Alert archive / Texas / Tornado Warnings in 2017

Tornado Warning 89, NWS Norman, OK

August 12, 2017Baylor County, Texas

NWS Norman, OK issued this tornado warning at Aug 12, 2017, 6:41 PM CDT for Baylor County, Texas. It was in force for 34 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 12, 2017, 6:41 PM CDT (23:41 UTC)
Expired: Aug 12, 2017, 7:15 PM CDT
In force: 34 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Baylor County, TX

The radar

The Dyess AFB radar (KDYX), 101 km from the middle of the area, began a volume at 23:44 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

Fort Worth, TX (KFWD), launched 12:00Z, 11.7 hours before the alert went out and 182 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: 987 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 1269 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

465 
WFUS54 KOUN 122341
TOROUN
TXC023-130015-
/O.NEW.KOUN.TO.W.0089.170812T2341Z-170813T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
641 PM CDT SAT AUG 12 2017

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Southeastern Baylor County in northern Texas...

* Until 715 PM CDT
    
* At 641 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles southeast of Seymour, moving east at 20 mph.

  HAZARD...Tornado and quarter 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 tornadic thunderstorm will remain over mainly rural areas of
  southeastern Baylor County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter, safe room 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 3340 9914 3342 9925 3351 9924 3348 9895
      3340 9895
TIME...MOT...LOC 2341Z 284DEG 15KT 3347 9918 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

..speg.

1 follow-up statement

896 
WWUS54 KOUN 130005
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
705 PM CDT SAT AUG 12 2017

TXC023-130015-
/O.EXP.KOUN.TO.W.0089.000000T0000Z-170813T0015Z/
Baylor TX-
705 PM CDT SAT AUG 12 2017

...THE TORNADO WARNING FOR SOUTHEASTERN BAYLOR COUNTY WILL EXPIRE AT
715 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

LAT...LON 3340 9914 3342 9925 3351 9924 3348 9895
      3340 9895
TIME...MOT...LOC 0005Z 284DEG 15KT 3345 9907 

$$

..speg.

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 1:57 PM CDT	Special Weather Statement	OUN	Clay	33 min
Aug 12, 2:30 PM CDT	Severe Thunderstorm Warning	OUN	Clay	30 min
Aug 12, 3:00 PM CDT	Severe Thunderstorm Warning	OUN	Clay	45 min
Aug 12, 3:46 PM CDT	Special Weather Statement	OUN	Clay	59 min
Aug 12, 4:10 PM CDT	Special Weather Statement	OUN	Knox	50 min
Aug 12, 4:29 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	61 min
Aug 12, 4:36 PM CDT	Special Weather Statement	OUN	Archer	24 min
Aug 12, 4:58 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	47 min
Aug 12, 5:02 PM CDT	Severe Thunderstorm Warning	OUN	Knox	43 min
Aug 12, 5:42 PM CDT	Special Weather Statement	OUN	Wichita	33 min
Aug 12, 6:00 PM CDT	Special Weather Statement	OUN	Baylor	30 min
Aug 12, 6:27 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	48 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.