Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 21, NWS Shreveport, LA

January 21, 2017Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Jan 21, 2017, 7:56 PM CST for Grant Parish, LaSalle Parish, Louisiana. It was in force for 64 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: Jan 21, 2017, 7:56 PM CST (01:56 UTC)
Expired: Jan 21, 2017, 9:00 PM CST
In force: 64 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Grant Parish, LA, LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 89 km from the middle of the area, began a volume at 01:55 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
Jan 21, 8:29 PM CST	TORNADO	Jena, LA	AN EF1 TORNADO TOUCHED DOWN SNAPPING TREES WEST OF HWY 1304 NEAR HWY 8. A WOODEN BARN WAS DAMAGED AND A UPROOTED TREE FELL ON A CHURCH. A GAS STATION CANOPY WAS BLOWN 50 YARDS AWAY AND A BRICK FACADE FROM A LOCAL BUSINESS COLLAPSED FROM THE WALL OF THE BUILDIN
Jan 21, 8:30 PM CST	TSTM WND DMG	1 Sw Midway, LA	2 BUSINESSES, SEVERAL HOMES, AND 2 VEHICLES DAMAGED ALONG HIGHWAY 8, ENDING JUST BEFORE 3107.

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
Jan 21, 3:41 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 1.9 hours before the alert went out and 167 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: 1144 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 9.0

Open this sounding in Storm Lab

The text

As transmitted.

534 
WFUS54 KSHV 220156
TORSHV
LAC043-059-220300-
/O.NEW.KSHV.TO.W.0021.170122T0156Z-170122T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
756 PM CST SAT JAN 21 2017

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Northeastern Grant Parish in north central Louisiana...
  Central La Salle Parish in north central Louisiana...

* Until 900 PM CST
    
* At 756 PM CST, a severe thunderstorm capable of producing a tornado
  was located 12 miles west of Midway, or 22 miles north of
  Pineville, moving east at 20 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. 

* Locations impacted include...
  Jena, Midway, Georgetown, Zenoria and Nebo. 

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 3157 9229 3157 9238 3174 9243 3176 9239
      3189 9201 3159 9201
TIME...MOT...LOC 0156Z 249DEG 16KT 3166 9237 

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

$$

06

2 follow-up statements

088 
WWUS54 KSHV 220216
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
816 PM CST SAT JAN 21 2017

LAC043-220225-
/O.CAN.KSHV.TO.W.0021.000000T0000Z-170122T0300Z/
Grant LA-
816 PM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR NORTHEASTERN GRANT PARISH IS CANCELLED...
    
The tornadic 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 900 PM CST for north central
Louisiana.

LAT...LON 3158 9230 3171 9233 3187 9201 3159 9201
      3158 9215
TIME...MOT...LOC 0215Z 249DEG 16KT 3166 9223 

$$

LAC059-220300-
/O.CON.KSHV.TO.W.0021.000000T0000Z-170122T0300Z/
La Salle LA-
816 PM CST SAT JAN 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CST FOR CENTRAL
LA SALLE PARISH...
    
At 815 PM CST, a severe thunderstorm capable of producing a tornado
was located near Midway, or 25 miles northeast of Pineville, moving
east at 20 mph.

HAZARD...Tornado and quarter size hail. 

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. 

Locations impacted include...
Jena, Midway and Nebo. 

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 3158 9230 3171 9233 3187 9201 3159 9201
      3158 9215
TIME...MOT...LOC 0215Z 249DEG 16KT 3166 9223 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

06

200 
WWUS54 KSHV 220254
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
854 PM CST SAT JAN 21 2017

LAC059-220304-
/O.EXP.KSHV.TO.W.0021.000000T0000Z-170122T0300Z/
La Salle LA-
854 PM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR CENTRAL LA SALLE PARISH WILL EXPIRE AT 900
PM CST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A tornado watch remains in effect until midnight CST for north
central Louisiana.

LAT...LON 3158 9230 3171 9233 3187 9201 3159 9201
      3158 9215
TIME...MOT...LOC 0254Z 249DEG 16KT 3172 9206 

$$

06

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 21, 6:04 PM CST	Tornado Warning	SHV	Claiborne	41 min
Jan 21, 6:04 PM CST	Tornado Warning	SHV	Bossier, Caddo	56 min
Jan 21, 6:13 PM CST	Tornado Warning	SHV	Grant, Winn	47 min
Jan 21, 6:14 PM CST	Tornado Warning	SHV	Grant, Natchitoches	61 min
Jan 21, 6:16 PM CST	Severe Thunderstorm Warning	SHV	Claiborne, Webster	59 min
Jan 21, 6:22 PM CST	Special Weather Statement	SHV	Claiborne	38 min
Jan 21, 6:32 PM CST	Tornado Warning	SHV	Claiborne, Union	43 min
Jan 21, 6:44 PM CST	Tornado Warning	SHV	Claiborne	46 min
Jan 21, 6:48 PM CST	Tornado Warning	SHV	Bossier, Caddo, Webster	57 min
Jan 21, 6:52 PM CST	Severe Thunderstorm Warning	SHV	LaSalle	23 min
Jan 21, 7:00 PM CST	Tornado Warning	SHV	Grant, LaSalle, Winn	22 min
Jan 21, 7:08 PM CST	Tornado Warning	SHV	Grant	52 min
Jan 21, 7:13 PM CST	Tornado Warning	SHV	Union	47 min
Jan 21, 7:21 PM CST	Tornado Warning	SHV	Claiborne, Union	54 min
Jan 21, 7:34 PM CST	Severe Thunderstorm Warning	SHV	Union	56 min
Jan 21, 7:37 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Claiborne, Webster	68 min
Jan 21, 7:39 PM CST	Tornado Warning	SHV	Union	51 min
Jan 21, 8:03 PM CST	Tornado Warning	SHV	Claiborne, Webster	57 min
Jan 21, 8:21 PM CST	Tornado Warning	SHV	Union	39 min
Jan 21, 8:47 PM CST	Tornado Warning	SHV	Lincoln, Union	43 min
Jan 21, 8:48 PM CST	Special Weather Statement	SHV	Webster	42 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.