Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 19, NWS Mobile, AL

March 8, 2011Clarke County, Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 8, 2011, 9:04 PM CST for Clarke County, Washington County, Alabama. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 8, 2011, 9:04 PM CST (03:04 UTC)
Expired: Mar 8, 2011, 9:45 PM CST
In force: 41 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Clarke County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 103 km from the middle of the area, began a volume at 03:05 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 8, 7:37 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 3.1 hours before the alert went out and 207 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 542 m²/s²
0-3 km storm-relative helicity: 664 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

165 
WUUS54 KMOB 090304
SVRMOB
ALC025-129-090345-
/O.NEW.KMOB.SV.W.0019.110309T0304Z-110309T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
904 PM CST TUE MAR 8 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CLARKE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF JACKSON...
  NORTHERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF CHATOM...

* UNTIL 945 PM CST

* AT 904 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 10 MILES NORTH OF CHATOM TO CHATOM TO 14 MILES NORTHEAST OF
  LEAKESVILLE...AND MOVING NORTHEAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SAINT STEPHRNS AND SAINT STEPHENS AROUND 940 PM CST...
  CORTELUOU AND JACKSON AROUND 945 PM CST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3167 8782 3138 8789 3129 8843 3146 8833
      3166 8826 3170 8809 3172 8804 3179 8785
TIME...MOT...LOC 0304Z 238DEG 25KT 3161 8818 3148 8821
          3133 8839

$$

PURDY

1 follow-up statement

572 
WWUS54 KMOB 090327
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
927 PM CST TUE MAR 8 2011

ALC025-129-090345-
/O.CON.KMOB.SV.W.0019.000000T0000Z-110309T0345Z/
WASHINGTON AL-CLARKE AL-
927 PM CST TUE MAR 8 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR CENTRAL CLARKE AND NORTHEASTERN WASHINGTON COUNTIES...

AT 926 PM CST...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS 
OVER 60 MPH.  THESE STORMS WERE ALONG A LINE EXTENDING FROM 15 MILES 
NORTHWEST OF JACKSON TO 7 MILES SOUTHEAST OF CHATOM...MOVING 
NORTHEAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  CORTELYOU...WINN...WAGARVILLE AND CORTELUOU AROUND 940 PM CST...
  LEROY...CLARKSVILLE...MCVAY AND ZIMCO AROUND 945 PM CST...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE
LOWEST FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY
OR A ROOM SUCH AS A CLOSET OR BATHROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CST WEDNESDAY MORNING
FOR SOUTHWEST ALABAMA AND SOUTHEAST MISSISSIPPI.

LAT...LON 3170 8809 3172 8804 3179 8785 3167 8782
      3143 8788 3137 8820 3151 8814 3169 8813
TIME...MOT...LOC 0326Z 238DEG 25KT 3169 8804 3156 8804
          3140 8816

$$

PURDY

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, 9:44 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, 8:41 AM CST	Flash Flood Warning	MOB	Baldwin, Mobile	4 hr
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

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm 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.