Alert archive / Alabama / Flash Flood Warnings in 2012

Flash Flood Warning 6, NWS Mobile, AL

February 18, 2012Escambia County, Okaloosa County, Santa Rosa County, Florida; 6 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Feb 18, 2012, 5:13 PM CST for Escambia County, Okaloosa County, Santa Rosa County, Florida; 6 counties in Alabama. It was in force for 2 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
Feb 18, 2012, 5:13 PM CST (23:13 UTC)
Expired
Feb 18, 2012, 7:15 PM CST
In force
2 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Butler County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 84 km from the middle of the area, began a volume at 23:16 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, 11.2 hours before the alert went out and 218 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 2012-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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, Tallahassee Rgnl, FL at 12:00Z on 2012-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939587897117136Sfc1 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
548 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
73 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.

704 
WGUS54 KMOB 182313
FFWMOB
ALC003-013-035-039-041-053-FLC033-091-113-190115-
/O.NEW.KMOB.FF.W.0006.120218T2313Z-120219T0115Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
513 PM CST SAT FEB 18 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITIES OF...MOLINO...CENTURY...
  NORTHERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITY OF CRESTVIEW...
  NORTHERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  SOUTHEASTERN BUTLER COUNTY IN SOUTH CENTRAL ALABAMA...
  SOUTHEASTERN CONECUH COUNTY IN SOUTH CENTRAL ALABAMA...
  COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  THIS INCLUDES THE CITIES OF...OPP...FLORALA...ANDALUSIA...
  SOUTHERN CRENSHAW COUNTY IN SOUTH CENTRAL ALABAMA...
  EASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...
  THIS INCLUDES THE CITY OF EAST BREWTON...
  EAST CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 715 PM CST

* AT 506 PM CST...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
  RAIN FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES SOUTH
  OF BRANTLEY TO POINT BAKER...OR ALONG A LINE EXTENDING FROM 10
  MILES WEST OF ELBA TO MILTON...MOVING EAST AT 45 MPH.

* THUNDERSTORMS PRODUCING VERY HEAVY RAIN WILL BE NEAR...
  HORN HILL...HAROLD AND OPP BY 520 PM CST...
  BAKER AND ONYCHA BY 525 PM CST...
  LAUREL HILL...LOCKHART AND FLORALA BY 540 PM CST...
  CRESTVIEW BY 545 PM CST...

ADDITIONAL RAINFALL AMOUNTS OF UP TO AN INCH AND HALF ARE POSSIBLE 
OVER 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 3152 8619 3101 8618 3099 8620 3098 8639
      3077 8638 3069 8642 3060 8769 3164 8648
      3163 8618 3162 8614 3154 8614

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 18, 3:38 AM CSTWind AdvisoryMOB38 hr
Feb 18, 3:13 PM CSTSevere Thunderstorm WarningMOBEscambia, Santa Rosa47 min
Feb 18, 3:37 PM CSTFlash Flood WarningMOBEscambia113 min
Feb 18, 4:01 PM CSTSevere Thunderstorm WarningMOBEscambia, Okaloosa, Santa Rosa44 min
Feb 18, 4:38 PM CSTSevere Thunderstorm WarningMOBOkaloosa, Santa Rosa52 min
Feb 18, 4:52 PM CSTFlash Flood WarningMOBEscambia113 min
Feb 18, 4:59 PM CSTSevere Thunderstorm WarningMOBEscambia, Santa Rosa76 min
Feb 18, 5:17 PM CSTTornado WarningMOBEscambia28 min
Feb 18, 1:56 PM CSTSevere Thunderstorm WarningMOBBaldwin, Mobile49 min
Feb 18, 2:28 PM CSTFlash Flood WarningMOBMobile, Washington32 days
Feb 18, 3:28 PM CSTGale WarningMOB21 hr
Feb 18, 3:59 PM CSTSevere Thunderstorm WarningMOBBaldwin, Mobile61 min
Feb 18, 4:07 PM CSTSpecial Marine WarningMOB83 min
Feb 18, 4:19 PM CSTFlash Flood WarningMOBBaldwin, Mobile116 min
Feb 18, 4:21 PM CSTTornado WarningMOBMobile24 min
Feb 18, 4:25 PM CSTAreal Flood AdvisoryMOBChoctaw, Clarke, Monroe, Washington, Wilcox2 hr
Feb 18, 4:30 PM CSTFlash Flood WarningMOBMobile, Washington60 min
Feb 18, 5:27 PM CSTSpecial Marine WarningMOB93 min

Nearby

Flash Flood Warnings in Alabama, 2012Flash 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.