Alert archive / Oklahoma / Heat Advisories in 2025

Heat Advisory 21, NWS Norman, OK

August 18, 202532 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas

NWS Norman, OK issued this heat advisory at Aug 18, 2025, 12:18 PM CDT for 32 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas. It took effect at Aug 19, 2025, 12:00 PM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Aug 18, 2025, 12:18 PM CDT (17:18 UTC)
In effect from: Aug 19, 2025, 12:00 PM CDT
Expired: Aug 19, 2025, 8:00 PM CDT
In force: 8 hr
Issued by: NWS Norman, OK

All 35 counties

Alfalfa County, OK, Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Archer County, TX, Clay County, TX, Wichita County, TX

The radar

The Norman radar (KTLX), 33 km from the middle of the area, began a volume at 17:20 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

Norman, OK (KOUN), launched 12:00Z, 5.3 hours before the alert went out and 18 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: 1097 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 97 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 18, 12:04 PM CDT, 14 minutes earlier.

Area forecast discussion, Aug 18, 12:04 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 17, 7:05 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Harper, Woods	25 min
Aug 17, 7:10 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	50 min
Aug 17, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	46 min
Aug 17, 7:46 PM CDT	Special Weather Statement	OUN	Dewey	29 min
Aug 17, 7:56 PM CDT	Areal Flood Advisory	OUN	Custer, Dewey, Roger Mills	3 hr
Aug 17, 7:59 PM CDT	Special Weather Statement	OUN	Custer, Dewey	46 min
Aug 17, 8:15 PM CDT	Special Weather Statement	OUN	Woods	30 min
Aug 17, 8:26 PM CDT	Special Weather Statement	OUN	Woodward	34 min
Aug 17, 8:33 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	15 min
Aug 17, 8:40 PM CDT	Special Weather Statement	OUN	Harper	35 min
Aug 17, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	29 min
Aug 17, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Woods	49 min
Aug 18, 2:40 PM CDT	Special Weather Statement	OUN	Beckham	35 min
Aug 18, 3:16 PM CDT	Special Weather Statement	OUN	Roger Mills	29 min
Aug 18, 3:22 PM CDT	Special Weather Statement	OUN	Major	23 min
Aug 18, 3:28 PM CDT	Special Weather Statement	OUN	Harper	32 min
Aug 18, 3:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Harper	45 min
Aug 18, 4:09 PM CDT	Special Weather Statement	OUN	Garfield	36 min
Aug 18, 4:10 PM CDT	Special Weather Statement	OUN	Woods	35 min
Aug 18, 4:11 PM CDT	Special Weather Statement	OUN	Grant	34 min
Aug 18, 4:31 PM CDT	Special Weather Statement	OUN	Harper	29 min
Aug 18, 4:32 PM CDT	Special Weather Statement	OUN	Alfalfa	28 min
Aug 18, 4:38 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	37 min
Aug 18, 4:47 PM CDT	Special Weather Statement	OUN	Grant	28 min
Aug 18, 5:03 PM CDT	Special Weather Statement	OUN	Harper	27 min
Aug 18, 5:04 PM CDT	Special Weather Statement	OUN	Ellis	26 min
Aug 18, 5:13 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	47 min
Aug 18, 5:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis, Harper, Roger Mills	42 min
Aug 18, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	31 min
Aug 18, 5:42 PM CDT	Special Weather Statement	OUN	Woods	33 min
Aug 18, 5:48 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis, Harper, Woodward	42 min
Aug 18, 5:56 PM CDT	Areal Flood Advisory	OUN	Ellis, Harper	3 hr
Aug 18, 6:00 PM CDT	Special Weather Statement	OUN	Alfalfa, Garfield	30 min
Aug 18, 6:04 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Major	26 min
Aug 18, 6:07 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	38 min
Aug 18, 6:13 PM CDT	Areal Flood Advisory	OUN	Garfield, Grant	3 hr
Aug 18, 6:27 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Major	48 min
Aug 18, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	48 min
Aug 18, 6:43 PM CDT	Special Weather Statement	OUN	Dewey	32 min
Aug 18, 6:44 PM CDT	Special Weather Statement	OUN	Major	31 min
Aug 18, 6:44 PM CDT	Special Weather Statement	OUN	Kingfisher	31 min
Aug 18, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Major	19 min

Nearby

Heat Advisories in Oklahoma, 2025 Heat Advisories in Texas, 2025 Every heat advisory in 2025

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.