Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 143, NWS Norman, OK

May 10, 20115 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 10, 2011, 1:28 PM CDT for 5 counties in Oklahoma. It was in force for 62 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: May 10, 2011, 1:28 PM CDT (18:28 UTC)
Expired: May 10, 2011, 2:30 PM CDT
In force: 62 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Carter County, OK, Garvin County, OK, Johnston County, OK, Murray County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 96 km from the middle of the area, began a volume at 18:29 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

Lamont, OK (KLMN), launched 12:00Z, 6.5 hours before the alert went out and 240 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: 718 J/kg
Mixed-layer CIN: -563 J/kg
Mixed-layer LCL: 1936 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 266 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 May 10, 12:27 PM CDT, 1 hour 1 minute earlier.

Area forecast discussion, May 10, 12:27 PM CDT, 1 hour 1 minute before

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Hazardous weather outlook, May 10, 11:55 AM CDT, 1 hour 33 minutes before

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In the hours before

Special weather statement, May 10, 12:42 PM CDT, 46 minutes before

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Special weather statement, May 10, 12:56 PM CDT, 32 minutes before

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Special weather statement, May 10, 1:19 PM CDT, 9 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
May 9, 9:11 PM CDT	Red Flag Warning	OUN	Alfalfa, Beckham, Blaine, Caddo, Comanche, Custer and 13 more	19 hr
May 10, 12:42 PM CDT	Special Weather Statement	OUN	Jefferson	18 min
May 10, 12:56 PM CDT	Special Weather Statement	OUN	Carter, Jefferson	19 min
May 10, 1:19 PM CDT	Special Weather Statement	OUN	Carter, Garvin, Murray, Pontotoc	41 min
May 10, 1:37 PM CDT	Special Weather Statement	OUN	Harper	38 min
May 10, 2:07 PM CDT	Special Weather Statement	OUN	Seminole	8 min
May 10, 3:47 PM CDT	Special Weather Statement	OUN	Payne	13 min
May 10, 3:57 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	48 min
May 10, 3:41 PM CDT	Fire Weather Watch	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	12 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

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.