Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 321, NWS Norman, OK

May 22, 2020Carter County, Jefferson County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 22, 2020, 5:13 AM CDT for Carter County, Jefferson County, Stephens County, Oklahoma. It was in force for 47 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 22, 2020, 5:13 AM CDT (10:13 UTC)
Expired: May 22, 2020, 6:00 AM CDT
In force: 47 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carter County, OK, Jefferson County, OK, Stephens County, OK

The radar

The Altus AFB radar (KFDR), 121 km from the middle of the area, began a volume at 10:13 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

Norman, OK (KOUN), launched 00:00Z, 10.2 hours before the alert went out and 107 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: 922 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 885 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.9

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 22, 2:10 AM CDT, 3 hours 3 minutes earlier.

Area forecast discussion, May 22, 2:10 AM CDT, 3 hours 3 minutes before

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Hazardous weather outlook, May 22, 3:42 AM CDT, 1 hour 31 minutes before

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In the hours before

Local storm report, May 22, 4:43 AM CDT, 30 minutes before

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Local storm report, May 22, 5:00 AM CDT, 13 minutes before

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Local storm report, May 22, 5:03 AM CDT, 10 minutes before

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Special weather statement, May 22, 5:04 AM CDT, 9 minutes before

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Local storm report, May 22, 5:09 AM CDT, 4 minutes before

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Local storm report, May 22, 5:13 AM CDT, 0 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 22, 1:19 AM CDT	Special Weather Statement	OUN	Alfalfa, Harper, Woods, Woodward	26 min
May 22, 1:49 AM CDT	Special Weather Statement	OUN	Alfalfa, Woods, Woodward	41 min
May 22, 1:51 AM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	39 min
May 22, 2:12 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woods	18 min
May 22, 2:30 AM CDT	Special Weather Statement	OUN	Woods	30 min
May 22, 2:35 AM CDT	Special Weather Statement	OUN	Ellis, Grant, Major, Woodward	25 min
May 22, 2:44 AM CDT	Special Weather Statement	OUN	Woods	31 min
May 22, 3:02 AM CDT	Special Weather Statement	OUN	Blaine, Dewey, Ellis	28 min
May 22, 3:03 AM CDT	Special Weather Statement	OUN	Grant, Major	27 min
May 22, 3:06 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	39 min
May 22, 3:19 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	41 min
May 22, 3:40 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Major, Noble	50 min
May 22, 4:08 AM CDT	Special Weather Statement	OUN	Blaine	37 min
May 22, 4:20 AM CDT	Special Weather Statement	OUN	Blaine	25 min
May 22, 4:24 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Garfield, Grant, Kay, Kingfisher, Lincoln and 4 more	51 min
May 22, 4:40 AM CDT	Special Weather Statement	OUN	Stephens	35 min
May 22, 5:04 AM CDT	Special Weather Statement	OUN	Stephens	26 min
May 22, 5:07 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Logan, Noble, Oklahoma, Payne and 2 more	38 min
May 22, 5:20 AM CDT	Special Weather Statement	OUN	McClain	25 min
May 22, 5:39 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Payne, Pottawatomie, Seminole	51 min
May 22, 5:53 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Grady, McClain, Murray, Stephens	52 min
May 22, 6:22 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	35 min
May 22, 6:24 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Lincoln, Pottawatomie, Seminole	51 min
May 22, 6:41 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Murray, Pontotoc, Pottawatomie, Seminole	49 min
May 22, 6:56 AM CDT	Special Weather Statement	OUN	Carter	34 min
May 22, 7:30 AM CDT	Special Weather Statement	OUN	Carter, Murray	30 min
May 22, 7:59 AM CDT	Special Weather Statement	OUN	Carter, Murray	31 min
May 22, 4:47 PM CDT	Special Weather Statement	OUN	Tillman	13 min
May 22, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	33 min
May 22, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	47 min
May 22, 5:47 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	28 min
May 22, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	57 min
May 22, 6:12 PM CDT	Tornado Warning	OUN	Tillman	33 min
May 22, 6:18 PM CDT	Special Weather Statement	OUN	Comanche	27 min
May 22, 6:20 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	25 min
May 22, 6:22 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	53 min
May 22, 6:39 PM CDT	Special Weather Statement	OUN	Caddo	36 min
May 22, 6:50 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	40 min
May 22, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	48 min
May 21, 8:01 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	44 min
May 21, 8:33 PM CDT	Special Weather Statement	OUN	Baylor	12 min
May 21, 8:40 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox, Wilbarger	50 min
May 21, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	17 min
May 22, 6:41 PM CDT	Special Weather Statement	OUN	Clay	34 min
May 22, 6:53 PM CDT	Severe Thunderstorm Warning	OUN	Clay	52 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Every severe thunderstorm warning in 2020

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.