Alert archive / Oklahoma / Heat Advisories in 2021

Heat Advisory 17, NWS Norman, OK

August 21, 202124 counties in Oklahoma

NWS Norman, OK issued this heat advisory at Aug 21, 2021, 2:36 AM CDT for 24 counties in Oklahoma. It took effect at Aug 21, 2021, 12:00 PM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Aug 21, 2021, 2:36 AM CDT (07:36 UTC)
In effect from: Aug 21, 2021, 12:00 PM CDT
Expired: Aug 21, 2021, 8:00 PM CDT
In force: 8 hr
Issued by: NWS Norman, OK

All 24 counties

Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 52 km from the middle of the area, began a volume at 07:36 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

Springfield, MO (KSGF), launched 00:00Z, 7.6 hours before the alert went out and 372 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: 2926 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 101 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 heat advisory 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 heat advisory went out at Aug 21, 2:31 AM CDT, 5 minutes earlier.

Area forecast discussion, Aug 21, 2:31 AM CDT, 5 minutes before

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

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In the hours before

Special weather statement, Aug 21, 1:00 AM CDT, 1 hour 36 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, 1:00 AM CDT	Special Weather Statement	OUN	Grant	30 min
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

Heat Advisories in Oklahoma, 2021 Every heat advisory 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.