Alert archive / Oklahoma / Heat Advisories in 2021

Heat Advisory 11, NWS Norman, OK

July 30, 202131 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas

NWS Norman, OK issued this heat advisory at Jul 30, 2021, 3:19 AM CDT for 31 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas. It took effect at Jul 31, 2021, 11:00 AM CDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Jul 30, 2021, 3:19 AM CDT (08:19 UTC)
In effect from: Jul 31, 2021, 11:00 AM CDT
Expired: Jul 31, 2021, 9:00 PM CDT
In force: 10 hr
Issued by: NWS Norman, OK

All 34 counties

Alfalfa County, OK, Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal 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), 31 km from the middle of the area, began a volume at 08:22 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, 8.3 hours before the alert went out and 249 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: 1363 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1966 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 13 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 Jul 29, 11:24 PM CDT, 3 hours 55 minutes earlier.

Area forecast discussion, Jul 29, 11:24 PM CDT, 3 hours 55 minutes before

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Hazardous weather outlook, Jul 29, 7:57 PM CDT, 7 hours 22 minutes before

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Nearby

Heat Advisories in Oklahoma, 2021 Heat Advisories in Texas, 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.