Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 721, NWS Norman, OK

July 27, 2017Washita County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 27, 2017, 5:44 PM CDT for Washita County, Oklahoma. It was in force for 46 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: Jul 27, 2017, 5:44 PM CDT (22:44 UTC)
Expired: Jul 27, 2017, 6:30 PM CDT
In force: 46 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Washita County, OK

The radar

The Altus AFB radar (KFDR), 103 km from the middle of the area, began a volume at 22:44 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

Norman, OK (KOUN), launched 12:00Z, 10.7 hours before the alert went out and 140 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: 53 J/kg
Mixed-layer CIN: -252 J/kg
Mixed-layer LCL: 1644 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

674 
WUUS54 KOUN 272244
SVROUN
OKC149-272330-
/O.NEW.KOUN.SV.W.0721.170727T2244Z-170727T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
544 PM CDT THU JUL 27 2017

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Central Washita County in western Oklahoma...

* Until 630 PM CDT

* At 544 PM CDT, a severe thunderstorm was located near Cordell,
  moving north at 5 mph.

  HAZARD...70 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Cordell, Burns Flat, Dill City, Corn, Bessie and Cloud Chief. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3519 9878 3514 9897 3526 9911 3536 9921
      3543 9898 3542 9877
TIME...MOT...LOC 2244Z 188DEG 5KT 3529 9897 

HAIL...0.75IN
WIND...70MPH
 
$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 3:46 PM CDT	Special Weather Statement	OUN	Canadian	29 min
Jul 27, 4:28 PM CDT	Special Weather Statement	OUN	Caddo	32 min
Jul 27, 4:35 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	25 min
Jul 27, 4:41 PM CDT	Special Weather Statement	OUN	Caddo	34 min
Jul 27, 4:53 PM CDT	Special Weather Statement	OUN	Washita	37 min
Jul 27, 5:00 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	45 min
Jul 27, 5:16 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	44 min
Jul 27, 5:28 PM CDT	Special Weather Statement	OUN	Kay	62 min
Jul 27, 5:34 PM CDT	Special Weather Statement	OUN	Canadian	41 min
Jul 27, 5:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	52 min
Jul 27, 5:55 PM CDT	Special Weather Statement	OUN	Oklahoma	35 min
Jul 27, 5:59 PM CDT	Severe Thunderstorm Warning	OUN	Washita	46 min
Jul 27, 6:02 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	58 min
Jul 27, 6:03 PM CDT	Special Weather Statement	OUN	Greer	27 min
Jul 27, 6:19 PM CDT	Special Weather Statement	OUN	Canadian	41 min
Jul 27, 6:27 PM CDT	Special Weather Statement	OUN	Oklahoma	48 min
Jul 27, 6:32 PM CDT	Special Weather Statement	OUN	Beckham	28 min
Jul 27, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	36 min
Jul 27, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	33 min
Jul 27, 6:53 PM CDT	Special Weather Statement	OUN	Canadian	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning 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.