Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 13, NWS Jackson, MS

February 21, 2018Madison Parish, Louisiana; Warren County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Feb 21, 2018, 2:53 PM CST for Madison Parish, Louisiana; Warren County, Mississippi. It was in force for 36 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: Feb 21, 2018, 2:53 PM CST (20:53 UTC)
Expired: Feb 21, 2018, 3:29 PM CST
In force: 36 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Madison Parish, LA, Warren County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 100 km from the middle of the area, began a volume at 20:52 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
Feb 21, 9:48 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.9 hours before the alert went out and 91 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: 363 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

240 
WUUS54 KJAN 212053 RRA
SVRJAN
LAC065-MSC149-212145-
/O.NEW.KJAN.SV.W.0013.180221T2053Z-180221T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
253 PM CST WED FEB 21 2018

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Southeastern Madison Parish in northeastern Louisiana...
  Southwestern Warren County in west central Mississippi...

* Until 345 PM CST

* At 252 PM CST, a severe thunderstorm was located 7 miles east of
  Somerset, or 18 miles south of Tallulah, moving northeast at 45
  mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* This severe thunderstorm will be near...
  Le Tourneau and Yokena around 305 PM CST. 
  Vicksburg around 310 PM CST. 
  Bovina around 325 PM CST. 

Other locations impacted by this severe thunderstorm include Mound
and Delta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 500 PM CST for northeastern
Louisiana.

LAT...LON 3248 9100 3247 9096 3242 9096 3244 9095
      3245 9093 3236 9071 3210 9100 3213 9107
      3212 9112 3214 9117 3217 9117 3220 9116
      3221 9113 3221 9112 3224 9112 3225 9113
      3225 9118
TIME...MOT...LOC 2052Z 224DEG 38KT 3215 9111 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$
BYB

3 follow-up statements

648 
WWUS54 KJAN 212108
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
308 PM CST WED FEB 21 2018

LAC065-MSC149-212145-
/O.CON.KJAN.SV.W.0013.000000T0000Z-180221T2145Z/
Madison LA-Warren MS-
308 PM CST WED FEB 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CST
FOR SOUTHEASTERN MADISON PARISH IN NORTHEASTERN LOUISIANA AND CENTRAL
WARREN COUNTIES...

At 308 PM CST, a severe thunderstorm was located near Le Tourneau, or
7 miles southwest of Vicksburg, moving northeast at 45 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

This severe storm will be near...
  Vicksburg around 315 PM CST. 
  Bovina around 325 PM CST. 

Other locations impacted by this severe thunderstorm include Mound
and Delta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 500 PM CST for northeastern
Louisiana.

LAT...LON 3216 9102 3228 9110 3242 9096 3243 9096
      3245 9094 3245 9093 3236 9071 3235 9072
TIME...MOT...LOC 2108Z 224DEG 38KT 3227 9097 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

BYB

235 
WWUS54 KJAN 212120
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
320 PM CST WED FEB 21 2018

LAC065-212129-
/O.CAN.KJAN.SV.W.0013.000000T0000Z-180221T2145Z/
Madison LA-
320 PM CST WED FEB 21 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MADISON PARISH IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 500 PM CST for northeastern
Louisiana.

LAT...LON 3243 9089 3236 9071 3227 9085 3227 9086
      3232 9090 3233 9090 3236 9088 3238 9088
      3237 9089 3235 9090 3234 9091 3235 9097
TIME...MOT...LOC 2119Z 228DEG 37KT 3235 9086 

$$

MSC149-212145-
/O.CON.KJAN.SV.W.0013.000000T0000Z-180221T2145Z/
Warren MS-
320 PM CST WED FEB 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CST
FOR CENTRAL WARREN COUNTY...

At 319 PM CST, a severe thunderstorm was located over Vicksburg,
moving northeast at 45 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

This severe storm will be near...
  Bovina around 325 PM CST. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 500 PM CST for northeastern
Louisiana.

