Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 616, NWS Norman, OK

July 31, 2020Comanche County, Cotton County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 31, 2020, 12:39 AM CDT for Comanche County, Cotton 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: Jul 31, 2020, 12:39 AM CDT (05:39 UTC)
Expired: Jul 31, 2020, 1:30 AM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Comanche County, OK, Cotton County, OK

The radar

The Altus AFB radar (KFDR), 52 km from the middle of the area, began a volume at 05:43 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 00:00Z, 5.7 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: 1104 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 2261 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.8

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 Jul 30, 10:40 PM CDT, 1 hour 59 minutes earlier.

Area forecast discussion, Jul 30, 10:40 PM CDT, 1 hour 59 minutes before

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Hazardous weather outlook, Jul 30, 10:27 PM CDT, 2 hours 12 minutes before

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In the hours before

Local storm report, Jul 30, 8:20 PM CDT, 4 hours 19 minutes before

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Local storm report, Jul 30, 8:25 PM CDT, 4 hours 14 minutes before

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Local storm report, Jul 30, 9:11 PM CDT, 3 hours 28 minutes before

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Local storm report, Jul 30, 10:44 PM CDT, 1 hour 55 minutes before

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Special weather statement, Jul 30, 11:33 PM CDT, 1 hour 6 minutes before

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Special weather statement, Jul 31, 12:16 AM CDT, 23 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
Jul 30, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Carter, Coal, Johnston, Marshall, Murray and 1 more	39 min
Jul 30, 7:10 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens, Tillman	50 min
Jul 30, 7:24 PM CDT	Flash Flood Warning	OUN	Coal, Hughes, Pontotoc	3 hr
Jul 30, 7:37 PM CDT	Areal Flood Advisory	OUN	Pontotoc	3 hr
Jul 30, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Carter, Coal, Hughes, Johnston and 3 more	53 min
Jul 30, 7:39 PM CDT	Flash Flood Warning	OUN	Atoka	3 hr
Jul 30, 7:44 PM CDT	Areal Flood Advisory	OUN	Stephens	3 hr
Jul 30, 7:53 PM CDT	Areal Flood Advisory	OUN	Cotton	3 hr
Jul 30, 7:59 PM CDT	River Flood Warning	OUN	Grant, Kay, Noble	18 hr
Jul 30, 8:08 PM CDT	Special Weather Statement	OUN	Jefferson	52 min
Jul 30, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	50 min
Jul 30, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	28 min
Jul 30, 11:33 PM CDT	Special Weather Statement	OUN	Comanche, Cotton	42 min
Jul 31, 12:16 AM CDT	Special Weather Statement	OUN	Comanche, Cotton	44 min
Jul 31, 1:26 AM CDT	Special Weather Statement	OUN	Cotton	49 min
Jul 31, 2:48 AM CDT	Special Weather Statement	OUN	Carter	27 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.