPPLER RADAR RAINFALL 
ESTIMATES SHOW AROUND 2 INCHES OF RAIN HAS FALLEN OVER THE WARNED 
AREA...WITH AMOUNTS NEARING 3 INCHES NEAR THE BORDER OF ESCAMBIA AND 
COVINGTON COUNTIES...NEAR THE COMMUNITIES OF DIXIE AND BRADLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 AM CDT SUNDAY MORNING FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI.
A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY
AFTERNOON FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND
SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3085 8666 3078 8695 3117 8686 3119 8679
      3119 8676 3120 8675 3119 8673 3120 8670
      3127 8670 3127 8657

$$
433 
WGUS74 KMOB 041328
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
828 AM CDT SUN SEP 4 2011

ALC039-053-FLC091-113-041334-
/O.EXP.KMOB.FF.W.0031.000000T0000Z-110904T1330Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COVINGTON AL-ESCAMBIA AL-OKALOOSA FL-SANTA ROSA FL-
828 AM CDT SUN SEP 4 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 830 AM CDT FOR NORTHEASTERN
SANTA ROSA...NORTHWESTERN OKALOOSA...SOUTHEASTERN ESCAMBIA AND
SOUTHWESTERN COVINGTON COUNTIES...

THE THREAT OF FLASH FLOODING HAS DIMINISHED AND IS NO LONGER 
EXPECTED.  HOWEVER...PONDING OF WATER IN LOW LYING AREAS AND 
ROADWAYS WILL PERSIST THROUGH THE MORNING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3085 8666 3078 8695 3117 8686 3119 8679
      3119 8676 3120 8675 3119 8673 3120 8670
      3127 8670 3127 8657

$$

JW

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 7:53 PM CDTAreal Flood WarningMOBEscambia, Okaloosa, Santa Rosa6 hr
Sep 3, 9:11 PM CDTRiver Flood WarningMOBOkaloosa, Santa Rosa12 hr
Sep 3, 9:11 PM CDTRiver Flood WarningMOBOkaloosa, Santa Rosa12 hr
Sep 3, 9:11 PM CDTRiver Flood WarningMOBOkaloosa49 hr
Sep 4, 3:57 AM CDTTornado WarningMOBEscambia, Santa Rosa42 min
Sep 4, 4:15 AM CDTTornado WarningMOBEscambia, Okaloosa, Santa Rosa60 min
Sep 4, 5:04 AM CDTTornado WarningMOBOkaloosa41 min
Sep 4, 9:42 AM CDTTornado WarningMOBOkaloosa33 min
Sep 4, 4:15 PM CDTTornado WarningMOBEscambia60 min
Sep 3, 8:02 PM CDTSpecial Marine WarningMOB43 min
Sep 3, 8:24 PM CDTSpecial Marine WarningMOB51 min
Sep 3, 10:34 PM CDTSpecial Marine WarningMOB41 min
Sep 3, 11:11 PM CDTTornado WarningMOBMobile64 min
Sep 3, 11:58 PM CDTTornado WarningMOBMobile62 min
Sep 4, 12:13 AM CDTSpecial Marine WarningMOB2 hr
Sep 4, 12:59 AM CDTTornado WarningMOBMobile61 min
Sep 4, 1:14 AM CDTFlash Flood WarningMOBMobile3 hr
Sep 4, 1:40 AM CDTFlash Flood WarningMOBMobile3 hr
Sep 4, 1:59 AM CDTTornado WarningMOBMobile45 min
Sep 4, 2:16 AM CDTSpecial Marine WarningMOB119 min
Sep 4, 2:46 AM CDTTornado WarningMOBBaldwin59 min
Sep 4, 3:16 AM CDTSpecial Marine WarningMOB119 min
Sep 4, 4:49 AM CDTSpecial Marine WarningMOB86 min
Sep 4, 5:51 AM CDTSpecial Marine WarningMOB114 min
Sep 4, 9:42 AM CDTSpecial Marine WarningMOB33 min
Sep 4, 9:59 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington4 days
Sep 4, 9:59 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington5 days
Sep 4, 10:43 AM CDTSpecial Marine WarningMOB47 min
Sep 4, 10:44 AM CDTSpecial Marine WarningMOB46 min
Sep 4, 11:29 AM CDTSpecial Marine WarningMOB46 min
Sep 4, 11:46 AM CDTTornado WarningMOBBaldwin, Mobile19 min
Sep 4, 12:12 PM CDTTornado WarningMOBWashington63 min
Sep 4, 12:58 PM CDTTornado WarningMOBWashington62 min
Sep 4, 1:20 PM CDTTornado WarningMOBClarke, Washington55 min
Sep 4, 4:01 PM CDTTornado WarningMOBChoctaw, Clarke59 min
Sep 4, 4:09 PM CDTTornado WarningMOBWashington36 min
Sep 4, 4:28 PM CDTTornado WarningMOBBaldwin49 min

Nearby

Flash Flood Warnings in Florida, 2011Flash Flood Warnings in Alabama, 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.