Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 118, NWS Norman, OK

May 13, 2018Harper County, Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 13, 2018, 4:36 PM CDT for Harper County, Woods County, Oklahoma. It was in force for 29 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 13, 2018, 4:36 PM CDT (21:36 UTC)
Expired: May 13, 2018, 5:05 PM CDT
In force: 29 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Harper County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 102 km from the middle of the area, began a volume at 21:37 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 13, 3:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 9.6 hours before the alert went out and 124 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: 397 J/kg
Mixed-layer CIN: -617 J/kg
Mixed-layer LCL: 904 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 355 m²/s²
0-3 km storm-relative helicity: 341 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 13, 2:49 PM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, May 13, 2:49 PM CDT, 1 hour 47 minutes before

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Hazardous weather outlook, May 13, 3:02 PM CDT, 1 hour 34 minutes before

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In the hours before

Special weather statement, May 13, 4:21 PM CDT, 15 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 12, 10:34 PM CDT	High Wind Warning	OUN	Custer, Dewey, Ellis, Harper, Roger Mills, Woods and 1 more	86 min
May 13, 9:00 AM CDT	Special Weather Statement	OUN	Alfalfa	30 min
May 13, 4:21 PM CDT	Special Weather Statement	OUN	Harper	24 min
May 13, 6:42 PM CDT	Special Weather Statement	OUN	Beckham, Ellis, Roger Mills	18 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.