Alert archive / Mississippi / Tornado Warnings in 2012

Tornado Warning 30, NWS Jackson, MS

March 21, 2012Claiborne County, Jefferson County, Mississippi

NWS Jackson, MS issued this tornado warning at Mar 21, 2012, 10:29 AM CDT for Claiborne County, Jefferson County, Mississippi. It was in force for 40 min. 2 reports 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: Mar 21, 2012, 10:29 AM CDT (15:29 UTC)
Expired: Mar 21, 2012, 11:09 AM CDT
In force: 40 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Claiborne County, MS, Jefferson County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 108 km from the middle of the area, began a volume at 15:30 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
Mar 21, 10:30 AM CDT	TSTM WND DMG	4 Ne Alcorn, MS	TREES DOWN ACROSS RODNEY...RUSSUM/WESTSIDE...AND NATHAN JONES ROADS...POSSIBLE TORNADO BASED ON RADAR
Mar 21, 10:53 AM CDT	TSTM WND DMG	7 Ssw Yokena, MS	TREES DOWN ACROSS FLODY ROAD...POWERLINES DOWW IN AREA...PROBABLE TORNADO BASED ON RADAR

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 21, 5:04 AM CDT	Tornado Watch	SPC	7 hr
Mar 21, 10:07 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 3.5 hours before the alert went out and 101 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: 143 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 559 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 239 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

433 
WFUS54 KJAN 211529
TORJAN
MSC021-063-211630-
/O.NEW.KJAN.TO.W.0030.120321T1529Z-120321T1630Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1029 AM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN CLAIBORNE COUNTY IN SOUTHWEST MISSISSIPPI...
  NORTH CENTRAL JEFFERSON COUNTY IN SOUTHWEST MISSISSIPPI...

* UNTIL 1130 AM CDT

* AT 1029 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ALCORN
  MOVING NORTH AT 50 MPH.

* THE TORNADO WILL BE NEAR...
  PORT GIBSON BY 1035 AM CDT...
  PORT GIBSON BY 1040 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM CDT WEDNESDAY EVENING
FOR NORTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3191 9121 3192 9118 3197 9119 3201 9108
      3204 9109 3205 9116 3208 9115 3205 9108
      3208 9108 3211 9103 3209 9099 3211 9096
      3208 9093 3212 9088 3178 9104 3185 9123
TIME...MOT...LOC 1529Z 199DEG 45KT 3188 9110

$$

19

1 follow-up statement

894 
WWUS54 KJAN 211609
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1109 AM CDT WED MAR 21 2012

MSC021-063-211620-
/O.CAN.KJAN.TO.W.0030.000000T0000Z-120321T1630Z/
JEFFERSON MS-CLAIBORNE MS-
1109 AM CDT WED MAR 21 2012

...THE TORNADO WARNING FOR WESTERN CLAIBORNE AND NORTH CENTRAL
JEFFERSON COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE TORNADO WARNING HAS MOVED OUT OF THE
COUNTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM CDT WEDNESDAY EVENING
FOR NORTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 3191 9121 3192 9118 3197 9119 3201 9108
      3204 9109 3205 9116 3208 9115 3205 9108
      3208 9108 3211 9103 3209 9099 3211 9096
      3208 9093 3212 9088 3178 9104 3185 9123
TIME...MOT...LOC 1610Z 199DEG 45KT 3236 9090

