Alert archive / Arkansas / Tornado Warnings in 2017

Tornado Warning 7, NWS Shreveport, LA

January 21, 2017Lafayette County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Jan 21, 2017, 5:41 PM CST for Lafayette County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Louisiana. It was in force for 49 min. 1 report 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, 5:41 PM CST (23:41 UTC)
Expired: Jan 21, 2017, 6:30 PM CST
In force: 49 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Lafayette County, AR, Miller County, AR, Bossier Parish, LA, Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 70 km from the middle of the area, began a volume at 23:45 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, 6:30 PM CST	HAIL 1.5	4 Nw Taylor, AR	PHOTO OF LARGE HAIL IN THE WALKER CREEK COMMUNITY.

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 12:00Z, 11.7 hours before the alert went out and 66 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: 20 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1223 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

734 
WFUS54 KSHV 212341
TORSHV
ARC073-091-LAC015-017-220030-
/O.NEW.KSHV.TO.W.0007.170121T2341Z-170122T0030Z/

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

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southern Miller County in southwestern Arkansas...
  Southwestern Lafayette County in southwestern Arkansas...
  North central Caddo Parish in northwestern Louisiana...
  Northwestern Bossier Parish in northwestern Louisiana...

* Until 630 PM CST
    
* At 541 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Ida, or 19 miles west of Springhill, moving
  northeast at 40 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...
  Fouke, Bradley, Ida, Canfield, Canale, Pleasant Valley, Gin City,
  Fort Lynn and Kiblah.

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 3293 9375 3303 9404 3333 9387 3315 9349
TIME...MOT...LOC 2341Z 213DEG 33KT 3300 9381 

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

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 2:51 PM CST	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	34 hr
Jan 21, 4:44 PM CST	Tornado Warning	SHV	Miller	61 min
Jan 21, 4:49 PM CST	Severe Thunderstorm Warning	SHV	Lafayette	56 min
Jan 21, 4:56 PM CST	Tornado Warning	SHV	Lafayette	49 min
Jan 21, 5:30 PM CST	Tornado Warning	SHV	Columbia, Lafayette	60 min
Jan 21, 5:34 PM CST	Severe Thunderstorm Warning	SHV	Little River	56 min
Jan 21, 5:46 PM CST	Severe Thunderstorm Warning	SHV	Lafayette, Miller	44 min
Jan 21, 9:44 AM CST	River Flood Warning	SHV	Caldwell, Grant, LaSalle, Winn	4 days
Jan 21, 4:21 PM CST	Special Weather Statement	SHV	Caddo	54 min
Jan 21, 5:03 PM CST	Severe Thunderstorm Warning	SHV	Caddo	57 min
Jan 21, 5:33 PM CST	Tornado Warning	SHV	Bossier, Claiborne, Webster	42 min
Jan 21, 5:37 PM CST	Tornado Warning	SHV	Grant, Natchitoches, Winn	38 min

Nearby

Tornado Warnings in Arkansas, 2017 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.