Alert archive / Arkansas / Tornado Warnings in 2018

Tornado Warning 86, NWS Shreveport, LA

June 20, 2018Columbia County, Lafayette County, Arkansas

NWS Shreveport, LA issued this tornado warning at Jun 20, 2018, 6:30 PM CDT for Columbia County, Lafayette County, Arkansas. It was in force for 30 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: Jun 20, 2018, 6:30 PM CDT (23:30 UTC)
Expired: Jun 20, 2018, 7:00 PM CDT
In force: 30 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Columbia County, AR, Lafayette County, AR

The radar

The Shreveport radar (KSHV), 84 km from the middle of the area, began a volume at 23:33 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 nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.5 hours before the alert went out and 78 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: 370 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

878 
WFUS54 KSHV 202330
TORSHV
ARC027-073-210000-
/O.NEW.KSHV.TO.W.0086.180620T2330Z-180621T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
630 PM CDT WED JUN 20 2018

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southeastern Lafayette County in southwestern Arkansas...
  Southwestern Columbia County in southwestern Arkansas...

* Until 700 PM CDT.
    
* At 630 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Bradley, or 10 miles northwest of Springhill,
  moving northeast at 15 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...
  Taylor around 655 PM CDT.
  Bussey and Smithland around 700 PM CDT.

Other locations impacted by this tornadic thunderstorm include Lerch,
Cornelius, McKamie, State Line and Mars Hill.

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 3304 9357 3319 9365 3334 9341 3312 9322
TIME...MOT...LOC 2330Z 247DEG 12KT 3312 9357 

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

$$

29

1 follow-up statement

085 
WWUS54 KSHV 202350
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
650 PM CDT WED JUN 20 2018

ARC027-073-210000-
/O.CON.KSHV.TO.W.0086.000000T0000Z-180621T0000Z/
Lafayette AR-Columbia AR-
650 PM CDT WED JUN 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
SOUTHEASTERN LAFAYETTE AND SOUTHWESTERN COLUMBIA COUNTIES...
    
At 649 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Bussey, or 10 miles north of Springhill, moving
northeast 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.

This dangerous storm will be near...
  Smithland and Macedonia around 700 PM CDT.

Other locations impacted by this tornadic thunderstorm include Lerch,
Cornelius, McKamie, State Line and Mars Hill.

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 3304 9357 3319 9365 3334 9341 3312 9322
TIME...MOT...LOC 2349Z 247DEG 16KT 3315 9348 

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

$$

29

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 4:57 PM CDT	Special Weather Statement	SHV	Hempstead, Lafayette, Miller, Nevada	33 min
Jun 20, 5:30 PM CDT	Special Weather Statement	SHV	Columbia, Hempstead, Lafayette, Miller, Nevada	45 min
Jun 20, 5:57 PM CDT	Tornado Warning	SHV	Columbia, Lafayette	18 min
Jun 20, 6:15 PM CDT	Tornado Warning	SHV	Columbia, Lafayette	15 min
Jun 20, 6:40 PM CDT	Tornado Warning	SHV	Lafayette	20 min
Jun 20, 6:59 PM CDT	Tornado Warning	SHV	Columbia, Lafayette	31 min

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.