Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 85, NWS Norman, OK

April 17, 20195 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 17, 2019, 6:56 PM CDT for 5 counties in Oklahoma. It was in force for 49 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: Apr 17, 2019, 6:56 PM CDT (23:56 UTC)
Expired: Apr 17, 2019, 7:45 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Blaine County, OK, Custer County, OK, Dewey County, OK, Major County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 101 km from the middle of the area, began a volume at 23:56 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
Apr 17, 1:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.9 hours before the alert went out and 160 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: 446 J/kg
Mixed-layer CIN: -373 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 355 m²/s²
0-3 km storm-relative helicity: 369 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 Apr 17, 6:19 PM CDT, 37 minutes earlier.

Area forecast discussion, Apr 17, 6:19 PM CDT, 37 minutes before

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Hazardous weather outlook, Apr 17, 6:06 PM CDT, 50 minutes before

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In the hours before

Local storm report, Apr 17, 5:45 PM CDT, 1 hour 11 minutes before

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Special weather statement, Apr 17, 6:27 PM CDT, 29 minutes before

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Local storm report, Apr 17, 6:30 PM CDT, 26 minutes before

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Local storm report, Apr 17, 6:39 PM CDT, 17 minutes before

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Local storm report, Apr 17, 6:42 PM CDT, 14 minutes before

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Special weather statement, Apr 17, 6:42 PM CDT, 14 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
Apr 17, 3:11 PM CDT	Special Weather Statement	OUN	Roger Mills	34 min
Apr 17, 3:25 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	50 min
Apr 17, 4:06 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	39 min
Apr 17, 4:31 PM CDT	Special Weather Statement	OUN	Ellis	29 min
Apr 17, 4:39 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	51 min
Apr 17, 4:43 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	47 min
Apr 17, 4:49 PM CDT	Tornado Warning	OUN	Ellis	41 min
Apr 17, 5:05 PM CDT	Areal Flood Advisory	OUN	Ellis, Harper, Woods, Woodward	3 hr
Apr 17, 5:24 PM CDT	Tornado Warning	OUN	Ellis	36 min
Apr 17, 5:25 PM CDT	Special Weather Statement	OUN	Beckham	35 min
Apr 17, 5:27 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	48 min
Apr 17, 5:31 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	44 min
Apr 17, 5:32 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	43 min
Apr 17, 5:34 PM CDT	Tornado Warning	OUN	Custer, Roger Mills	16 min
Apr 17, 5:49 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	41 min
Apr 17, 6:07 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	38 min
Apr 17, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	52 min
Apr 17, 6:12 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	48 min
Apr 17, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	46 min
Apr 17, 6:21 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Harper, Woods, Woodward	114 min
Apr 17, 6:27 PM CDT	Special Weather Statement	OUN	Woods	33 min
Apr 17, 6:42 PM CDT	Special Weather Statement	OUN	Woodward	33 min
Apr 17, 6:52 PM CDT	Flash Flood Warning	OUN	Alfalfa, Harper, Woods, Woodward	3 hr
Apr 17, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Clay	50 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2019 Every severe thunderstorm warning in 2019

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.