Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 652, NWS Norman, OK

August 16, 2020Alfalfa County, Garfield County, Major County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 16, 2020, 10:54 AM CDT for Alfalfa County, Garfield County, Major County, Oklahoma. It was in force for 51 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: Aug 16, 2020, 10:54 AM CDT (15:54 UTC)
Expired: Aug 16, 2020, 11:45 AM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alfalfa County, OK, Garfield County, OK, Major County, OK

The radar

The Vance AFB radar (KVNX), 31 km from the middle of the area, began a volume at 15:55 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 3.9 hours before the alert went out and 343 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: 417 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 2353 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -75 m²/s²
0-3 km storm-relative helicity: -23 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 Aug 16, 6:27 AM CDT, 4 hours 27 minutes earlier.

Area forecast discussion, Aug 16, 6:27 AM CDT, 4 hours 27 minutes before

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Hazardous weather outlook, Aug 16, 10:31 AM CDT, 23 minutes before

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In the hours before

Special weather statement, Aug 16, 8:57 AM CDT, 1 hour 57 minutes before

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Special weather statement, Aug 16, 9:29 AM CDT, 1 hour 25 minutes before

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Special weather statement, Aug 16, 9:51 AM CDT, 1 hour 3 minutes before

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Special weather statement, Aug 16, 9:52 AM CDT, 1 hour 2 minutes before

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Special weather statement, Aug 16, 10:20 AM CDT, 34 minutes before

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Special weather statement, Aug 16, 10:24 AM CDT, 30 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
Aug 16, 7:26 AM CDT	Special Weather Statement	OUN	Woods	49 min
Aug 16, 7:58 AM CDT	Special Weather Statement	OUN	Woods	62 min
Aug 16, 8:57 AM CDT	Special Weather Statement	OUN	Alfalfa, Woods	63 min
Aug 16, 9:29 AM CDT	Special Weather Statement	OUN	Harper	61 min
Aug 16, 9:51 AM CDT	Special Weather Statement	OUN	Garfield	39 min
Aug 16, 9:52 AM CDT	Special Weather Statement	OUN	Woods	53 min
Aug 16, 10:20 AM CDT	Special Weather Statement	OUN	Harper	25 min
Aug 16, 10:24 AM CDT	Special Weather Statement	OUN	Major	51 min
Aug 16, 10:35 AM CDT	Areal Flood Advisory	OUN	Harper	3 hr
Aug 16, 11:02 AM CDT	Special Weather Statement	OUN	Harper	28 min
Aug 16, 11:38 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Major	52 min
Aug 16, 12:18 PM CDT	Heat Advisory	OUN	Atoka, Bryan, Carter, Coal, Garvin, Hughes and 8 more	7 hr
Aug 16, 12:22 PM CDT	Special Weather Statement	OUN	Blaine	53 min
Aug 16, 12:40 PM CDT	Special Weather Statement	OUN	Kingfisher, Logan	35 min
Aug 16, 1:57 PM CDT	Special Weather Statement	OUN	Atoka	33 min
Aug 16, 2:07 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	56 min
Aug 16, 2:24 PM CDT	Special Weather Statement	OUN	McClain	51 min
Aug 16, 2:43 PM CDT	Special Weather Statement	OUN	McClain	47 min
Aug 16, 2:49 PM CDT	Special Weather Statement	OUN	McClain	41 min
Aug 16, 3:02 PM CDT	Special Weather Statement	OUN	Roger Mills	58 min
Aug 16, 3:05 PM CDT	Special Weather Statement	OUN	Bryan	40 min
Aug 16, 3:08 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	52 min
Aug 16, 3:14 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	46 min
Aug 16, 3:22 PM CDT	Special Weather Statement	OUN	Johnston	38 min
Aug 16, 3:42 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Murray	63 min
Aug 16, 3:48 PM CDT	Special Weather Statement	OUN	Bryan	42 min
Aug 16, 3:57 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	63 min
Aug 16, 4:10 PM CDT	Special Weather Statement	OUN	Custer, Roger Mills	35 min
Aug 16, 4:13 PM CDT	Special Weather Statement	OUN	Marshall	47 min
Aug 16, 4:19 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love, Stephens	56 min
Aug 16, 4:20 PM CDT	Special Weather Statement	OUN	Jefferson	55 min
Aug 16, 4:33 PM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Marshall, Murray	3 hr
Aug 16, 4:46 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall, Murray	56 min
Aug 16, 5:07 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	68 min
Aug 16, 5:36 PM CDT	Severe Thunderstorm Warning	OUN	Love, Marshall	39 min
Aug 16, 5:41 PM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Kiowa	49 min
Aug 16, 5:51 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Greer, Harmon, Jackson, Kiowa, Tillman	39 min
Aug 16, 5:54 PM CDT	Special Weather Statement	OUN	Marshall	66 min
Aug 16, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	51 min
Aug 16, 6:33 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson, Tillman	42 min
Aug 16, 4:19 PM CDT	Special Weather Statement	OUN	Foard	26 min
Aug 16, 4:36 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	39 min
Aug 16, 4:43 PM CDT	Special Weather Statement	OUN	Knox	32 min
Aug 16, 5:19 PM CDT	Special Weather Statement	OUN	Foard	26 min
Aug 16, 5:20 PM CDT	Special Weather Statement	OUN	Foard	25 min
Aug 16, 5:43 PM CDT	Severe Thunderstorm Warning	OUN	Foard	47 min
Aug 16, 5:49 PM CDT	Special Weather Statement	OUN	Clay	26 min
Aug 16, 5:59 PM CDT	Areal Flood Advisory	OUN	Foard	3 hr
Aug 16, 6:18 PM CDT	Special Weather Statement	OUN	Wilbarger	27 min
Aug 16, 6:25 PM CDT	Special Weather Statement	OUN	Clay	35 min
Aug 16, 6:37 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	53 min
Aug 16, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Clay	65 min
Aug 16, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Knox, Wilbarger	51 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.