Alert archive / Texas / Tornado Warnings in 2017

Tornado Warning 76, NWS Lake Charles, LA

August 27, 2017Jefferson County, Texas

NWS Lake Charles, LA issued this tornado warning at Aug 27, 2017, 9:54 PM CDT for Jefferson County, Texas. It was in force for 36 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
Aug 27, 2017, 9:54 PM CDT (02:54 UTC)
Expired
Aug 27, 2017, 10:30 PM CDT
In force
36 min
Issued by
NWS Lake Charles, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Jefferson County, TX

The radar

The Lake Charles radar (KLCH), 81 km from the middle of the area, began a volume at 02:58 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.

IssuedProductOfficeLasted
Aug 27, 12:40 PM CDTTornado WatchSPC13 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.9 hours before the alert went out and 82 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, Lake Charles Mun, LA at 00:00Z on 2017-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 311 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2017-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 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
311 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
714 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
253 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted.

176 
WFUS54 KLCH 280254
TORLCH
TXC245-280330-
/O.NEW.KLCH.TO.W.0076.170828T0254Z-170828T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Lake Charles LA
954 PM CDT SUN AUG 27 2017

The National Weather Service in Lake Charles has issued a

* Tornado Warning for...
  Southeastern Jefferson County in southeastern Texas...

* Until 1030 PM CDT
    
* At 954 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Sabine Pass, moving northwest 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. 

* Locations impacted include...
  Port Arthur, Sabine Pass, Port Acres and Sea Rim State Park. 

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 2982 9422 2997 9397 2988 9391 2986 9393
      2984 9392 2985 9394 2984 9395 2982 9394
      2983 9392 2982 9392 2981 9395 2980 9395
      2981 9393 2977 9393 2976 9390 2969 9384
      2968 9400 2967 9407
TIME...MOT...LOC 0254Z 145DEG 17KT 2970 9394 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Jones
1 follow-up statement
528 
WWUS54 KLCH 280317
SVSLCH

Severe Weather Statement
National Weather Service Lake Charles LA
1017 PM CDT SUN AUG 27 2017

TXC245-280330-
/O.CON.KLCH.TO.W.0076.000000T0000Z-170828T0330Z/
Jefferson TX-
1017 PM CDT SUN AUG 27 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR EAST
CENTRAL JEFFERSON COUNTY...
    
At 1017 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Port Acres, or 8 miles northwest of
Sabine Pass, moving northwest 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. 

Locations impacted include...
Port Arthur and Port Acres. 

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 2996 9399 2986 9393 2984 9392 2985 9394
      2984 9395 2982 9394 2983 9392 2982 9392
      2981 9395 2980 9395 2981 9393 2979 9394
      2977 9394 2974 9402 2975 9405 2986 9415
TIME...MOT...LOC 0317Z 145DEG 17KT 2979 9401 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Jones

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 7:00 PM CDTTornado WarningLCHJefferson30 min
Aug 27, 7:24 PM CDTTornado WarningLCHJefferson51 min
Aug 27, 7:41 PM CDTFlash Flood WarningLCHHardin, Jasper, Jefferson, Orange10 hr
Aug 27, 11:58 PM CDTFlash Flood WarningLCHNewton, Orange8 hr
Aug 28, 12:19 AM CDTTornado WarningLCHJefferson, Orange26 min
Aug 28, 12:49 AM CDTSpecial Weather StatementLCHOrange41 min
Aug 28, 3:42 AM CDTTornado WarningLCHJefferson38 min
Aug 28, 4:55 AM CDTSpecial Weather StatementLCHOrange50 min
Aug 28, 5:00 AM CDTCoastal Flood AdvisoryLCH9 hr
Aug 28, 5:42 AM CDTFlash Flood Warning EmergencyLCHHardin, Jasper, Jefferson, Orange12 hr
Aug 28, 7:54 AM CDTFlash Flood WarningLCHNewton, Orange11 hr
Aug 28, 8:05 AM CDTFlash Flood WarningLCHJasper, Tyler11 hr
Aug 28, 9:18 AM CDTRiver Flood WarningLCHNewton10 days
Aug 28, 9:38 AM CDTTornado WarningLCHJasper, Newton22 min
Aug 28, 10:20 AM CDTTropical Storm WarningLCH58 hr
Aug 28, 10:31 AM CDTRiver Flood WarningLCHJasper, Tyler11 days
Aug 28, 10:31 AM CDTRiver Flood WarningLCHHardin, Jasper15 days
Aug 28, 2:26 PM CDTRiver Flood WarningLCHOrange13 days
Aug 28, 2:30 PM CDTTornado WarningLCHJefferson30 min
Aug 28, 3:14 PM CDTTornado WarningLCHJefferson31 min
Aug 28, 3:42 PM CDTTornado WarningLCHHardin, Jefferson33 min
Aug 28, 4:15 PM CDTStorm Surge WatchLCH51 hr
Aug 28, 5:55 PM CDTFlash Flood Warning EmergencyLCHHardin, Jasper, Jefferson, Newton, Orange28 hr

Nearby

Tornado Warnings in Texas, 2017Every tornado warning in 2017Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.