Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 598, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Nov 30, 2018, 5:23 PM CST for Cotton County, Jefferson County, Oklahoma; Clay County, Wichita County, Texas. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 30, 2018, 5:23 PM CST (23:23 UTC)
- Expired
- Nov 30, 2018, 6:15 PM CST
- In force
- 52 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Cotton County, OK, Jefferson County, OK, Clay County, TX, Wichita County, TX
The radar
The Altus AFB radar (KFDR), 73 km from the middle of the area, began a volume at 23:26 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Nov 30, 5:23 PM CST | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 11.4 hours before the alert went out and 154 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1498 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 242 m²/s²
- 0-3 km storm-relative helicity
- 337 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 3:20 AM CST | Dense Fog Advisory | OUN | Alfalfa, Blaine, Canadian, Dewey, Garfield, Grant and 11 more | 7 hr |
| Nov 30, 11:37 AM CST | Dense Fog Advisory | OUN | Alfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 7 more | 2 hr |
| Nov 30, 3:57 PM CST | Dense Fog Advisory | OUN | Alfalfa, Dewey, Ellis, Harper, Major, Woods and 1 more | 3 hr |
| Nov 30, 5:52 PM CST | Special Weather Statement | OUN | Grady | 23 min |
| Nov 30, 5:11 PM CST | Special Weather Statement | OUN | Clay | 34 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2018Severe Thunderstorm Warnings in Texas, 2018Every severe thunderstorm 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.