Alert archive / Mississippi / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 4, NWS Memphis, TN

January 17, 20124 counties in Mississippi

NWS Memphis, TN issued this severe thunderstorm warning at Jan 17, 2012, 11:40 AM CST for 4 counties in Mississippi. It was in force for 50 min. 1 report 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: Jan 17, 2012, 11:40 AM CST (17:40 UTC)
Expired: Jan 17, 2012, 12:30 PM CST
In force: 50 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Alcorn County, MS, Benton County, MS, Prentiss County, MS, Tippah County, MS

The radar

The Columbus AFB radar (KGWX), 102 km from the middle of the area, began a volume at 17:40 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
Jan 17, 12:00 PM CST	TORNADO	3 Ne Dumas, MS	TORNADO SIGHTED IN THE DUMAS PINE GROVE AREA NEAR HIGHWAY 4.

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

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 5.7 hours before the alert went out and 103 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: 1319 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 372 m²/s²
Significant tornado parameter: 3.2
Supercell composite: 12.9

Open this sounding in Storm Lab

The text

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

065 
WUUS54 KMEG 171740
SVRMEG
MSC003-009-117-139-171830-
/O.NEW.KMEG.SV.W.0004.120117T1740Z-120117T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
1140 AM CST TUE JAN 17 2012

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL ALCORN COUNTY IN NORTHEAST MISSISSIPPI...
  SOUTH CENTRAL BENTON COUNTY IN NORTHEAST MISSISSIPPI...
  NORTHWESTERN PRENTISS COUNTY IN NORTHEAST MISSISSIPPI...
  SOUTHERN TIPPAH COUNTY IN NORTHEAST MISSISSIPPI...

* UNTIL 1230 PM CST

* AT 1140 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES WEST OF
  BLUE MOUNTAIN...OR 11 MILES SOUTHWEST OF RIPLEY...AND MOVING EAST
  AT 45 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BLUE
  MOUNTAIN...JUMPERTOWN AND RIPLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

.STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 4 3 2 0 8 7 5.

&&

LAT...LON 3482 8860 3460 8860 3460 8920 3473 8918
TIME...MOT...LOC 1740Z 263DEG 40KT 3466 8910

$$

BORGHOFF

2 follow-up statements

178 
WWUS54 KMEG 171749
SVSMEG

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
1149 AM CST TUE JAN 17 2012

MSC009-171800-
/O.CAN.KMEG.SV.W.0004.000000T0000Z-120117T1830Z/
BENTON MS-
1149 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BENTON COUNTY IS
CANCELLED...

AT 1150 AM CST...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA 
AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. 
THEREFORE...THE SEVERE THUNDERSTORM WARNING IS CANCELLED.

LAT...LON 3482 8860 3460 8860 3461 8907 3473 8908
TIME...MOT...LOC 1750Z 265DEG 48KT 3467 8893

$$

MSC003-117-139-171830-
/O.CON.KMEG.SV.W.0004.000000T0000Z-120117T1830Z/
TIPPAH MS-PRENTISS MS-ALCORN MS-
1149 AM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CST
FOR SOUTH CENTRAL ALCORN...NORTHWESTERN PRENTISS AND SOUTHERN TIPPAH
COUNTIES...

AT 1150 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BLUE
MOUNTAIN...OR NEAR RIPLEY...MOVING EAST AT 55 MPH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BLUE
MOUNTAIN...DUMAS...JUMPERTOWN...RIPLEY...CLARYSVILLE AND BLACKLAND.

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 3482 8860 3460 8860 3461 8907 3473 8908
TIME...MOT...LOC 1750Z 265DEG 48KT 3467 8893

$$

BORGHOFF

268 
WWUS54 KMEG 171816
SVSMEG

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
1216 PM CST TUE JAN 17 2012

MSC003-139-171826-
/O.CAN.KMEG.SV.W.0004.000000T0000Z-120117T1830Z/
TIPPAH MS-ALCORN MS-
1216 PM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ALCORN AND
SOUTHERN TIPPAH COUNTIES IS CANCELLED...

AT 1216 PM CST...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA 
AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. 
THEREFORE...THE SEVERE THUNDERSTORM WARNING IS CANCELLED.

LAT...LON 3461 8871 3476 8871 3476 8860 3460 8860
TIME...MOT...LOC 1816Z 263DEG 42KT 3471 8858

$$

MSC117-171830-
/O.CON.KMEG.SV.W.0004.000000T0000Z-120117T1830Z/
PRENTISS MS-
1216 PM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CST
FOR NORTHWESTERN PRENTISS COUNTY...

AT 1216 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
JUMPERTOWN...OR NEAR BOONEVILLE...MOVING EAST AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BLACKLAND.

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 3461 8871 3476 8871 3476 8860 3460 8860
TIME...MOT...LOC 1816Z 263DEG 42KT 3471 8858

$$

BORGHOFF

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 16, 11:34 PM CST	Wind Advisory	MEG	Coahoma, DeSoto, Panola, Quitman, Tallahatchie, Tate and 1 more	12 hr
Jan 17, 11:28 AM CST	Special Weather Statement	MEG	Alcorn, Tippah	32 min
Jan 17, 11:53 AM CST	Tornado Warning	MEG	Prentiss, Tippah	37 min
Jan 17, 12:18 PM CST	Severe Thunderstorm Warning	MEG	Alcorn, Prentiss, Tishomingo	18 min
Jan 17, 12:28 PM CST	Severe Thunderstorm Warning	MEG	DeSoto, Marshall	20 min
Jan 17, 1:03 PM CST	Special Weather Statement	MEG	Lafayette	27 min
Jan 17, 1:42 PM CST	Severe Thunderstorm Warning	MEG	Alcorn, Tishomingo	24 min
Jan 17, 4:48 PM CST	Special Weather Statement	MEG	Itawamba	42 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2012 Every severe thunderstorm warning in 2012

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.