Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 17, NWS Birmingham, AL

April 16, 2011Chambers County, Randolph County, Tallapoosa County, Alabama

NWS Birmingham, AL issued this flash flood warning at Apr 16, 2011, 12:36 AM CDT for Chambers County, Randolph County, Tallapoosa 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
Apr 16, 2011, 12:36 AM CDT (05:36 UTC)
Expired
Apr 16, 2011, 3:30 AM CDT
In force
3 hr
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Flood severity
None

Counties Chambers County, AL, Randolph County, AL, Tallapoosa County, AL

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 5.6 hours before the alert went out and 91 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 406 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 373 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
406 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
373 m²/s²
0-3 km storm-relative helicity
566 m²/s²
Significant tornado parameter
1.3
Supercell composite
11.3

Open this sounding in Storm Lab

The text

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

857 
WGUS54 KBMX 160536
FFWBMX
ALC017-111-123-160830-
/O.NEW.KBMX.FF.W.0017.110416T0536Z-110416T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1236 AM CDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN TALLAPOOSA COUNTY IN EAST CENTRAL ALABAMA...
  NORTHERN CHAMBERS COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHEASTERN RANDOLPH COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 330 AM CDT

* AT 1235 AM CDT...NATIONAL WEATHER SERVICE INDICATED SLOW MOVING   
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
RAINFALL AMOUNTS OF 1 TO 2 INCHES HAS BEEN INDICATED WITH ANOTHER 
POSSIBLE 1 TO 2 INCHES IN THE NEXT HOUR.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ROANOKE...STROUD...ABANDA...CRYSTAL LAKE...NEW SITE...PENTON...POST
  OAK FORKS...RED LEVEL...SPARKLING SPRINGS...TRAMMEL CROSSROADS...
  WADLEY...WELCH AND WHITE PLAINS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3302 8522 3291 8580 3303 8582 3315 8554
      3335 8541 3338 8528 3317 8523

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 7:03 PM CDTTornado WarningBMXAutauga, Chilton, Dallas, Perry57 min
Apr 15, 7:06 PM CDTTornado WarningBMXLowndes, Montgomery39 min
Apr 15, 7:09 PM CDTTornado WarningBMXDallas, Marengo, Perry66 min
Apr 15, 7:33 PM CDTAreal Flood AdvisoryBMXMarengo3 hr
Apr 15, 7:41 PM CDTTornado WarningBMXChilton, Coosa28 min
Apr 15, 8:10 PM CDTTornado WarningBMXAutauga, Chilton, Dallas, Perry50 min
Apr 15, 8:52 PM CDTTornado WarningBMXAutauga, Elmore38 min
Apr 15, 9:15 PM CDTTornado WarningBMXAutauga, Chilton, Coosa, Elmore30 min
Apr 15, 9:19 PM CDTTornado WarningBMXAutauga, Dallas, Lowndes41 min
Apr 15, 9:37 PM CDTTornado WarningBMXCoosa, Elmore, Tallapoosa38 min
Apr 15, 10:32 PM CDTSevere Thunderstorm WarningBMXAutauga, Chilton, Coosa, Dallas, Elmore, Lowndes and 2 more28 min
Apr 15, 10:43 PM CDTSevere Thunderstorm WarningBMXCalhoun, Clay, Cleburne, Coosa, Randolph, Talladega and 1 more32 min
Apr 15, 10:44 PM CDTTornado WarningBMXAutauga, Coosa, Elmore46 min
Apr 15, 11:20 PM CDTSevere Thunderstorm WarningBMXLowndes, Montgomery, Pike40 min
Apr 15, 11:21 PM CDTTornado WarningBMXChambers, Coosa, Elmore, Tallapoosa54 min
Apr 15, 11:28 PM CDTSevere Thunderstorm WarningBMXChambers, Clay, Cleburne, Randolph, Tallapoosa47 min
Apr 15, 11:52 PM CDTSevere Thunderstorm WarningBMXBullock, Macon, Montgomery, Pike38 min
Apr 15, 11:53 PM CDTTornado WarningBMXChambers, Randolph, Tallapoosa52 min
Apr 16, 12:14 AM CDTSevere Thunderstorm WarningBMXBullock, Montgomery, Pike46 min
Apr 16, 12:41 AM CDTSevere Thunderstorm WarningBMXBullock, Lee, Macon, Russell34 min
Apr 16, 12:55 AM CDTSevere Thunderstorm WarningBMXBullock, Macon, Montgomery, Pike50 min
Apr 16, 1:26 AM CDTSevere Thunderstorm WarningBMXBullock, Lee, Macon, Russell49 min
Apr 16, 2:11 AM CDTSevere Thunderstorm WarningBMXLee, Russell19 min
Apr 16, 2:58 AM CDTSpecial Weather StatementBMXRussell47 min
Apr 16, 4:13 AM CDTWind AdvisoryBMXAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more15 hr

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.