Alert archive / Oklahoma / Excessive Heat Warnings in 2018
Excessive Heat Warning 2, NWS Norman, OK
NWS Norman, OK issued this excessive heat warning at Jul 20, 2018, 3:45 AM CDT for 38 counties in Oklahoma; 8 counties in Texas. It took effect at Jul 20, 2018, 12:00 PM CDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2018, 3:45 AM CDT (08:45 UTC)
- In effect from
- Jul 20, 2018, 12:00 PM CDT
- Expired
- Jul 20, 2018, 9:00 PM CDT
- In force
- 9 hr
- Issued by
- NWS Norman, OK
All 46 counties
Atoka County, OK, Beckham County, OK, Bryan County, OK, Caddo 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, Greer County, OK, Harmon County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa 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, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Norman radar (KTLX), 80 km from the middle of the area, began a volume at 08:47 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 00:00Z, 8.8 hours before the alert went out and 63 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
- 704 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 2907 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 11:11 PM CDT | Special Weather Statement | OUN | Kay | 34 min |
| Jul 20, 3:45 AM CDT | Heat Advisory | OUN | Atoka, Bryan, Coal, Johnston, Murray, Pontotoc | 32 hr |
| Jul 20, 9:10 AM CDT | Heat Advisory | OUN | Carter, Comanche, Cotton, Greer, Harmon, Jackson and 6 more | 59 hr |
| Jul 20, 3:40 PM CDT | Excessive Heat Warning | OUN | Atoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more | 29 hr |
| Jul 20, 3:40 PM CDT | Heat Advisory | OUN | Bryan, Carter, Cleveland, Grady, Hughes, Jefferson and 6 more | 52 hr |
Nearby
Excessive Heat Warnings in Oklahoma, 2018Excessive Heat Warnings in Texas, 2018Every excessive heat warning in 2018
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.