Alert archive / Mississippi / Tornado Warnings in 2011

Tornado Warning 106, NWS Mobile, AL

September 4, 2011Perry County, Mississippi

NWS Mobile, AL issued this tornado warning at Sep 4, 2011, 11:13 AM CDT for Perry County, Mississippi. It was in force for 62 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, 11:13 AM CDT (16:13 UTC)
Expired: Sep 4, 2011, 12:15 PM CDT
In force: 62 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Perry County, MS

The radar

The Mobile radar (KMOB), 104 km from the middle of the area, began a volume at 16:16 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
Sep 4, 5:05 AM CDT	Tornado Watch	SPC	11 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.2 hours before the alert went out and 127 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: 2528 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 473 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 249 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 18.9

Open this sounding in Storm Lab

The text

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

835 
WFUS54 KMOB 041613
TORMOB
MSC111-041715-
/O.NEW.KMOB.TO.W.0106.110904T1613Z-110904T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1113 AM CDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN PERRY COUNTY IN SOUTHEAST MISSISSIPPI...

* UNTIL 1215 PM CDT

* AT 1112 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 15 MILES
  SOUTHWEST OF RICHTON...OR 4 MILES SOUTHWEST OF NEW AUGUSTA...MOVING
  NORTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NEW AUGUSTA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MANUFACTURED HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL 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 3120 8915 3143 8915 3144 8914 3144 8903
      3143 8903 3110 8893 3104 8913 3110 8916
TIME...MOT...LOC 1613Z 161DEG 17KT 3116 8906

$$

1 follow-up statement

951 
WWUS54 KMOB 041713
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1213 PM CDT SUN SEP 4 2011

MSC111-041721-
/O.EXP.KMOB.TO.W.0106.000000T0000Z-110904T1715Z/
PERRY MS-
1213 PM CDT SUN SEP 4 2011

...THE TORNADO WARNING FOR NORTHWESTERN PERRY COUNTY WILL EXPIRE AT
1215 PM CDT...

THE THUNDERSTORMS INDICATING ROTATION ARE WEAKENING AND EXITING THE 
WARNED AREA. HOWEVER...IT SHOULD BE NOTED THAT NEW STORMS WILL 
LIKELY FORM AND REQUIRE NEW WARNINGS FOR THE REST OF THIS AFTERNOON.

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

LAT...LON 3120 8915 3143 8915 3144 8914 3144 8903
      3143 8903 3110 8893 3104 8913 3110 8916
TIME...MOT...LOC 1711Z 161DEG 17KT 3142 8916

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 7:53 PM CDT	Areal Flood Warning	MOB	George, Greene, Perry, Stone	6 hr
Sep 4, 12:59 AM CDT	Tornado Warning	MOB	George	61 min
Sep 4, 1:09 AM CDT	Flash Flood Warning	MOB	Stone	3 hr
Sep 4, 3:10 AM CDT	Tornado Warning	MOB	George	50 min
Sep 4, 8:40 AM CDT	Tornado Warning	MOB	Greene, Perry	35 min
Sep 4, 9:14 AM CDT	Tornado Warning	MOB	Perry, Wayne	46 min
Sep 4, 9:54 AM CDT	River Flood Warning	MOB	George, Greene, Wayne	25 hr
Sep 4, 11:19 AM CDT	Tornado Warning	MOB	Greene, Perry	56 min
Sep 4, 11:41 AM CDT	Tornado Warning	MOB	Greene, Wayne	64 min
Sep 4, 12:19 PM CDT	Tornado Warning	MOB	Greene	56 min
Sep 4, 1:18 PM CDT	Tornado Warning	MOB	Wayne	42 min
Sep 4, 1:22 PM CDT	Flash Flood Warning	MOB	Wayne	3 hr
Sep 4, 1:57 PM CDT	Flash Flood Warning	MOB	George, Greene	3 hr
Sep 4, 2:01 PM CDT	Tornado Warning	MOB	Wayne	59 min

Nearby

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