Alert archive / Alabama / Flash Flood Warnings in 2012

Flash Flood Warning 22, NWS Mobile, AL

June 11, 2012Choctaw County, Clarke County, Alabama

NWS Mobile, AL issued this flash flood warning at Jun 11, 2012, 9:55 PM CDT for Choctaw County, Clarke 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: Jun 11, 2012, 9:55 PM CDT (02:55 UTC)
Expired: Jun 12, 2012, 1:00 AM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, AL, Clarke County, AL

The radar

The Mobile radar (KMOB), 145 km from the middle of the area, began a volume at 02:55 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

Jackson, MS (KJAN), launched 00:00Z, 2.9 hours before the alert went out and 185 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2745 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1430 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

366 
WGUS54 KMOB 120255
FFWMOB
ALC023-025-120600-
/O.NEW.KMOB.FF.W.0022.120612T0255Z-120612T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
955 PM CDT MON JUN 11 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN CLARKE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 100 AM CDT

* AT 951 PM CDT...VERY HEAVY RAINFALL WAS INDICATED OVER THE WARNED
  AREA AND RADAR ESTIMATES SHOW RAINFALL RATES OF 2 TO 3 INCHES PER
  HOUR. THIS WILL LIKELY CAUSE FLASH FLOODING IN THE WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...
  TOXEY...              NEEDHAM...            GILBERTOWN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TO REPORT FLOODING...CALL (800) 284-9059.

&&

LAT...LON 3205 8811 3201 8811 3200 8810 3201 8808
      3199 8806 3199 8787 3183 8787 3184 8847
      3193 8848 3205 8846

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 8:43 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	62 min
Jun 11, 9:10 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke	65 min
Jun 11, 10:27 PM CDT	Severe Thunderstorm Warning	MOB	Clarke, Conecuh, Monroe, Washington, Wilcox	63 min
Jun 11, 11:05 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Escambia, Mobile, Monroe, Washington	55 min
Jun 11, 11:13 PM CDT	Special Marine Warning	MOB		2 hr
Jun 12, 1:16 AM CDT	Special Marine Warning	MOB		89 min
Jun 12, 5:06 PM CDT	River Flood Warning	MOB	Baldwin	19 hr
Jun 12, 5:42 PM CDT	River Flood Warning	MOB	Baldwin	27 hr

Nearby

Flash Flood Warnings in Alabama, 2012 Every 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.