Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 124, NWS Norman, OK

April 22, 2020Bryan County, Johnston County, Marshall County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 22, 2020, 3:12 AM CDT for Bryan County, Johnston County, Marshall 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: Apr 22, 2020, 3:12 AM CDT (08:12 UTC)
Expired: Apr 22, 2020, 3:41 AM CDT
In force: 29 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bryan County, OK, Johnston County, OK, Marshall County, OK

The radar

The Norman radar (KTLX), 152 km from the middle of the area, began a volume at 08:15 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 22, 1:46 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.2 hours before the alert went out and 146 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: 46 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 2104 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 279 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 22, 2:57 AM CDT, 15 minutes earlier.

Area forecast discussion, Apr 22, 2:57 AM CDT, 15 minutes before

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Hazardous weather outlook, Apr 22, 1:55 AM CDT, 1 hour 17 minutes before

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In the hours before

Local storm report, Apr 22, 2:29 AM CDT, 43 minutes before

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Local storm report, Apr 22, 2:30 AM CDT, 42 minutes before

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Local storm report, Apr 22, 2:40 AM CDT, 32 minutes before

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Local storm report, Apr 22, 2:44 AM CDT, 28 minutes before

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Local storm report, Apr 22, 2:52 AM CDT, 20 minutes before

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Local storm report, Apr 22, 3:02 AM CDT, 10 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 21, 7:09 PM CDT	Special Weather Statement	OUN	Washita	36 min
Apr 21, 7:15 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	60 min
Apr 21, 7:24 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	66 min
Apr 21, 7:32 PM CDT	Special Weather Statement	OUN	Beckham	28 min
Apr 21, 7:33 PM CDT	Special Weather Statement	OUN	Caddo	27 min
Apr 21, 7:40 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	50 min
Apr 21, 7:56 PM CDT	Special Weather Statement	OUN	Beckham	34 min
Apr 21, 8:06 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	39 min
Apr 21, 8:13 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills	62 min
Apr 21, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Custer, Washita	58 min
Apr 21, 8:18 PM CDT	Tornado Warning	OUN	Beckham, Custer, Washita	19 min
Apr 21, 8:24 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	51 min
Apr 21, 8:28 PM CDT	Special Weather Statement	OUN	Greer	32 min
Apr 21, 8:34 PM CDT	Areal Flood Advisory	OUN	Caddo, Washita	3 hr
Apr 21, 8:40 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	50 min
Apr 21, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	45 min
Apr 21, 8:50 PM CDT	Areal Flood Advisory	OUN	Beckham, Custer, Roger Mills, Washita	3 hr
Apr 21, 9:04 PM CDT	Special Weather Statement	OUN	Greer	26 min
Apr 21, 9:08 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	67 min
Apr 21, 9:17 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	43 min
Apr 21, 9:20 PM CDT	Severe Thunderstorm Warning	OUN	Washita	40 min
Apr 21, 9:33 PM CDT	Special Weather Statement	OUN	Kiowa	27 min
Apr 21, 9:46 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	44 min
Apr 21, 9:54 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	66 min
Apr 21, 9:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	64 min
Apr 21, 10:01 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	44 min
Apr 21, 10:06 PM CDT	Areal Flood Advisory	OUN	Washita	3 hr
Apr 21, 10:18 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	42 min
Apr 21, 10:30 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	45 min
Apr 21, 10:39 PM CDT	Special Weather Statement	OUN	Roger Mills	36 min
Apr 21, 10:49 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	56 min
Apr 21, 10:54 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Stephens	66 min
Apr 21, 11:00 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	45 min
Apr 21, 11:09 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	51 min
Apr 21, 11:28 PM CDT	Tornado Warning	OUN	Comanche, Grady, Stephens	32 min
Apr 21, 11:39 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	26 min
Apr 21, 11:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	62 min
Apr 21, 11:47 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens	43 min
Apr 21, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Grady, Stephens	57 min
Apr 21, 11:53 PM CDT	Tornado Warning	OUN	Stephens	52 min
Apr 22, 12:04 AM CDT	Severe Thunderstorm Warning	OUN	Dewey	41 min
Apr 22, 12:14 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	31 min
Apr 22, 12:16 AM CDT	Tornado Warning	OUN	Carter, Garvin, Murray, Stephens	27 min
Apr 22, 12:26 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray, Stephens	64 min
Apr 22, 12:33 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Stephens	57 min
Apr 22, 12:44 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, Stephens	46 min
Apr 22, 1:10 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Murray	50 min
Apr 22, 1:24 AM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Murray	3 hr
Apr 22, 1:26 AM CDT	Special Weather Statement	OUN	Garvin	34 min
Apr 22, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Stephens	49 min
Apr 22, 1:49 AM CDT	Flash Flood Warning	OUN	Carter, Murray	3 hr
Apr 22, 1:50 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston	70 min
Apr 22, 2:00 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	45 min
Apr 22, 2:06 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	25 hr
Apr 22, 2:14 AM CDT	Special Weather Statement	OUN	Johnston	31 min
Apr 22, 2:24 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston	51 min
Apr 22, 2:34 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Marshall	41 min
Apr 22, 2:57 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	18 min
Apr 22, 3:58 AM CDT	Special Weather Statement	OUN	Woods	32 min
Apr 22, 4:28 AM CDT	Special Weather Statement	OUN	Ellis	32 min
Apr 22, 4:34 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills, Woodward	41 min
Apr 22, 4:48 AM CDT	Special Weather Statement	OUN	Alfalfa	27 min
Apr 22, 4:49 AM CDT	Special Weather Statement	OUN	Garfield	26 min
Apr 22, 4:53 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant, Woods	52 min
Apr 22, 5:03 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Major	42 min
Apr 22, 5:09 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Woodward	51 min
Apr 22, 5:21 AM CDT	Special Weather Statement	OUN	Kingfisher	24 min
Apr 22, 5:22 AM CDT	Special Weather Statement	OUN	Atoka, Coal	38 min
Apr 22, 5:32 AM CDT	Flood Watch	OUN	Alfalfa, Garfield, Grant, Kay, Major, Noble and 1 more	13 hr
Apr 22, 5:41 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Kay, Logan, Noble and 1 more	49 min
Apr 22, 5:52 AM CDT	Severe Thunderstorm Warning	OUN	Harper, Major, Woods, Woodward	53 min
Apr 22, 6:23 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble, Payne	52 min
Apr 22, 6:46 AM CDT	Special Weather Statement	OUN	Woods	29 min
Apr 22, 7:15 AM CDT	Special Weather Statement	OUN	Kay	30 min
Apr 22, 7:33 AM CDT	Special Weather Statement	OUN	Kay	27 min
Apr 22, 7:58 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	47 min
Apr 22, 8:00 AM CDT	Special Weather Statement	OUN	Kay	30 min
Apr 22, 8:19 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	41 min
Apr 22, 8:22 AM CDT	Special Weather Statement	OUN	Atoka	38 min
Apr 22, 8:33 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	42 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.