Alert archive / Alabama / Flash Flood Warnings in 2009

Flash Flood Warning 30, NWS Mobile, AL

May 6, 2009Choctaw County, Alabama

NWS Mobile, AL issued this flash flood warning at May 6, 2009, 1:05 PM CDT for Choctaw 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: May 6, 2009, 1:05 PM CDT (18:05 UTC)
Expired: May 6, 2009, 4:00 PM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 131 km from the middle of the area, began a volume at 18:08 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 12:00Z, 6.1 hours before the alert went out and 187 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: 2140 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 10.8

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMOB 061805
FFWMOB
ALC023-062100-
/O.NEW.KMOB.FF.W.0030.090506T1805Z-090506T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
105 PM CDT WED MAY 6 2009

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 400 PM CDT

* AT 102 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THAT 2 TO 2.5 INCHES OF RAIN HAS FALLEN OVER SOUTH CENTRAL CHOCTAW
  COUNTY.  FLASH FLOODING WILL RESULT AS SEVERAL THUNDERSTORMS
  CONTINUE TO MOVE ACROSS THE AREA WITH ADDITIONAL RAINFALL AMOUNTS
  OF 1 TO 2 INCHES POSSIBLE IN A SHORT AMOUNT OF TIME.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WOMACK HILL
  AND BARRYTOWN

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

LAT...LON 3191 8810 3190 8813 3187 8813 3186 8816
      3184 8816 3183 8818 3176 8815 3170 8842
      3185 8836 3195 8811 3194 8810

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 9:38 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	8 days
May 6, 9:38 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	7 days
May 6, 10:59 AM CDT	Areal Flood Advisory	MOB	Choctaw	2 hr
May 6, 1:45 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	20 min
May 6, 2:01 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Wilcox	44 min
May 6, 2:06 PM CDT	Areal Flood Advisory	MOB	Wilcox	3 hr
May 6, 2:52 PM CDT	Flash Flood Warning	MOB	Clarke	109 min
May 6, 3:11 PM CDT	Severe Thunderstorm Warning	MOB	Washington	53 min
May 6, 3:16 PM CDT	Flash Flood Warning	MOB	Choctaw, Clarke, Washington	2 hr
May 6, 3:29 PM CDT	Severe Thunderstorm Warning	MOB	Clarke, Monroe, Washington	45 min
May 6, 3:33 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Crenshaw, Monroe, Wilcox	57 min
May 6, 3:34 PM CDT	Flash Flood Watch	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 3 more	5 hr
May 6, 3:54 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Clarke, Conecuh, Monroe	66 min
May 6, 4:58 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Covington, Crenshaw	47 min
May 6, 5:50 PM CDT	Severe Thunderstorm Warning	MOB	Covington	25 min

Nearby

Flash Flood Warnings in Alabama, 2009 Every flash flood warning in 2009

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.