Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 433, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 27, 2021, 4:15 PM CDT for Johnston County, Marshall County, Oklahoma. It was in force for 15 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
- Jul 27, 2021, 4:15 PM CDT (21:15 UTC)
- Expired
- Jul 27, 2021, 4:30 PM CDT
- In force
- 15 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Johnston County, OK, Marshall County, OK
The radar
The Norman radar (KTLX), 135 km from the middle of the area, began a volume at 21:16 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 12:00Z, 9.3 hours before the alert went out and 128 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
- 1050 J/kg
- Mixed-layer CIN
- -157 J/kg
- Mixed-layer LCL
- 1417 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
121 WUUS54 KOUN 272115 SVROUN OKC069-095-272130- /O.NEW.KOUN.SV.W.0433.210727T2115Z-210727T2130Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Norman OK 415 PM CDT Tue Jul 27 2021 The National Weather Service in Norman has issued a * Severe Thunderstorm Warning for... Southwestern Johnston County in southeastern Oklahoma... North central Marshall County in southeastern Oklahoma... * Until 430 PM CDT. * At 415 PM CDT, a severe thunderstorm was located near Madill, moving south at 10 to 20 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Mannsville and Russett. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3419 9689 3423 9676 3414 9672 3412 9687 TIME...MOT...LOC 2115Z 341DEG 19KT 3413 9679 HAIL...0.88IN WIND...60MPH $$ SIX
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 7:24 PM CDT | Special Weather Statement | OUN | Pontotoc | 36 min |
| Jul 26, 7:53 PM CDT | Special Weather Statement | OUN | Pontotoc | 37 min |
| Jul 27, 7:42 AM CDT | Heat Advisory | OUN | Atoka, Bryan, Coal, Hughes, Johnston, Kay and 7 more | 11 hr |
| Jul 27, 12:33 PM CDT | Heat Advisory | OUN | Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 22 more | 30 hr |
| Jul 27, 3:37 PM CDT | Special Weather Statement | OUN | Bryan | 23 min |
| Jul 27, 3:41 PM CDT | Special Weather Statement | OUN | Pontotoc | 19 min |
| Jul 27, 4:06 PM CDT | Special Weather Statement | OUN | Marshall | 24 min |
| Jul 27, 4:20 PM CDT | Special Weather Statement | OUN | Bryan | 25 min |
| Jul 27, 4:29 PM CDT | Special Weather Statement | OUN | Pontotoc | 31 min |
| Jul 27, 4:37 PM CDT | Special Weather Statement | OUN | Canadian | 23 min |
| Jul 27, 4:39 PM CDT | Special Weather Statement | OUN | Marshall | 36 min |
| Jul 27, 4:45 PM CDT | Special Weather Statement | OUN | Johnston | 30 min |
| Jul 27, 5:11 PM CDT | Special Weather Statement | OUN | Kiowa | 34 min |
| Jul 27, 6:07 PM CDT | Special Weather Statement | OUN | Coal | 23 min |
| Jul 27, 6:22 PM CDT | Special Weather Statement | OUN | Oklahoma | 38 min |
| Jul 27, 6:49 PM CDT | Special Weather Statement | OUN | Seminole | 26 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.