Alert archive / Texas / Tornado Warnings in 2018

Tornado Warning 33, NWS Shreveport, LA

April 6, 2018Cass County, Marion County, Texas

NWS Shreveport, LA issued this tornado warning at Apr 6, 2018, 4:44 PM CDT for Cass County, Marion County, Texas. It was in force for 21 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
Apr 6, 2018, 4:44 PM CDT (21:44 UTC)
Expired
Apr 6, 2018, 5:05 PM CDT
In force
21 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.5 in

Counties Cass County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 86 km from the middle of the area, began a volume at 21:46 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

TimeReportWhereRemark
Apr 6, 5:15 PM CDTHAIL 11 W Linden, TX

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.

IssuedProductOfficeLasted
Apr 6, 3:20 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 9.7 hours before the alert went out and 90 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2018-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 306 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2018-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
306 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
495 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

As transmitted.

288 
WFUS54 KSHV 062144
TORSHV
TXC067-315-062230-
/O.NEW.KSHV.TO.W.0033.180406T2144Z-180406T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
444 PM CDT FRI APR 6 2018

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Northeastern Marion County in northeastern Texas...
  Central Cass County in northeastern Texas...

* Until 530 PM CDT
    
* At 444 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles northeast of Hughes Springs, or 21 miles west
  of Atlanta, moving southeast at 30 mph.

  HAZARD...Tornado and ping pong ball 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. 

* This dangerous storm will be near...
  Linden around 510 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Fairview and Red 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 3306 9459 3319 9450 3308 9414 3288 9429
TIME...MOT...LOC 2144Z 300DEG 25KT 3310 9453 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

35
1 follow-up statement
096 
WWUS54 KSHV 062205
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
505 PM CDT FRI APR 6 2018

TXC067-315-062215-
/O.CAN.KSHV.TO.W.0033.000000T0000Z-180406T2230Z/
Marion TX-Cass TX-
505 PM CDT FRI APR 6 2018

...THE TORNADO WARNING FOR NORTHEASTERN MARION AND CENTRAL CASS
COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 1100 PM CDT for northeastern
Texas.

LAT...LON 3306 9459 3319 9450 3308 9414 3288 9429
TIME...MOT...LOC 2204Z 300DEG 25KT 3302 9437 

$$

35

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 6, 3:05 PM CDTSevere Thunderstorm WarningSHVBowie, Red River21 min
Apr 6, 3:24 PM CDTSpecial Weather StatementSHVRed River36 min
Apr 6, 3:36 PM CDTSevere Thunderstorm WarningSHVBowie, Cass, Morris, Red River, Titus54 min
Apr 6, 3:47 PM CDTSevere Thunderstorm WarningSHVBowie19 min
Apr 6, 3:52 PM CDTTornado WarningSHVBowie, Morris, Red River, Titus19 min
Apr 6, 4:10 PM CDTSevere Thunderstorm WarningSHVBowie, Cass, Morris, Red River65 min
Apr 6, 4:17 PM CDTTornado WarningSHVBowie, Cass, Morris19 min
Apr 6, 4:29 PM CDTSevere Thunderstorm WarningSHVFranklin, Red River, Titus46 min
Apr 6, 4:49 PM CDTSevere Thunderstorm WarningSHVBowie, Cass, Morris41 min
Apr 6, 4:54 PM CDTTornado WarningSHVCass14 min
Apr 6, 4:56 PM CDTSpecial Weather StatementSHVHarrison49 min
Apr 6, 5:04 PM CDTSevere Thunderstorm WarningSHVBowie, Cass, Harrison, Marion56 min
Apr 6, 5:15 PM CDTSevere Thunderstorm WarningSHVCamp, Franklin, Morris, Red River, Titus, Upshur and 1 more45 min
Apr 6, 5:18 PM CDTTornado WarningSHVCass, Marion13 min
Apr 6, 5:54 PM CDTSevere Thunderstorm WarningSHVHarrison, Marion51 min
Apr 6, 5:59 PM CDTSevere Thunderstorm WarningSHVCamp, Cass, Gregg, Harrison, Marion, Morris and 2 more46 min
Apr 6, 6:04 PM CDTSevere Thunderstorm WarningSHVHarrison26 min
Apr 6, 6:07 PM CDTSevere Thunderstorm WarningSHVPanola38 min
Apr 6, 6:11 PM CDTSevere Thunderstorm WarningSHVHarrison, Marion34 min
Apr 6, 6:24 PM CDTSevere Thunderstorm WarningSHVHarrison, Panola51 min
Apr 6, 6:37 PM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Panola, Rusk38 min
Apr 6, 6:49 PM CDTSevere Thunderstorm WarningSHVHarrison, Marion29 min

Nearby

Tornado Warnings in Texas, 2018Every tornado warning in 2018Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.