Alert archive / Texas / Tornado Warnings in 2017

Tornado Warning 59, NWS Lake Charles, LA

August 27, 2017Jefferson County, Texas

NWS Lake Charles, LA issued this tornado warning at Aug 27, 2017, 8:52 AM CDT for Jefferson County, Texas. It was in force for 23 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, 8:52 AM CDT (13:52 UTC)
Expired: Aug 27, 2017, 9:15 AM CDT
In force: 23 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), 83 km from the middle of the area, began a volume at 13:52 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.9 hours before the alert went out and 84 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: 323 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 934 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

058 
WFUS54 KLCH 271352
TORLCH
TXC245-271415-
/O.NEW.KLCH.TO.W.0059.170827T1352Z-170827T1415Z/

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

The National Weather Service in Lake Charles has issued a

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

* Until 915 AM CDT
    
* At 851 AM CDT, a severe thunderstorm capable of producing a tornado
  was located over Port Acres, or 7 miles southwest of Nederland,
  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. 

* This dangerous storm will be near...
  Nederland and Southeast Texas Regional Airport around 900 AM CDT. 
  Central Gardens around 905 AM CDT. 

Other locations impacted by this tornadic thunderstorm 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 3008 9443 3011 9408 3010 9409 3008 9409
      3007 9403 3003 9403 3003 9400 2985 9393
      2983 9395 2982 9392 2981 9395 2980 9395
      2981 9393 2977 9393 2977 9390 2968 9387
      2968 9400 2966 9417
TIME...MOT...LOC 1351Z 168DEG 27KT 2989 9408 

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

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 1:21 AM CDT	Flash Flood Warning Emergency	LCH	Hardin, Jasper, Jefferson, Orange	14 hr
Aug 27, 8:15 AM CDT	River Flood Warning	LCH	Hardin	8 days
Aug 27, 8:29 AM CDT	Flash Flood Warning	LCH	Jasper, Newton, Tyler	6 hr
Aug 27, 9:18 AM CDT	Tornado Warning	LCH	Hardin, Jasper, Jefferson, Orange	27 min
Aug 27, 9:43 AM CDT	Tornado Warning	LCH	Hardin, Jasper, Jefferson, Orange	32 min
Aug 27, 9:55 AM CDT	Flash Flood Warning	LCH	Newton, Orange	5 hr
Aug 27, 10:15 AM CDT	Tornado Warning	LCH	Hardin, Jasper, Orange	30 min
Aug 27, 10:43 AM CDT	Tornado Warning	LCH	Hardin, Jasper, Tyler	32 min
Aug 27, 10:47 AM CDT	Special Weather Statement	LCH	Orange	58 min
Aug 27, 1:50 PM CDT	Tornado Warning	LCH	Newton	25 min
Aug 27, 2:31 PM CDT	Flash Flood Warning	LCH	Jasper, Newton, Tyler	5 hr
Aug 27, 2:47 PM CDT	Flash Flood Warning	LCH	Hardin, Jasper, Jefferson, Newton, Orange	5 hr
Aug 27, 6:02 PM CDT	Tornado Warning	LCH	Jefferson	28 min
Aug 27, 6:27 PM CDT	Tornado Warning	LCH	Jefferson	33 min

Nearby

Tornado Warnings in Texas, 2017 Every tornado warning in 2017 Tornadoes 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.