Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 576, NWS Norman, OK

July 31, 2015Archer County, Wichita County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jul 31, 2015, 4:59 PM CDT for Archer County, Wichita County, Texas. 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 counties it named.

The facts

Issued: Jul 31, 2015, 4:59 PM CDT (21:59 UTC)
Expired: Jul 31, 2015, 5:45 PM CDT
In force: 46 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Archer County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 67 km from the middle of the area, began a volume at 22:00 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.0 hours before the alert went out and 318 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: 1099 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 3:01 PM CDT, 1 hour 58 minutes earlier.

Area forecast discussion, Jul 31, 3:01 PM CDT, 1 hour 58 minutes before

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Hazardous weather outlook, Jul 31, 3:20 PM CDT, 1 hour 39 minutes before

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In the hours before

Special weather statement, Jul 31, 4:28 PM CDT, 31 minutes before

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Special weather statement, Jul 31, 4:31 PM CDT, 28 minutes before

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Local storm report, Jul 31, 4:41 PM CDT, 18 minutes before

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Special weather statement, Jul 31, 4:44 PM CDT, 15 minutes before

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Special weather statement, Jul 31, 4:47 PM CDT, 12 minutes before

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Special weather statement, Jul 31, 4:55 PM CDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:58 AM CDT	Special Weather Statement	OUN	Comanche	32 min
Jul 31, 9:42 AM CDT	Special Weather Statement	OUN	Pontotoc	33 min
Jul 31, 12:44 PM CDT	Special Weather Statement	OUN	Roger Mills	31 min
Jul 31, 1:56 PM CDT	Special Weather Statement	OUN	Custer, Greer, Jackson	34 min
Jul 31, 2:32 PM CDT	Special Weather Statement	OUN	Custer, Dewey, Kiowa, Washita	28 min
Jul 31, 3:02 PM CDT	Special Weather Statement	OUN	Custer, Dewey, Kiowa, Tillman, Washita	28 min
Jul 31, 3:05 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	40 min
Jul 31, 3:19 PM CDT	Special Weather Statement	OUN	Oklahoma	26 min
Jul 31, 3:33 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	42 min
Jul 31, 3:41 PM CDT	Special Weather Statement	OUN	Oklahoma	34 min
Jul 31, 3:56 PM CDT	Special Weather Statement	OUN	Caddo	34 min
Jul 31, 4:16 PM CDT	Areal Flood Advisory	OUN	Caddo, Washita	3 hr
Jul 31, 4:28 PM CDT	Special Weather Statement	OUN	Caddo	32 min
Jul 31, 4:31 PM CDT	Special Weather Statement	OUN	Logan	44 min
Jul 31, 4:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	38 min
Jul 31, 4:55 PM CDT	Special Weather Statement	OUN	Canadian	50 min
Jul 31, 5:06 PM CDT	Special Weather Statement	OUN	Grady	54 min
Jul 31, 5:14 PM CDT	Special Weather Statement	OUN	Grady	61 min
Jul 31, 5:48 PM CDT	Areal Flood Advisory	OUN	Grady	3 hr
Jul 31, 6:57 PM CDT	Special Weather Statement	OUN	Stephens	48 min
Jul 31, 3:57 PM CDT	Special Weather Statement	OUN	Baylor	33 min
Jul 31, 4:22 PM CDT	Special Weather Statement	OUN	Wichita	38 min
Jul 31, 4:44 PM CDT	Special Weather Statement	OUN	Archer	31 min
Jul 31, 4:47 PM CDT	Special Weather Statement	OUN	Clay	43 min
Jul 31, 4:58 PM CDT	Severe Thunderstorm Warning	OUN	Clay	47 min
Jul 31, 5:01 PM CDT	Areal Flood Advisory	OUN	Archer	3 hr
Jul 31, 5:25 PM CDT	Flash Flood Warning	OUN	Archer	3 hr
Jul 31, 5:34 PM CDT	Special Weather Statement	OUN	Clay	41 min
Jul 31, 5:46 PM CDT	Special Weather Statement	OUN	Archer, Clay	59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning in 2015

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.