Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 25, NWS Mobile, AL

September 3, 2011Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Sep 3, 2011, 2:19 PM CDT for Mobile County, Alabama. 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
Sep 3, 2011, 2:19 PM CDT (19:19 UTC)
Expired
Sep 3, 2011, 6:15 PM CDT
In force
4 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Mobile County, AL

The radar

The Mobile radar (KMOB), 24 km from the middle of the area, began a volume at 19:20 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, 7.3 hours before the alert went out and 147 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 2011-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 850 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, Slidell Radar S, LA at 12:00Z on 2011-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 286 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
850 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
286 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
1.0
Supercell composite
7.0

Open this sounding in Storm Lab

The text

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

231 
WGUS54 KMOB 031919
FFWMOB
ALC097-032315-
/O.NEW.KMOB.FF.W.0025.110903T1919Z-110903T2315Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
219 PM CDT SAT SEP 3 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL MOBILE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITIES OF...TILLMANS CORNER...THEODORE...BAYOU LA
  BATRE...

* UNTIL 615 PM CDT

* AT 211 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED BANDS OF 
HEAVY RAIN SHOWERS AND THUNDERSTORM HAVE PRODUCED RAINFALL AMOUNTS 
OF 2 TO 4 INCHES OVER THE WARNED AREA.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA IN THE NEXT IN THE NEXT TWO HOURS.

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

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 3034 8821 3036 8820 3037 8826 3044 8832
      3060 8835 3064 8833 3065 8826 3062 8811
      3053 8808 3051 8809 3048 8808 3045 8810
      3036 8810 3031 8813

$$

JW
1 follow-up statement
464 
WGUS74 KMOB 032314
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
614 PM CDT SAT SEP 3 2011

ALC097-032320-
/O.EXP.KMOB.FF.W.0025.000000T0000Z-110903T2315Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOBILE AL-
614 PM CDT SAT SEP 3 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 615 PM CDT FOR SOUTH
CENTRAL MOBILE COUNTY...

RADAR INDICATES THE HEAVIEST BAND OF SHOWERS AND THUNDERSTORMS 
MOVING OUT OF THE WARNED AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING
FOR SOUTHWEST ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3034 8821 3036 8820 3037 8826 3044 8832
      3060 8835 3064 8833 3065 8826 3062 8811
      3053 8808 3051 8809 3048 8808 3045 8810
      3036 8810 3031 8813

$$

JW

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 10:37 PM CDTTropical Storm WarningMOB47 hr
Sep 3, 1:44 AM CDTSpecial Marine WarningMOB46 min
Sep 3, 2:13 AM CDTSpecial Marine WarningMOB47 min
Sep 3, 3:38 AM CDTSpecial Marine WarningMOB22 min
Sep 3, 4:00 AM CDTSpecial Marine WarningMOB30 min
Sep 3, 4:31 AM CDTSpecial Marine WarningMOB44 min
Sep 3, 9:15 AM CDTRiver Flood WarningMOBBaldwin24 hr
Sep 3, 9:16 AM CDTRiver Flood WarningMOBBaldwin24 hr
Sep 3, 9:19 AM CDTRiver Flood WarningMOBBaldwin24 hr
Sep 3, 10:59 AM CDTSpecial Marine WarningMOB46 min
Sep 3, 12:14 PM CDTSpecial Marine WarningMOB46 min
Sep 3, 12:53 PM CDTTornado WarningMOBMobile22 min
Sep 3, 1:00 PM CDTSpecial Marine WarningMOB21 min
Sep 3, 1:29 PM CDTSpecial Marine WarningMOB61 min
Sep 3, 1:50 PM CDTRiver Flood WarningMOBMobile31 hr
Sep 3, 2:00 PM CDTTornado WarningMOBMobile16 min
Sep 3, 2:14 PM CDTTornado WarningMOBMobile33 min
Sep 3, 4:10 PM CDTSpecial Marine WarningMOB15 min
Sep 3, 4:53 PM CDTFlash Flood WarningMOBMobile3 hr
Sep 3, 5:00 PM CDTSpecial Marine WarningMOB45 min
Sep 3, 5:33 PM CDTSpecial Marine WarningMOB42 min
Sep 3, 6:06 PM CDTSpecial Marine WarningMOB39 min
Sep 3, 6:09 PM CDTTornado WarningMOBMobile51 min

Nearby

Flash 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.