Alert archive / Texas / Tornado Warnings in 2017

Tornado Warning 74, NWS Lake Charles, LA

August 27, 2017Jefferson County, Texas

NWS Lake Charles, LA issued this tornado warning at Aug 27, 2017, 7:00 PM CDT for Jefferson County, Texas. 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
Aug 27, 2017, 7:00 PM CDT (00:00 UTC)
Expired
Aug 27, 2017, 7:30 PM CDT
In force
30 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 Houston radar (KHGX), 84 km from the middle of the area, began a volume at 00:01 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, 0.0 hours before the alert went out and 111 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°0°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.

023 
WFUS54 KLCH 280000
TORLCH
TXC245-280030-
/O.NEW.KLCH.TO.W.0074.170828T0000Z-170828T0030Z/

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

The National Weather Service in Lake Charles has issued a

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

* Until 730 PM CDT
    
* At 659 PM CDT, a band of severe thunderstorms capable of producing 
  a tornado were located along a line extending from near Hamshire 
  to 10 miles southeast of Stowell, moving north at 30 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. 

* These dangerous storms will be near...
  Nome and China around 715 PM CDT. 
  Hamshire and La Belle around 720 PM CDT. 
  Fannett around 730 PM CDT. 

Other locations impacted by these tornadic storms include 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.

&&

LAT...LON 2957 9434 2960 9435 2989 9436 2989 9444
      3007 9444 3014 9421 2968 9402 2966 9409
TIME...MOT...LOC 2359Z 167DEG 25KT 2993 9435 2973 9422 

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

$$

24

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 7:24 PM CDTTornado WarningLCHJefferson51 min
Aug 27, 7:41 PM CDTFlash Flood WarningLCHHardin, Jasper, Jefferson, Orange10 hr
Aug 27, 9:54 PM CDTTornado WarningLCHJefferson36 min
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.