Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 475, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 29, 2021, 1:57 PM CDT for 4 counties in Oklahoma. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2021, 1:57 PM CDT (18:57 UTC)
- Expired
- Aug 29, 2021, 2:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Ellis County, OK, Harper County, OK, Woods County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 106 km from the middle of the area, began a volume at 18:59 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
Dodge City, (KDDC), launched 12:00Z, 7.0 hours before the alert went out and 120 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
- 560 J/kg
- Mixed-layer CIN
- -245 J/kg
- Mixed-layer LCL
- 1248 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 338 m²/s²
- 0-3 km storm-relative helicity
- 439 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
466 WUUS54 KOUN 291857 SVROUN OKC045-059-151-153-291945- /O.NEW.KOUN.SV.W.0475.210829T1857Z-210829T1945Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Norman OK 157 PM CDT Sun Aug 29 2021 The National Weather Service in Norman has issued a * Severe Thunderstorm Warning for... Northwestern Ellis County in northwestern Oklahoma... Northwestern Woods County in northwestern Oklahoma... Harper County in northwestern Oklahoma... Northern Woodward County in northwestern Oklahoma... * Until 245 PM CDT. * At 156 PM CDT, severe thunderstorms were located along a line extending from 9 miles northwest of Avard to 4 miles southwest of Laverne, moving south at 10 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Laverne, Buffalo, Waynoka, Fort Supply, Freedom, May, Rosston, Alabaster Caverns State Park, Selman, Catesby and Camp Houston. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with the storms around Buffalo, Rosston, and Laverne and may lead to flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3700 9889 3657 9881 3642 10000 3700 10000 TIME...MOT...LOC 1856Z 016DEG 10KT 3677 9893 3665 9994 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ WR
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 1:11 PM CDT | Special Weather Statement | OUN | Woods | 34 min |
| Aug 29, 1:26 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods, Woodward | 34 min |
| Aug 29, 2:32 PM CDT | Areal Flood Advisory | OUN | Harper | 3 hr |
| Aug 29, 2:47 PM CDT | Special Weather Statement | OUN | Harper, Woods, Woodward | 28 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2021Every severe thunderstorm warning 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.