Alert archive / Mississippi / Tornado Warnings in 2011

Tornado Warning 115, NWS Mobile, AL

September 4, 2011Wayne County, Mississippi

NWS Mobile, AL issued this tornado warning at Sep 4, 2011, 2:01 PM CDT for Wayne County, Mississippi. It was in force for 59 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
Sep 4, 2011, 2:01 PM CDT (19:01 UTC)
Expired
Sep 4, 2011, 3:00 PM CDT
In force
59 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Wayne County, MS

The radar

The Mobile radar (KMOB), 121 km from the middle of the area, began a volume at 19:02 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.

IssuedProductOfficeLasted
Sep 4, 5:05 AM CDTTornado WatchSPC11 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.0 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-pSkew-T log-p diagram, Jackson, MS at 12:00Z on 2011-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 307 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 12:00Z on 2011-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 square meters per square second.193958Sfc1 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
307 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
490 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
279 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

693 
WFUS54 KMOB 041901
TORMOB
MSC153-042000-
/O.NEW.KMOB.TO.W.0115.110904T1901Z-110904T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
201 PM CDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL WAYNE COUNTY IN SOUTHEAST MISSISSIPPI...

* UNTIL 300 PM CDT

* AT 158 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 11 MILES SOUTH OF
  WAYNESBORO...OR 4 MILES SOUTH OF CLARA...MOVING NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WAYNESBORO...         CLARA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT 
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY 
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU 
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE 
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

IF IN MANUFACTURED HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3186 8863 3146 8859 3143 8879 3183 8890
TIME...MOT...LOC 1900Z 171DEG 27KT 3154 8871

$$
1 follow-up statement
163 
WWUS54 KMOB 041957
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
257 PM CDT SUN SEP 4 2011

MSC153-042006-
/O.EXP.KMOB.TO.W.0115.000000T0000Z-110904T2000Z/
WAYNE MS-
257 PM CDT SUN SEP 4 2011

...THE TORNADO WARNING FOR CENTRAL WAYNE COUNTY WILL EXPIRE AT 300 PM
CDT...

THE SERIES OF STORMS THAT PROMPTED THE WARNING ARE EXHIBITING NO 
FURTHER ROTATION CAPABLE OF DEVELOPING TORNADOES.  FUTURE WARNINGS 
ARE POSSIBLE AS MORE STORMS DEVELOP FROM THE SOUTH...BUT AS OF RIGHT 
NOW...THIS WARNING WILL BE ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3186 8863 3146 8859 3143 8879 3183 8890
TIME...MOT...LOC 1956Z 171DEG 27KT 3196 8879

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 7:53 PM CDTAreal Flood WarningMOBGeorge, Greene, Perry, Stone6 hr
Sep 4, 12:59 AM CDTTornado WarningMOBGeorge61 min
Sep 4, 1:09 AM CDTFlash Flood WarningMOBStone3 hr
Sep 4, 3:10 AM CDTTornado WarningMOBGeorge50 min
Sep 4, 8:40 AM CDTTornado WarningMOBGreene, Perry35 min
Sep 4, 9:14 AM CDTTornado WarningMOBPerry, Wayne46 min
Sep 4, 9:54 AM CDTRiver Flood WarningMOBGeorge, Greene, Wayne25 hr
Sep 4, 11:13 AM CDTTornado WarningMOBPerry62 min
Sep 4, 11:19 AM CDTTornado WarningMOBGreene, Perry56 min
Sep 4, 11:41 AM CDTTornado WarningMOBGreene, Wayne64 min
Sep 4, 12:19 PM CDTTornado WarningMOBGreene56 min
Sep 4, 1:18 PM CDTTornado WarningMOBWayne42 min
Sep 4, 1:22 PM CDTFlash Flood WarningMOBWayne3 hr
Sep 4, 1:57 PM CDTFlash Flood WarningMOBGeorge, Greene3 hr

Nearby

Tornado Warnings in Mississippi, 2011Every tornado warning in 2011Tornadoes 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.