Alert archive / Oklahoma / Heat Advisories in 2021
Heat Advisory 23, NWS Norman, OK
NWS Norman, OK issued this heat advisory at Aug 31, 2021, 12:04 PM CDT for 28 counties in Oklahoma. It took effect at Sep 1, 2021, 12:00 PM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 31, 2021, 12:04 PM CDT (17:04 UTC)
- In effect from
- Sep 1, 2021, 12:00 PM CDT
- Expired
- Sep 1, 2021, 7:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Norman, OK
All 28 counties
Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal 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, 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
The radar
The Norman radar (KTLX), 25 km from the middle of the area, began a volume at 17:10 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 12:00Z, 5.1 hours before the alert went out and 360 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.
- Mixed-layer CAPE
- 13 J/kg
- Mixed-layer CIN
- -212 J/kg
- Mixed-layer LCL
- 1345 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 31, 6:19 AM CDT, 5 hours 45 minutes earlier.
Area forecast discussion, Aug 31, 6:19 AM CDT, 5 hours 45 minutes before
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</html>Hazardous weather outlook, Aug 31, 12:01 PM CDT, 3 minutes before
Hazardous Weather Outlook National Weather Service Norman OK 1201 PM CDT Tue Aug 31 2021 OKZ004>048-050>052-TXZ083>090-011715- Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield- Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne- Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain- Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson- Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton- Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman- Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay- 1201 PM CDT Tue Aug 31 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Today and Tonight... .Thunderstorms... A few isolated storms may develop in parts of south central and southeast Oklahoma, near the Red River, this afternoon. Brief heavy rain and gusty winds are the main concerns. The potential for any storms is expected to end after sunset. .DAYS TWO THROUGH SEVEN...Wednesday through Monday... .Heat... Triple digit heat indices will be possible for at least parts of the area Wednesday through Friday with the highest and most widespread indices expected Wednesday afternoon when values could reach 105 or higher. A Heat Advisory will be in effect Wednesday afternoon across southeast and portions of central and northern Oklahoma. Take steps to prevent heat related illnesses. .Thunderstorms... Showers and thunderstorms will be possible across portions of northern Oklahoma Thursday and Friday with more widespread low chances over the weekend. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 1:06 PM CDT | Special Weather Statement | OUN | Comanche | 24 min |
| Aug 31, 1:16 PM CDT | Special Weather Statement | OUN | Comanche | 29 min |
Nearby
Heat Advisories in Oklahoma, 2021Every 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.