Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 21, NWS Jackson, MS

January 21, 2017Catahoula Parish, Concordia Parish, Louisiana

NWS Jackson, MS issued this tornado warning at Jan 21, 2017, 8:43 PM CST for Catahoula Parish, Concordia Parish, Louisiana. It was in force for 17 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: Jan 21, 2017, 8:43 PM CST (02:43 UTC)
Expired: Jan 21, 2017, 9:00 PM CST
In force: 17 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Catahoula Parish, LA, Concordia Parish, LA

The radar

The Ft Polk radar (KPOE), 142 km from the middle of the area, began a volume at 02:46 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
Jan 21, 3:29 PM CST	Tornado Watch	SPC	6 hr
Jan 21, 7:50 PM CST	Tornado Watch	SPC	4 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 2.7 hours before the alert went out and 163 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: 1036 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 1052 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

878 
WFUS54 KJAN 220243
TORJAN
LAC025-029-220345-
/O.NEW.KJAN.TO.W.0021.170122T0243Z-170122T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Jackson MS
843 PM CST SAT JAN 21 2017

The National Weather Service in Jackson has issued a

* Tornado Warning for...
  Northwestern Concordia Parish in northeastern Louisiana...
  Northern Catahoula Parish in northeastern Louisiana...

* Until 945 PM CST
    
* At 843 PM CST, a severe thunderstorm capable of producing a tornado
  was located over Manifest, or 23 miles north of Larto, moving east
  at 30 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Wallace Ridge around 905 PM CST. 
  Clayton and Lee Bayou around 935 PM CST. 

Other locations impacted by this tornadic thunderstorm include Sicily
Island and Harrisonburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3180 9200 3189 9179 3189 9178 3187 9178
      3188 9176 3188 9173 3194 9166 3197 9160
      3188 9160 3188 9158 3187 9158 3186 9157
      3180 9158 3175 9154 3165 9152 3159 9201
TIME...MOT...LOC 0243Z 253DEG 28KT 3170 9201 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

DB

1 follow-up statement

040 
WWUS54 KJAN 220300
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
900 PM CST SAT JAN 21 2017

LAC025-029-220310-
/O.CAN.KJAN.TO.W.0021.000000T0000Z-170122T0345Z/
Concordia LA-Catahoula LA-
900 PM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR NORTHWESTERN CONCORDIA AND NORTHERN
CATAHOULA PARISHES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 300 AM CST for northeastern
Louisiana.

LAT...LON 3180 9200 3189 9179 3189 9178 3187 9178
      3188 9176 3188 9173 3194 9166 3197 9160
      3188 9160 3188 9158 3187 9158 3186 9157
      3180 9158 3175 9154 3165 9152 3159 9201
TIME...MOT...LOC 0259Z 253DEG 28KT 3174 9186 

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 7:08 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	82 min
Jan 21, 7:24 PM CST	Tornado Warning	JAN	Catahoula, Concordia	66 min
Jan 21, 8:18 PM CST	Severe Thunderstorm Warning	JAN	Concordia, Tensas	57 min
Jan 21, 8:31 PM CST	Tornado Warning	JAN	Concordia	41 min
Jan 21, 8:46 PM CST	Tornado Warning	JAN	Morehouse, West Carroll	59 min
Jan 21, 9:38 PM CST	Severe Thunderstorm Warning	JAN	East Carroll, West Carroll	67 min
Jan 21, 9:43 PM CST	Severe Thunderstorm Warning	JAN	East Carroll, Morehouse, West Carroll	47 min
Jan 22, 5:18 AM CST	Wind Advisory	JAN	East Carroll, Morehouse, West Carroll	22 hr

Nearby

Tornado Warnings in Louisiana, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.