Alert archive / Mississippi / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 366, NWS Memphis, TN

August 13, 2012Coahoma County, Mississippi; Phillips County, Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Aug 13, 2012, 5:00 PM CDT for Coahoma County, Mississippi; Phillips County, Arkansas. It was in force for 45 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: Aug 13, 2012, 5:00 PM CDT (22:00 UTC)
Expired: Aug 13, 2012, 5:45 PM CDT
In force: 45 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Phillips County, AR, Coahoma County, MS

The radar

The Little Rock radar (KLZK), 134 km from the middle of the area, began a volume at 22:03 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
Aug 13, 3:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 10.0 hours before the alert went out and 123 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: 1586 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

878 
WUUS54 KMEG 132200
SVRMEG
ARC107-MSC027-132245-
/O.NEW.KMEG.SV.W.0366.120813T2200Z-120813T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
500 PM CDT MON AUG 13 2012

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN PHILLIPS COUNTY IN EASTERN ARKANSAS...
  WEST CENTRAL COAHOMA COUNTY IN NORTHWEST MISSISSIPPI...

* UNTIL 545 PM CDT

* AT 500 PM CDT...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 8 MILES WEST OF
  WHITE RIVER NATIONAL WILDLIFE REFUGE...AND MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WHITE RIVER
  NATIONAL WILDLIFE REFUGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

.IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

.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 3415 9109 3419 9110 3422 9107 3425 9108
      3427 9107 3421 9082 3412 9085 3412 9112
      3413 9112
TIME...MOT...LOC 2200Z 284DEG 19KT 3421 9120

$$

2 follow-up statements

732 
WWUS54 KMEG 132230
SVSMEG

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
530 PM CDT MON AUG 13 2012

ARC107-MSC027-132245-
/O.CON.KMEG.SV.W.0366.000000T0000Z-120813T2245Z/
PHILLIPS AR-COAHOMA MS-
530 PM CDT MON AUG 13 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR WEST CENTRAL COAHOMA AND SOUTHWESTERN PHILLIPS COUNTIES...

AT 531 PM CDT...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
WHITE RIVER NATIONAL WILDLIFE REFUGE...MOVING SOUTHEAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LUNDELL...
MOSBY SPUR...FERGUSON AND WHITE RIVER NATIONAL WILDLIFE REFUGE.

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.

.A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT FOR THE ALERT
AREA.

&&

LAT...LON 3415 9109 3419 9110 3422 9107 3423 9107
      3417 9083 3412 9085 3412 9112 3413 9112
TIME...MOT...LOC 2231Z 307DEG 21KT 3411 9105

$$

832 
WWUS54 KMEG 132244
SVSMEG

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
544 PM CDT MON AUG 13 2012

ARC107-MSC027-132254-
/O.EXP.KMEG.SV.W.0366.000000T0000Z-120813T2245Z/
PHILLIPS AR-COAHOMA MS-
544 PM CDT MON AUG 13 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL COAHOMA AND
SOUTHWESTERN PHILLIPS COUNTIES WILL EXPIRE AT 545 PM CDT...

AT 544 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO
EXPIRE.

LAT...LON 3415 9109 3419 9110 3422 9107 3423 9107
      3417 9083 3412 9085 3412 9112 3413 9112
TIME...MOT...LOC 2244Z 307DEG 21KT 3406 9098

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 7:37 AM CDT	Severe Thunderstorm Warning	MEG	Coahoma	38 min
Aug 13, 8:12 AM CDT	Severe Thunderstorm Warning	MEG	Coahoma, Panola, Quitman, Tallahatchie, Yalobusha	48 min
Aug 13, 8:59 AM CDT	Special Weather Statement	MEG	Yalobusha	46 min
Aug 13, 9:24 AM CDT	Special Weather Statement	MEG	Calhoun	51 min
Aug 13, 10:02 AM CDT	Special Weather Statement	MEG	Chickasaw, Lee, Monroe	43 min
Aug 13, 10:10 AM CDT	Special Weather Statement	MEG	Alcorn	50 min
Aug 13, 10:29 AM CDT	Special Weather Statement	MEG	Monroe	46 min
Aug 13, 10:34 AM CDT	Special Weather Statement	MEG	Alcorn	26 min
Aug 13, 4:20 PM CDT	Severe Thunderstorm Warning	MEG	Coahoma	40 min
Aug 13, 4:26 PM CDT	Special Weather Statement	MEG	Tishomingo	34 min
Aug 13, 4:52 PM CDT	Severe Thunderstorm Warning	MEG	Tallahatchie	38 min
Aug 13, 5:15 PM CDT	Severe Thunderstorm Warning	MEG	Benton	45 min
Aug 13, 5:26 PM CDT	Severe Thunderstorm Warning	MEG	Panola, Tallahatchie, Yalobusha	49 min
Aug 13, 5:29 PM CDT	Severe Thunderstorm Warning	MEG	Tallahatchie	46 min
Aug 13, 6:23 PM CDT	Special Weather Statement	MEG	Tallahatchie	37 min
Aug 13, 6:50 PM CDT	Special Weather Statement	MEG	Marshall	25 min
Aug 13, 6:56 PM CDT	Special Weather Statement	MEG	Tallahatchie	34 min
Aug 13, 6:57 PM CDT	Special Weather Statement	MEG	Panola	33 min
Aug 13, 5:40 AM CDT	Special Weather Statement	MEG	Clay	35 min
Aug 13, 6:15 AM CDT	Severe Thunderstorm Warning	MEG	Clay	45 min
Aug 13, 3:43 PM CDT	Special Weather Statement	MEG	Poinsett	32 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2012 Severe Thunderstorm Warnings in Arkansas, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.