Alert archive / Alabama / Flash Flood Warnings in 2012

Flash Flood Warning 11, NWS Mobile, AL

March 22, 20126 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Mar 22, 2012, 3:45 PM CDT for 6 counties in Alabama. It was in force for 6 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
Mar 22, 2012, 3:45 PM CDT (20:45 UTC)
Expired
Mar 22, 2012, 9:45 PM CDT
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Clarke County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 52 km from the middle of the area, began a volume at 20:47 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.8 hours before the alert went out and 192 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, Slidell Radar S, LA at 12:00Z on 2012-03-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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, Slidell Radar S, LA at 12:00Z on 2012-03-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 square meters per square second.19395878Sfc1 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
438 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
377 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

314 
WGUS54 KMOB 222045
FFWMOB
ALC003-025-053-097-099-129-230245-
/O.NEW.KMOB.FF.W.0011.120322T2045Z-120323T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
345 PM CDT THU MAR 22 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...
  WESTERN MONROE COUNTY IN SOUTH CENTRAL ALABAMA...
  NORTHWESTERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  SOUTHEASTERN CLARKE COUNTY IN SOUTHWEST ALABAMA...
  NORTHEASTERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  SOUTHEASTERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 945 PM CDT

* AT 336 PM CDT...RADAR INDICATED VERY HEAVY RAIN THAT HAS FALLEN    
  FROM SLOW MOVING THUNDERSTORMS FROM NEAR GROVE HILL TO MCINTOSH TO
  PRICHARD ALABAMA. FOUR TO FIVE INCHES OF RAIN HAS FALLEN SINCE 1 PM
  ALONG AND TO THE WEST OF THIS LINE.  THESE STORMS WILL CONTINUE
  MOVING SLOWLY EAST AS INDIVIDUAL CELLS REPEATEDLY MOVE OVER THE
  SAME AREAS.  

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOWA
  CHOCTAW RESERVATION...ROCKVILLE...CALVERT...WHATLEY...WALKER
  SPRINGS...CARLTON...URIAH...MCINTOSH...MALCOLM...LEROY AND FAIRFORD

RAINFALL AMOUNTS OF 4 TO 5 INCHES PER THREE HOURS IS POSSIBLE IN THE 
WARNED AREAS AS WELL AS 2.5 TO 3.5 INCHES OF RAIN IN AN HOUR.

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 3073 8817 3084 8826 3099 8825 3162 8791
      3175 8746 3132 8749 3090 8765 3070 8801

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 22, 8:50 AM CDTSevere Thunderstorm WarningMOBWashington55 min
Mar 22, 10:26 AM CDTSpecial Marine WarningMOB49 min
Mar 22, 11:00 AM CDTSevere Thunderstorm WarningMOBChoctaw45 min
Mar 22, 11:13 AM CDTSpecial Marine WarningMOB2 hr
Mar 22, 11:38 AM CDTSevere Thunderstorm WarningMOBClarke, Washington67 min
Mar 22, 1:05 PM CDTSpecial Marine WarningMOB115 min
Mar 22, 1:36 PM CDTFlash Flood WarningMOBClarke, Mobile, Washington6 hr
Mar 22, 2:53 PM CDTAreal Flood AdvisoryMOBMobile3 hr
Mar 22, 3:17 PM CDTSpecial Marine WarningMOB43 min
Mar 22, 4:01 PM CDTAreal Flood WarningMOBChoctaw, Clarke, Washington12 hr
Mar 22, 4:25 PM CDTSevere Thunderstorm WarningMOBWilcox50 min
Mar 22, 5:43 PM CDTSpecial Marine WarningMOB62 min
Mar 22, 6:46 PM CDTSpecial Marine WarningMOB89 min
Mar 22, 6:51 PM CDTSevere Thunderstorm WarningMOBBaldwin, Conecuh, Escambia, Monroe54 min

Nearby

Flash Flood Warnings in Alabama, 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.