$$

MME

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 21, 9:42 AM CDT	Severe Thunderstorm Warning	JAN	Adams	40 min
Mar 21, 10:10 AM CDT	Special Weather Statement	JAN	Jefferson	60 min
Mar 21, 10:18 AM CDT	Severe Thunderstorm Warning	JAN	Franklin, Jefferson	42 min
Mar 21, 10:20 AM CDT	Areal Flood Warning	JAN	Adams	3 hr
Mar 21, 10:24 AM CDT	Tornado Warning	JAN	Jefferson	27 min
Mar 21, 10:35 AM CDT	Severe Thunderstorm Warning	JAN	Franklin, Lincoln	55 min
Mar 21, 10:48 AM CDT	Severe Thunderstorm Warning	JAN	Warren	57 min
Mar 21, 10:55 AM CDT	Tornado Warning	JAN	Claiborne, Warren	33 min
Mar 21, 11:05 AM CDT	Special Weather Statement	JAN	Copiah	45 min
Mar 21, 11:17 AM CDT	Severe Thunderstorm Warning	JAN	Copiah	58 min
Mar 21, 11:25 AM CDT	Special Weather Statement	JAN	Hinds	60 min
Mar 21, 11:32 AM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey, Yazoo	58 min
Mar 21, 11:34 AM CDT	Special Weather Statement	JAN	Lawrence	31 min
Mar 21, 11:40 AM CDT	Special Weather Statement	JAN	Hinds	60 min
Mar 21, 11:44 AM CDT	Special Weather Statement	JAN	Lincoln	31 min
Mar 21, 12:05 PM CDT	Severe Thunderstorm Warning	JAN	Yazoo	55 min
Mar 21, 12:09 PM CDT	Severe Thunderstorm Warning	JAN	Lawrence	51 min
Mar 21, 12:14 PM CDT	Special Weather Statement	JAN	Forrest	61 min
Mar 21, 12:20 PM CDT	Special Weather Statement	JAN	Madison	60 min
Mar 21, 12:38 PM CDT	Severe Thunderstorm Warning	JAN	Marion	37 min
Mar 21, 12:42 PM CDT	Special Weather Statement	JAN	Rankin	58 min
Mar 21, 12:56 PM CDT	Special Weather Statement	JAN	Yazoo	29 min
Mar 21, 1:10 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Forrest, Jefferson Davis, Lamar, Marion	65 min
Mar 21, 1:18 PM CDT	Special Weather Statement	JAN	Hinds	52 min
Mar 21, 1:26 PM CDT	Special Weather Statement	JAN	Madison	49 min
Mar 21, 1:29 PM CDT	Special Weather Statement	JAN	Simpson, Smith	61 min
Mar 21, 1:55 PM CDT	Special Weather Statement	JAN	Rankin	50 min
Mar 21, 2:05 PM CDT	Tornado Warning	JAN	Rankin	21 min
Mar 21, 2:21 PM CDT	Special Weather Statement	JAN	Scott	59 min
Mar 21, 2:25 PM CDT	Tornado Warning	JAN	Scott	30 min
Mar 21, 2:37 PM CDT	Severe Thunderstorm Warning	JAN	Forrest, Lamar	53 min
Mar 21, 2:47 PM CDT	Tornado Warning	JAN	Forrest, Lamar	16 min
Mar 21, 3:03 PM CDT	River Flood Warning	JAN	Attala, Holmes	8 days
Mar 21, 3:22 PM CDT	Special Weather Statement	JAN	Neshoba, Winston	58 min
Mar 21, 3:28 PM CDT	Tornado Warning	JAN	Forrest, Jones, Lamar	44 min
Mar 21, 3:32 PM CDT	Severe Thunderstorm Warning	JAN	Kemper, Neshoba, Noxubee, Winston	58 min
Mar 21, 4:24 PM CDT	Special Weather Statement	JAN	Clay, Oktibbeha	61 min
Mar 21, 4:45 PM CDT	Special Weather Statement	JAN	Covington	45 min
Mar 21, 5:06 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Jones	39 min
Mar 21, 5:09 PM CDT	Tornado Warning	JAN	Jones	36 min
Mar 21, 5:22 PM CDT	Flash Flood Warning	JAN	Hinds, Madison, Rankin	113 min
Mar 21, 5:34 PM CDT	Tornado Warning	JAN	Jasper	44 min
Mar 21, 6:34 PM CDT	Flash Flood Warning	JAN	Forrest, Lamar	116 min

Nearby

Tornado Warnings in Mississippi, 2012 Every tornado warning in 2012 Tornadoes 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.