Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 12, NWS Mobile, AL

March 9, 2011Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Mar 9, 2011, 8:41 AM CST for Baldwin County, Mobile County, Alabama. It was in force for 4 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 9, 2011, 8:41 AM CST (14:41 UTC)
Expired: Mar 9, 2011, 12:45 PM CST
In force: 4 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Baldwin County, AL, Mobile County, AL

The radar

The Mobile radar (KMOB), 26 km from the middle of the area, began a volume at 14:44 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.

What was reported inside it

Time	Report	Where	Remark
Mar 9, 10:00 AM CST	FLASH FLOOD	5 S Chickasaw, AL	FLOODED ROADS NEAR INTERSECTION OF SUMMERVILLE COURT AND UPHAM STREET. TIME ESTIMATED.
Mar 9, 10:00 AM CST	FLASH FLOOD	5 Ssw Chickasaw, AL	FLOODED ROADS AT INTERSECTION OF INTERSTATE 65 AND SPRINGHILL AVENUE. TIME ESTIMATED.
Mar 9, 10:00 AM CST	FLASH FLOOD	Bayou La Batre, AL	WATER OVER ROADS ON SHELL BELT ROAD WEST FROM WINTZELL AVENUE TO WARNER STREET WEST, RAILROAD STREET FROM WINTZELL AVENUE TO WARNER STREET WEST, AND HEMLEY STREET AT TAPIA AVENUE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.7 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-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: 1220 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 456 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 499 m²/s²
0-3 km storm-relative helicity: 571 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 19.4

Open this sounding in Storm Lab

The text

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

600 
WGUS54 KMOB 091441
FFWMOB
ALC003-097-091845-
/O.NEW.KMOB.FF.W.0012.110309T1441Z-110309T1845Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
841 AM CST WED MAR 9 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF SPANISH FORT...
  SOUTHERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITIES OF...TILLMANS CORNER...THEODORE...
  SATSUMA...SARALAND...PRICHARD...GRAND BAY...DOWNTOWN MOBILE...
  DAUPHIN ISLAND...CHICKASAW...BAYOU LA BATRE...

* UNTIL 1245 PM CST

* AT 837 AM CST...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
  RAIN FROM A LINE OF THUNDERSTORMS MOVING ACROSS SOUTHERN AND
  CENTRAL MOBILE COUNTY WHICH WILL MOVE INTO WEST CENTRAL BALDWIN
  COUNTY.  THESE STORMS HAVE BEEN PRODUCING UP TO 3 INCHES OF RAIN
  IN A SHORT AMOUNT OF TIME WHICH WILL QUICKLY LEAD TO FLASH
  FLOODING.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

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 3076 8842 3095 8783 3064 8792 3066 8794
      3065 8805 3038 8810 3032 8821 3027 8819
      3030 8811 3025 8806 3022 8831 3024 8832
      3027 8820 3037 8827 3039 8836 3022 8838

$$

2 follow-up statements

342 
WGUS74 KMOB 091645
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1045 AM CST WED MAR 9 2011

ALC003-097-091845-
/O.CON.KMOB.FF.W.0012.000000T0000Z-110309T1845Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALDWIN AL-MOBILE AL-
1045 AM CST WED MAR 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 PM CST FOR
SOUTHERN MOBILE AND WEST CENTRAL BALDWIN COUNTIES...

AT 1040 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES 
THAT 2 TO 3 INCHES OF RAIN HAS FALLEN OVER THE AREA.  SHOWERS AND 
THUNDERSTORMS CONTINUE TO MOVE ACROSS THE AREA AND SLOWLY SHIFT 
EASTWARD.  THESE STORMS STILL HAVE THE POTENTIAL TO PRODUCE AS MUCH 
AS AN ADDITIONAL 2 TO 2.5 INCHES OF RAIN...ESPECIALLY OVER THE 
SOUTHERN PORTION OF MOBILE COUNTY INCLUDING DAUPHIN ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST WEDNESDAY FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3076 8842 3095 8783 3064 8792 3066 8794
      3065 8805 3038 8810 3032 8821 3027 8819
      3030 8811 3025 8806 3022 8831 3024 8832
      3027 8820 3037 8827 3039 8836 3022 8838

$$

308 
WGUS74 KMOB 091845
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1245 PM CST WED MAR 9 2011

ALC003-097-091853-
/O.EXP.KMOB.FF.W.0012.000000T0000Z-110309T1845Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALDWIN AL-MOBILE AL-
1245 PM CST WED MAR 9 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1245 PM CST FOR SOUTHERN
MOBILE AND WEST CENTRAL BALDWIN COUNTIES...

