Alert archive / Mississippi / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 620, NWS Jackson, MS

December 20, 2012Lamar County, Marion County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Dec 20, 2012, 6:18 AM CST for Lamar County, Marion County, Mississippi. It was in force for 42 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: Dec 20, 2012, 6:18 AM CST (12:18 UTC)
Expired: Dec 20, 2012, 7:00 AM CST
In force: 42 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Lamar County, MS, Marion County, MS

The watch it was issued in

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

Issued	Product	Office	Lasted
Dec 20, 4:23 AM CST	Tornado Watch	SPC	9 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.3 hours before the alert went out and 89 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: 1181 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 275 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

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

659 
WUUS54 KJAN 201218
SVRJAN
MSC073-091-201300-
/O.NEW.KJAN.SV.W.0620.121220T1218Z-121220T1300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
618 AM CST THU DEC 20 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MARION COUNTY IN SOUTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF SANDY HOOK...
  SOUTHERN LAMAR COUNTY IN SOUTHEAST MISSISSIPPI...

* UNTIL 700 AM CST

* AT 618 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR SANDY HOOK MOVING NORTHEAST
  AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PINEBUR BY 625 AM CST...
  BAXTERVILLE BY 630 AM CST...
  LUMBERTON BY 635 AM CST...
  PURVIS BY 645 AM CST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WINDS OF 60 MPH CAN BRING DOWN TREES...POSSIBLY RESULTING IN INJURY
AND PROPERTY DAMAGE. ROOFS OF MOBILE HOMES AND OUTBUILDINGS COULD BE
DAMAGED...AND MINOR ROOF DAMAGE TO WELL BUILT HOMES AND STRUCTURES
COULD OCCUR.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST THURSDAY FOR EASTERN
MISSISSIPPI.

&&

LAT...LON 3101 8951 3100 8955 3099 8975 3101 8984
      3106 8984 3107 8987 3115 8991 3128 8935
      3100 8935 3100 8941 3099 8942 3098 8948
TIME...MOT...LOC 1218Z 240DEG 42KT 3105 8976

$$

AEG

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 20, 2:14 AM CST	Special Weather Statement	JAN	Kemper	31 min
Dec 20, 2:59 AM CST	Severe Thunderstorm Warning	JAN	Bolivar, Washington	76 min
Dec 20, 3:23 AM CST	Special Weather Statement	JAN	Madison	32 min
Dec 20, 3:42 AM CST	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey, Warren	78 min
Dec 20, 3:45 AM CST	Severe Thunderstorm Warning	JAN	Humphreys, Leflore, Sunflower	45 min
Dec 20, 3:59 AM CST	Tornado Warning	JAN	Madison	26 min
Dec 20, 4:18 AM CST	Severe Thunderstorm Warning	JAN	Holmes, Yazoo	72 min
Dec 20, 4:22 AM CST	Tornado Warning	JAN	Attala, Leake	34 min
Dec 20, 4:25 AM CST	Severe Thunderstorm Warning	JAN	Carroll, Grenada, Leflore, Montgomery	80 min
Dec 20, 4:34 AM CST	Severe Thunderstorm Warning	JAN	Adams, Claiborne, Franklin, Jefferson	71 min
Dec 20, 4:48 AM CST	Severe Thunderstorm Warning	JAN	Hinds, Madison	57 min
Dec 20, 4:56 AM CST	Special Weather Statement	JAN	Simpson	29 min
Dec 20, 5:01 AM CST	Severe Thunderstorm Warning	JAN	Copiah	59 min
Dec 20, 5:08 AM CST	Severe Thunderstorm Warning	JAN	Attala, Choctaw, Webster	67 min
Dec 20, 5:16 AM CST	Severe Thunderstorm Warning	JAN	Leake, Rankin, Scott	74 min
Dec 20, 5:24 AM CST	Severe Thunderstorm Warning	JAN	Lincoln	66 min
Dec 20, 5:26 AM CST	Severe Thunderstorm Warning	JAN	Jasper, Smith	34 min
Dec 20, 5:27 AM CST	Severe Thunderstorm Warning	JAN	Marion	48 min
Dec 20, 5:38 AM CST	Tornado Warning	JAN	Marion	37 min
Dec 20, 5:44 AM CST	Severe Thunderstorm Warning	JAN	Jefferson Davis, Lawrence, Simpson	76 min
Dec 20, 5:53 AM CST	Severe Thunderstorm Warning	JAN	Clay, Oktibbeha, Winston	52 min
Dec 20, 5:56 AM CST	Special Weather Statement	JAN	Kemper, Noxubee	29 min
Dec 20, 5:58 AM CST	Severe Thunderstorm Warning	JAN	Neshoba, Newton	62 min
Dec 20, 5:59 AM CST	Severe Thunderstorm Warning	JAN	Covington, Lamar	46 min
Dec 20, 6:00 AM CST	Severe Thunderstorm Warning	JAN	Jasper, Smith	75 min
Dec 20, 6:17 AM CST	Severe Thunderstorm Warning	JAN	Lauderdale	43 min
Dec 20, 6:20 AM CST	Severe Thunderstorm Warning	JAN	Lowndes, Noxubee	40 min
Dec 20, 6:23 AM CST	Severe Thunderstorm Warning	JAN	Covington, Jones	82 min
Dec 20, 6:33 AM CST	Severe Thunderstorm Warning	JAN	Kemper, Lauderdale	57 min
Dec 20, 6:38 AM CST	Severe Thunderstorm Warning	JAN	Forrest	37 min
Dec 20, 6:48 AM CST	Severe Thunderstorm Warning	JAN	Lamar, Marion	57 min
Dec 20, 6:51 AM CST	Severe Thunderstorm Warning	JAN	Clarke, Lauderdale	54 min
Dec 20, 6:59 AM CST	Severe Thunderstorm Warning	JAN	Lowndes, Noxubee	19 min
Dec 20, 7:12 AM CST	Severe Thunderstorm Warning	JAN	Forrest	48 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; the sounding from the Mesonet's radiosonde archive.