Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 35, NWS Norman, OK

March 31, 2015Harmon County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 31, 2015, 6:15 PM CDT for Harmon County, Oklahoma. It was in force for 30 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: Mar 31, 2015, 6:15 PM CDT (23:15 UTC)
Expired: Mar 31, 2015, 6:45 PM CDT
In force: 30 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Harmon County, OK

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 31, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.3 hours before the alert went out and 177 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2881 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 12 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 Mar 31, 3:17 PM CDT, 2 hours 58 minutes earlier.

Area forecast discussion, Mar 31, 3:17 PM CDT, 2 hours 58 minutes before

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Hazardous weather outlook, Mar 31, 12:00 PM CDT, 6 hours 15 minutes before

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In the hours before

Special weather statement, Mar 31, 5:30 PM CDT, 45 minutes before

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Special weather statement, Mar 31, 6:00 PM CDT, 15 minutes before

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Special weather statement, Mar 31, 6:02 PM CDT, 13 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
Mar 31, 5:51 AM CDT	Dense Fog Advisory	OUN	Caddo, Canadian, Carter, Cleveland, Coal, Comanche and 26 more	4 hr
Mar 31, 3:31 PM CDT	Fire Weather Watch	OUN	Ellis, Harper, Roger Mills, Woods, Woodward	12 hr
Mar 31, 5:30 PM CDT	Special Weather Statement	OUN	Harmon	30 min
Mar 31, 6:00 PM CDT	Special Weather Statement	OUN	Ellis	30 min
Mar 31, 6:02 PM CDT	Special Weather Statement	OUN	Harmon	28 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.