Alert archive / Arkansas / Tornado Warnings in 2018

Tornado Warning 7, NWS Shreveport, LA

January 21, 2018Howard County, Little River County, Sevier County, Arkansas

NWS Shreveport, LA issued this tornado warning at Jan 21, 2018, 10:11 PM CST for Howard County, Little River County, Sevier County, Arkansas. It was in force for 35 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, 2018, 10:11 PM CST (04:11 UTC)
Expired: Jan 21, 2018, 10:46 PM CST
In force: 35 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Howard County, AR, Little River County, AR, Sevier County, AR

The radar

The Western Arkansas radar (KSRX), 159 km from the middle of the area, began a volume at 04:12 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, 3:05 PM CST	Tornado Watch	SPC	8 hr
Jan 21, 9:59 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 4.2 hours before the alert went out and 158 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: 39 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 970 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

841 
WFUS54 KSHV 220411
TORSHV
ARC061-081-133-220500-
/O.NEW.KSHV.TO.W.0007.180122T0411Z-180122T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
1011 PM CST SUN JAN 21 2018

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Central Little River County in southwestern Arkansas...
  Southeastern Sevier County in southwestern Arkansas...
  Southeastern Howard County in southwestern Arkansas...

* Until 1100 PM CST
    
* At 1011 PM CST, a severe thunderstorm capable of producing a
  tornado was located near Winthrop, or 9 miles northeast of Foreman,
  moving northeast at 50 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...
  Lockesburg, Ben Lomond, Oak Grove, Silver Ridge, Central, Provo,
  Browntown and Bellview.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3375 9414 3383 9433 3409 9411 3393 9388
TIME...MOT...LOC 0411Z 226DEG 42KT 3379 9425 

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

$$

06

2 follow-up statements

163 
WWUS54 KSHV 220424
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1024 PM CST SUN JAN 21 2018

ARC081-220433-
/O.CAN.KSHV.TO.W.0007.000000T0000Z-180122T0500Z/
Little River AR-
1024 PM CST SUN JAN 21 2018

...THE TORNADO WARNING FOR CENTRAL LITTLE RIVER COUNTY 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 400 AM CST for southwestern
Arkansas.

LAT...LON 3379 9409 3383 9420 3390 9427 3409 9411
      3393 9388
TIME...MOT...LOC 0423Z 229DEG 45KT 3392 9409 

$$

ARC061-133-220500-
/O.CON.KSHV.TO.W.0007.000000T0000Z-180122T0500Z/
Sevier AR-Howard AR-
1024 PM CST SUN JAN 21 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM CST FOR
SOUTHEASTERN SEVIER AND SOUTHEASTERN HOWARD COUNTIES...
    
At 1023 PM CST, a severe thunderstorm capable of producing a tornado
was located near Ben Lomond, or 10 miles west of Mineral Springs,
moving northeast at 50 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...
Lockesburg, Ben Lomond, Oak Grove, Silver Ridge, Central, Provo,
Browntown and Bellview.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3379 9409 3383 9420 3390 9427 3409 9411
      3393 9388
TIME...MOT...LOC 0423Z 229DEG 45KT 3392 9409 

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

$$

06

859 
WWUS54 KSHV 220446
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1046 PM CST SUN JAN 21 2018

ARC061-133-220453-
/O.CAN.KSHV.TO.W.0007.000000T0000Z-180122T0500Z/
Sevier AR-Howard AR-
1046 PM CST SUN JAN 21 2018

...THE TORNADO WARNING FOR SOUTHEASTERN SEVIER AND SOUTHEASTERN
HOWARD COUNTIES 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 400 AM CST for southwestern
Arkansas.

Remember, a Tornado Warning still remains in effect for Howard 
county in Arkansas until 1115 PM CST with the main circulation to 
the Southeast of Dierks and moving to the Northeast 45 MPH.

LAT...LON 3379 9409 3383 9420 3390 9427 3409 9411
      3393 9388
TIME...MOT...LOC 0441Z 226DEG 42KT 3408 9389 

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 8:41 PM CST	Severe Thunderstorm Warning	SHV	Sevier	49 min
Jan 21, 9:44 PM CST	Tornado Warning	SHV	Little River, Sevier	46 min
Jan 21, 10:31 PM CST	Tornado Warning	SHV	Hempstead, Howard, Sevier	35 min
Jan 21, 11:00 PM CST	Severe Thunderstorm Warning	SHV	Little River, Sevier	45 min
Jan 22, 3:25 AM CST	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	15 hr

Nearby

Tornado Warnings in Arkansas, 2018 Every tornado warning in 2018 Tornadoes 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.