Alert archive / Arkansas / Tornado Warnings in 2018

Tornado Warning 8, NWS Shreveport, LA

January 21, 2018Hempstead County, Howard County, Sevier County, Arkansas

NWS Shreveport, LA issued this tornado warning at Jan 21, 2018, 10:31 PM CST for Hempstead County, Howard 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, 10:31 PM CST (04:31 UTC)
Expired: Jan 21, 2018, 11:06 PM CST
In force: 35 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Hempstead County, AR, Howard County, AR, Sevier County, AR

The radar

The Western Arkansas radar (KSRX), 134 km from the middle of the area, began a volume at 04:32 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, 4.5 hours before the alert went out and 185 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.

086 
WFUS54 KSHV 220431
TORSHV
ARC057-061-133-220515-
/O.NEW.KSHV.TO.W.0008.180122T0431Z-180122T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
1031 PM CST SUN JAN 21 2018

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Northwestern Hempstead County in southwestern Arkansas...
  Northeastern Sevier County in southwestern Arkansas...
  Northeastern Howard County in southwestern Arkansas...

* Until 1115 PM CST
    
* At 1031 PM CST, a severe thunderstorm capable of producing a
  tornado was located near Center Point, or 8 miles northwest of
  Mineral Springs, moving northeast at 45 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...
  Dierks, Corinth, Center Point, Muddy Fork and Provo. 

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 3427 9394 3426 9392 3419 9392 3418 9382
      3401 9382 3401 9381 3389 9394 3405 9414
      3429 9394
TIME...MOT...LOC 0431Z 224DEG 41KT 3398 9400 

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

$$

06

2 follow-up statements

733 
WWUS54 KSHV 220450
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1050 PM CST SUN JAN 21 2018

ARC057-133-220459-
/O.CAN.KSHV.TO.W.0008.000000T0000Z-180122T0515Z/
Hempstead AR-Sevier AR-
1050 PM CST SUN JAN 21 2018

...THE TORNADO WARNING FOR NORTHWESTERN HEMPSTEAD AND NORTHEASTERN
SEVIER COUNTIES 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 3402 9382 3401 9388 3399 9395 3401 9404
      3406 9406 3418 9393 3419 9392 3418 9382
TIME...MOT...LOC 0449Z 224DEG 41KT 3413 9383 

$$

ARC061-220515-
/O.CON.KSHV.TO.W.0008.000000T0000Z-180122T0515Z/
Howard AR-
1050 PM CST SUN JAN 21 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 PM CST FOR EAST
CENTRAL HOWARD COUNTY...
    
At 1049 PM CST, a severe thunderstorm capable of producing a tornado
was located near Corinth, or 11 miles east of Dierks, moving
northeast at 45 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...
Corinth, Center Point and Muddy Fork. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 3402 9382 3401 9388 3399 9395 3401 9404
      3406 9406 3418 9393 3419 9392 3418 9382
TIME...MOT...LOC 0449Z 224DEG 41KT 3413 9383 

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

$$

06

320 
WWUS54 KSHV 220506
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1106 PM CST SUN JAN 21 2018

ARC061-220513-
/O.CAN.KSHV.TO.W.0008.000000T0000Z-180122T0515Z/
Howard AR-
1106 PM CST SUN JAN 21 2018

...THE TORNADO WARNING FOR EAST CENTRAL HOWARD 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 400 AM CST for southwestern
Arkansas.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Southwestern Little River and Southeastern Sevier County until 
1145 PM CST. 


LAT...LON 3402 9382 3401 9388 3399 9395 3401 9404
      3406 9406 3418 9393 3419 9392 3418 9382
TIME...MOT...LOC 0502Z 224DEG 41KT 3425 9369 

$$

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, 10:11 PM CST	Tornado Warning	SHV	Howard, Little River, 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.