Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

August 21, 2021Grant County, Oklahoma

NWS Norman, OK issued this special weather statement at Aug 21, 2021, 1:00 AM CDT for Grant County, Oklahoma. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 21, 2021, 1:00 AM CDT (06:00 UTC)
Expired: Aug 21, 2021, 1:30 AM CDT
In force: 30 min
Issued by: NWS Norman, OK
Hail: 0.00 in
Wind: 40

County Grant County, OK

The radar

The Vance AFB radar (KVNX), 36 km from the middle of the area, began a volume at 06:00 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

Dodge City, (KDDC), launched 00:00Z, 6.0 hours before the alert went out and 216 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: 1329 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 2100 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 20, 10:58 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Aug 20, 10:58 PM CDT, 2 hours 2 minutes before

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Hazardous weather outlook, Aug 20, 7:31 PM CDT, 5 hours 29 minutes before

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In the hours before

Special weather statement, Aug 21, 1:00 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
Aug 21, 2:36 AM CDT	Heat Advisory	OUN	Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 18 more	17 hr
Aug 21, 1:38 PM CDT	Heat Advisory	OUN	Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 22 more	30 hr
Aug 21, 3:32 PM CDT	Special Weather Statement	OUN	Jackson	28 min
Aug 21, 3:40 PM CDT	Special Weather Statement	OUN	Ellis	35 min
Aug 21, 3:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis	38 min
Aug 21, 4:01 PM CDT	Special Weather Statement	OUN	Dewey	29 min
Aug 21, 4:11 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Dewey	49 min
Aug 21, 4:32 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis, Woodward	43 min
Aug 21, 5:05 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Dewey, Major, Woodward	40 min
Aug 21, 5:19 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey	41 min
Aug 21, 5:22 PM CDT	Special Weather Statement	OUN	Kingfisher	23 min
Aug 21, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	46 min
Aug 21, 5:31 PM CDT	Special Weather Statement	OUN	Roger Mills	29 min
Aug 21, 5:35 PM CDT	Areal Flood Advisory	OUN	Dewey	3 hr
Aug 21, 5:43 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	47 min
Aug 21, 6:03 PM CDT	Special Weather Statement	OUN	Custer	27 min
Aug 21, 6:10 PM CDT	Special Weather Statement	OUN	Blaine	35 min
Aug 21, 6:14 PM CDT	Special Weather Statement	OUN	Dewey	31 min
Aug 21, 6:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Kingfisher	23 min
Aug 21, 6:21 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	39 min
Aug 21, 6:25 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	50 min
Aug 21, 6:33 PM CDT	Areal Flood Advisory	OUN	Dewey, Ellis, Roger Mills	3 hr
Aug 21, 6:56 PM CDT	Special Weather Statement	OUN	Kingfisher	34 min

Nearby

Special Weather Statements in Oklahoma, 2021 Every special weather statement in 2021

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.