LAT...LON 3243 9089 3236 9071 3227 9085 3227 9086
      3232 9090 3233 9090 3236 9088 3238 9088
      3237 9089 3235 9090 3234 9091 3235 9097
TIME...MOT...LOC 2119Z 228DEG 37KT 3235 9086 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

BYB

854 
WWUS54 KJAN 212129
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
329 PM CST WED FEB 21 2018

MSC149-212139-
/O.CAN.KJAN.SV.W.0013.000000T0000Z-180221T2145Z/
Warren MS-
329 PM CST WED FEB 21 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WARREN COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 500 PM CST for northeastern
Louisiana.

LAT...LON 3243 9089 3236 9071 3227 9085 3227 9086
      3232 9090 3233 9090 3236 9088 3238 9088
      3237 9089 3235 9090 3234 9091 3235 9097
TIME...MOT...LOC 2127Z 224DEG 38KT 3243 9077 

$$

BYB

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 21, 12:48 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia, Franklin, Richland	42 min
Feb 21, 1:00 PM CST	River Flood Warning	JAN	East Carroll	32 days
Feb 21, 1:00 PM CST	River Flood Warning	JAN	Madison, Tensas	35 days
Feb 21, 1:00 PM CST	River Flood Warning	JAN	Concordia	79 days
Feb 21, 1:28 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Franklin, Tensas	62 min
Feb 21, 1:52 PM CST	Flash Flood Warning	JAN	Catahoula, Franklin, Tensas	3 hr
Feb 21, 2:28 PM CST	Severe Thunderstorm Warning	JAN	Franklin, Tensas	32 min
Feb 21, 2:39 PM CST	Special Weather Statement	JAN	Madison	51 min
Feb 21, 1:00 PM CST	River Flood Warning	JAN	Bolivar, Washington	31 days
Feb 21, 2:37 PM CST	Special Weather Statement	JAN	Franklin, Jefferson	23 min
Feb 21, 2:53 PM CST	Severe Thunderstorm Warning	JAN	Claiborne, Copiah, Franklin, Jefferson, Lincoln	52 min
Feb 21, 3:25 PM CST	Special Weather Statement	JAN	Copiah	50 min
Feb 21, 3:32 PM CST	Special Weather Statement	JAN	Yazoo	43 min
Feb 21, 3:36 PM CST	Severe Thunderstorm Warning	JAN	Copiah, Hinds	27 min
Feb 21, 4:12 PM CST	Special Weather Statement	JAN	Yazoo	33 min
Feb 21, 4:25 PM CST	Special Weather Statement	JAN	Hinds	35 min
Feb 21, 4:27 PM CST	Special Weather Statement	JAN	Copiah	33 min
Feb 21, 4:38 PM CST	Severe Thunderstorm Warning	JAN	Hinds, Madison	28 min
Feb 21, 4:47 PM CST	Special Weather Statement	JAN	Holmes	28 min
Feb 21, 4:54 PM CST	Special Weather Statement	JAN	Hinds	36 min
Feb 21, 5:10 PM CST	Flash Flood Warning	JAN	Hinds, Rankin	3 hr
Feb 21, 5:13 PM CST	Special Weather Statement	JAN	Attala	47 min
Feb 21, 5:18 PM CST	Special Weather Statement	JAN	Lawrence	27 min
Feb 21, 5:32 PM CST	Special Weather Statement	JAN	Rankin	28 min
Feb 21, 5:36 PM CST	Flash Flood Warning	JAN	Madison	3 hr
Feb 21, 5:39 PM CST	Special Weather Statement	JAN	Simpson	51 min
Feb 21, 5:49 PM CST	Severe Thunderstorm Warning	JAN	Copiah, Rankin, Simpson	25 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2018 Severe Thunderstorm Warnings in Mississippi, 2018 Every severe thunderstorm warning in 2018

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.