AT 1243 PM CST...REPORTS FROM EMERGENCY MANAGEMENT AND LOCAL LAW 
ENFORCEMENT INDICATE THAT THE FLOODED AREAS HAVE SUBSIDED...THUS THE 
FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 1245 PM CST.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 PM CST WEDNESDAY
AFTERNOON FOR SOUTHWEST ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3076 8842 3095 8783 3064 8792 3066 8794
      3065 8805 3038 8810 3032 8821 3027 8819
      3030 8811 3025 8806 3022 8831 3024 8832
      3027 8820 3037 8827 3039 8836 3022 8838

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 8, 7:11 PM CST	Severe Thunderstorm Warning	MOB	Mobile, Washington	34 min
Mar 8, 8:23 PM CST	Severe Thunderstorm Warning	MOB	Washington	37 min
Mar 8, 9:04 PM CST	Severe Thunderstorm Warning	MOB	Clarke, Washington	41 min
Mar 8, 9:44 PM CST	Severe Thunderstorm Warning	MOB	Clarke, Washington, Wilcox	46 min
Mar 9, 1:32 AM CST	Flash Flood Warning	MOB	Choctaw	118 min
Mar 9, 4:20 AM CST	Flash Flood Warning	MOB	Choctaw	6 hr
Mar 9, 4:22 AM CST	Severe Thunderstorm Warning	MOB	Choctaw	38 min
Mar 9, 4:32 AM CST	Tornado Warning	MOB	Choctaw	33 min
Mar 9, 5:07 AM CST	Flash Flood Warning	MOB	Choctaw	6 hr
Mar 9, 5:40 AM CST	Tornado Warning	MOB	Choctaw, Clarke	33 min
Mar 9, 5:51 AM CST	Flash Flood Warning	MOB	Clarke, Washington, Wilcox	6 hr
Mar 9, 6:37 AM CST	Tornado Warning	MOB	Washington	17 min
Mar 9, 7:08 AM CST	Severe Thunderstorm Warning	MOB	Baldwin, Mobile, Washington	52 min
Mar 9, 7:26 AM CST	Flash Flood Warning	MOB	Baldwin, Clarke, Mobile, Washington	6 hr
Mar 9, 7:33 AM CST	Flash Flood Warning	MOB	Monroe	6 hr
Mar 9, 7:52 AM CST	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	83 min
Mar 9, 7:54 AM CST	Special Marine Warning	MOB		81 min
Mar 9, 8:01 AM CST	Tornado Warning	MOB	Baldwin, Mobile	44 min
Mar 9, 8:14 AM CST	Severe Thunderstorm Warning	MOB	Conecuh, Covington, Escambia	61 min
Mar 9, 8:27 AM CST	Tornado Warning	MOB	Baldwin, Mobile	63 min
Mar 9, 8:35 AM CST	Tornado Warning	MOB	Conecuh, Covington, Escambia	40 min
Mar 9, 8:48 AM CST	Flash Flood Warning	MOB	Conecuh, Escambia	5 hr
Mar 9, 8:50 AM CST	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw	40 min
Mar 9, 9:02 AM CST	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	58 min
Mar 9, 9:10 AM CST	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia	65 min
Mar 9, 9:10 AM CST	Tornado Warning	MOB	Baldwin	50 min
Mar 9, 9:16 AM CST	Tornado Warning	MOB	Baldwin	44 min
Mar 9, 9:16 AM CST	Tornado Warning	MOB	Covington	59 min
Mar 9, 9:19 AM CST	Special Marine Warning	MOB		116 min
Mar 9, 9:23 AM CST	Special Marine Warning	MOB		97 min
Mar 9, 9:25 AM CST	Flash Flood Warning	MOB	Baldwin	6 hr
Mar 9, 9:26 AM CST	Tornado Warning	MOB	Baldwin, Escambia	49 min
Mar 9, 9:26 AM CST	Tornado Warning	MOB	Covington, Crenshaw	26 min
Mar 9, 9:36 AM CST	Flash Flood Warning	MOB	Conecuh, Covington, Escambia	114 min
Mar 9, 9:40 AM CST	Tornado Warning	MOB	Baldwin	50 min
Mar 9, 9:44 AM CST	Areal Flood Advisory	MOB	Butler, Conecuh, Covington, Crenshaw	4 hr
Mar 9, 9:54 AM CST	Tornado Warning	MOB	Covington	25 min
Mar 9, 10:09 AM CST	Severe Thunderstorm Warning	MOB	Covington	66 min
Mar 9, 10:22 AM CST	Areal Flood Warning	MOB	Choctaw	5 hr
Mar 9, 10:55 AM CST	Special Marine Warning	MOB		80 min
Mar 9, 11:00 AM CST	Areal Flood Warning	MOB	Choctaw	5 hr
Mar 9, 11:14 AM CST	Tornado Warning	MOB	Baldwin	61 min
Mar 9, 11:30 AM CST	River Flood Warning	MOB	Clarke, Monroe, Wilcox	10 days
Mar 9, 11:54 AM CST	Areal Flood Advisory	MOB	Conecuh, Covington, Escambia	111 min
Mar 9, 11:58 AM CST	Special Marine Warning	MOB		2 hr
Mar 9, 12:00 PM CST	Areal Flood Warning	MOB	Clarke, Washington, Wilcox	4 hr
Mar 9, 2:02 PM CST	Special Marine Warning	MOB		58 min

Nearby

Flash Flood Warnings in Alabama, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.