Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 283, NWS Norman, OK

May 29, 2011Ellis County, Harper County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 29, 2011, 4:46 PM CDT for Ellis County, Harper County, Oklahoma. It was in force for 74 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 29, 2011, 4:46 PM CDT (21:46 UTC)
Expired: May 29, 2011, 6:00 PM CDT
In force: 74 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Ellis County, OK, Harper County, OK

The radar

The Dodge City radar (KDDC), 142 km from the middle of the area, began a volume at 21:45 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

Dodge City, (KDDC), launched 12:00Z, 9.8 hours before the alert went out and 142 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: 90 J/kg
Mixed-layer CIN: -999 J/kg
Mixed-layer LCL: 1225 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 269 m²/s²
0-3 km storm-relative helicity: 278 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 29, 1:55 PM CDT, 2 hours 51 minutes earlier.

Area forecast discussion, May 29, 1:55 PM CDT, 2 hours 51 minutes before

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Hazardous weather outlook, May 29, 11:45 AM CDT, 5 hours 1 minute before

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In the hours before

Special weather statement, May 29, 4:06 PM CDT, 40 minutes before

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Special weather statement, May 29, 4:26 PM CDT, 20 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 29, 3:38 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 19 more	15 hr
May 29, 4:06 PM CDT	Special Weather Statement	OUN	Ellis	24 min
May 29, 4:26 PM CDT	Special Weather Statement	OUN	Harper	19 min
May 29, 5:56 PM CDT	Special Weather Statement	OUN	Ellis	19 min
May 29, 6:15 PM CDT	Special Weather Statement	OUN	Harper	15 min

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.