Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 649, NWS Norman, OK

August 11, 2020Atoka County, Coal County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 11, 2020, 4:37 PM CDT for Atoka County, Coal County, Oklahoma. It was in force for 38 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 11, 2020, 4:37 PM CDT (21:37 UTC)
Expired: Aug 11, 2020, 5:15 PM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Atoka County, OK, Coal County, OK

The radar

The Norman radar (KTLX), 139 km from the middle of the area, began a volume at 21:38 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

Fort Worth, TX (KFWD), launched 12:00Z, 9.6 hours before the alert went out and 211 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: 1481 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 1221 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 Aug 11, 2:58 PM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, Aug 11, 2:58 PM CDT, 1 hour 39 minutes before

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Hazardous weather outlook, Aug 11, 3:12 PM CDT, 1 hour 25 minutes before

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In the hours before

Special weather statement, Aug 11, 3:34 PM CDT, 1 hour 3 minutes before

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Special weather statement, Aug 11, 3:36 PM CDT, 1 hour 1 minute before

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Special weather statement, Aug 11, 3:57 PM CDT, 40 minutes before

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Special weather statement, Aug 11, 4:21 PM CDT, 16 minutes before

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Special weather statement, Aug 11, 4:23 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
Aug 10, 7:12 PM CDT	Special Weather Statement	OUN	Woods	33 min
Aug 10, 7:14 PM CDT	Special Weather Statement	OUN	Harper	31 min
Aug 10, 7:16 PM CDT	Areal Flood Advisory	OUN	Harper	3 hr
Aug 10, 7:30 PM CDT	Areal Flood Advisory	OUN	Harper	3 hr
Aug 10, 7:37 PM CDT	Special Weather Statement	OUN	Harper	38 min
Aug 10, 7:38 PM CDT	Special Weather Statement	OUN	Woods	52 min
Aug 10, 7:47 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	43 min
Aug 10, 7:57 PM CDT	Special Weather Statement	OUN	Ellis	33 min
Aug 10, 8:09 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	51 min
Aug 10, 8:30 PM CDT	Special Weather Statement	OUN	Alfalfa, Grant	45 min
Aug 10, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	61 min
Aug 10, 8:54 PM CDT	Tornado Warning	OUN	Woodward	9 min
Aug 10, 9:25 PM CDT	Special Weather Statement	OUN	Garfield	35 min
Aug 10, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey, Major, Woodward	46 min
Aug 10, 9:33 PM CDT	Special Weather Statement	OUN	Greer, Harmon	27 min
Aug 10, 9:38 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Greer, Harmon, Jackson, Kiowa and 2 more	52 min
Aug 10, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa, Washita	41 min
Aug 10, 10:16 PM CDT	Special Weather Statement	OUN	Blaine, Custer, Kingfisher	44 min
Aug 10, 10:36 PM CDT	Special Weather Statement	OUN	Dewey	39 min
Aug 10, 10:40 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Jackson, Kiowa, Tillman and 1 more	50 min
Aug 10, 10:44 PM CDT	Special Weather Statement	OUN	Canadian, Kingfisher, Logan	46 min
Aug 10, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	49 min
Aug 10, 11:21 PM CDT	Special Weather Statement	OUN	Garfield, Grant, Kay, Noble, Payne	69 min
Aug 10, 11:24 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Grady, Stephens, Tillman	51 min
Aug 10, 11:34 PM CDT	Special Weather Statement	OUN	Cleveland, Lincoln, McClain, Oklahoma, Pottawatomie	56 min
Aug 10, 11:46 PM CDT	Special Weather Statement	OUN	Canadian, Logan	59 min
Aug 11, 12:00 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Kingfisher, Logan, McClain and 1 more	50 min
Aug 11, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Garvin, Grady, Jefferson, McClain and 1 more	51 min
Aug 11, 12:21 AM CDT	Special Weather Statement	OUN	Kay, Noble	39 min
Aug 11, 12:23 AM CDT	Special Weather Statement	OUN	Greer, Kiowa	82 min
Aug 11, 12:29 AM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Grady, Kingfisher, Logan, McClain and 1 more	3 hr
Aug 11, 12:36 AM CDT	Special Weather Statement	OUN	Cleveland, McClain, Pottawatomie, Seminole	54 min
Aug 11, 12:44 AM CDT	Special Weather Statement	OUN	Lincoln, Payne	61 min
Aug 11, 1:02 AM CDT	Special Weather Statement	OUN	Cotton, Garvin, Jefferson, Stephens	43 min
Aug 11, 1:29 AM CDT	Special Weather Statement	OUN	Grady	46 min
Aug 11, 2:04 AM CDT	Special Weather Statement	OUN	Comanche	41 min
Aug 11, 3:24 AM CDT	Special Weather Statement	OUN	Garvin	36 min
Aug 11, 4:35 AM CDT	Special Weather Statement	OUN	Pontotoc	25 min
Aug 11, 3:34 PM CDT	Special Weather Statement	OUN	Coal	41 min
Aug 11, 3:36 PM CDT	Special Weather Statement	OUN	Coal	39 min
Aug 11, 3:47 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	43 min
Aug 11, 3:57 PM CDT	Special Weather Statement	OUN	Hughes	33 min
Aug 11, 4:04 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	41 min
Aug 11, 4:21 PM CDT	Special Weather Statement	OUN	Coal	39 min
Aug 11, 4:23 PM CDT	Special Weather Statement	OUN	Coal	52 min
Aug 11, 5:15 PM CDT	Special Weather Statement	OUN	Atoka	30 min
Aug 11, 5:46 PM CDT	Special Weather Statement	OUN	Atoka	29 min
Aug 11, 5:53 PM CDT	Areal Flood Advisory	OUN	Atoka	3 hr
Aug 11, 6:17 PM CDT	Special Weather Statement	OUN	Bryan	43 min
Aug 11, 6:24 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	36 min
Aug 11, 6:32 PM CDT	Special Weather Statement	OUN	Bryan	28 min
Aug 11, 6:53 PM CDT	Special Weather Statement	OUN	Atoka	52 min
Aug 11, 1:07 AM CDT	Special Weather Statement	OUN	Baylor, Foard, Knox	53 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.