Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 11, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Mar 12, 2021, 8:07 PM CST for Blaine County, Custer County, Kingfisher County, Oklahoma. It was in force for 38 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
- Mar 12, 2021, 8:07 PM CST (02:07 UTC)
- Expired
- Mar 12, 2021, 8:45 PM CST
- In force
- 38 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Blaine County, OK, Custer County, OK, Kingfisher County, OK
The radar
The Norman radar (KTLX), 107 km from the middle of the area, began a volume at 02:09 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, 2.1 hours before the alert went out and 104 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
- 910 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 646 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.2
The text
As transmitted.
587
WUUS54 KOUN 130207
SVROUN
OKC011-039-073-130245-
/O.NEW.KOUN.SV.W.0011.210313T0207Z-210313T0245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
807 PM CST Fri Mar 12 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Southwestern Kingfisher County in central Oklahoma...
Eastern Custer County in western Oklahoma...
Central Blaine County in northwestern Oklahoma...
* Until 845 PM CST.
* At 807 PM CST, a severe thunderstorm was located 6 miles west of
Greenfield, moving northeast at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Watonga, Hitchcock, Greenfield and Omega.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3578 9810 3572 9826 3572 9831 3570 9832
3561 9858 3574 9872 3606 9833
TIME...MOT...LOC 0207Z 235DEG 24KT 3575 9849
HAIL...1.00IN
WIND...<50MPH
$$
JP1 follow-up statement
484
WWUS54 KOUN 130222
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
822 PM CST Fri Mar 12 2021
OKC039-130231-
/O.CAN.KOUN.SV.W.0011.000000T0000Z-210313T0245Z/
Custer OK-
822 PM CST Fri Mar 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CUSTER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3572 9826 3572 9831 3570 9832 3567 9852
3566 9863 3581 9863 3606 9833 3578 9810
TIME...MOT...LOC 0221Z 235DEG 24KT 3580 9839
$$
OKC011-073-130245-
/O.CON.KOUN.SV.W.0011.000000T0000Z-210313T0245Z/
Kingfisher OK-Blaine OK-
822 PM CST Fri Mar 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CST
FOR SOUTHWESTERN KINGFISHER AND CENTRAL BLAINE COUNTIES...
At 821 PM CST, a severe thunderstorm was located near Watonga, moving
northeast at 25 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Watonga, Hitchcock, Greenfield and Omega.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3572 9826 3572 9831 3570 9832 3567 9852
3566 9863 3581 9863 3606 9833 3578 9810
TIME...MOT...LOC 0221Z 235DEG 24KT 3580 9839
HAIL...1.00IN
WIND...<50MPH
$$
JPThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 6:15 PM CST | Areal Flood Advisory | OUN | Alfalfa, Blaine, Dewey, Garfield, Grant, Major | 3 hr |
| Mar 12, 6:18 PM CST | Special Weather Statement | OUN | Custer | 42 min |
| Mar 12, 6:33 PM CST | Special Weather Statement | OUN | Washita | 27 min |
| Mar 12, 6:38 PM CST | Flash Flood Warning | OUN | Alfalfa, Garfield, Grant, Major | 3 hr |
| Mar 12, 6:45 PM CST | Special Weather Statement | OUN | Blaine | 45 min |
| Mar 12, 7:05 PM CST | Special Weather Statement | OUN | Kay | 25 min |
| Mar 12, 7:18 PM CST | Areal Flood Advisory | OUN | Kay, Noble | 3 hr |
| Mar 12, 7:31 PM CST | Special Weather Statement | OUN | Blaine | 29 min |
| Mar 12, 7:35 PM CST | Areal Flood Advisory | OUN | Custer | 3 hr |
| Mar 12, 8:00 PM CST | Special Weather Statement | OUN | Blaine | 30 min |
| Mar 12, 8:40 PM CST | Special Weather Statement | OUN | Noble | 35 min |
| Mar 12, 8:42 PM CST | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 48 min |
| Mar 12, 9:26 PM CST | Severe Thunderstorm Warning | OUN | Kingfisher | 34 min |
| Mar 13, 1:19 AM CST | Special Weather Statement | OUN | Harmon | 26 min |
| Mar 13, 1:41 AM CST | Special Weather Statement | OUN | Harmon | 49 min |
| Mar 13, 2:31 AM CST | Special Weather Statement | OUN | Jackson | 29 min |
| Mar 13, 4:42 AM CST | Dense Fog Advisory | OUN | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 22 more | 7 hr |
| Mar 13, 7:54 AM CST | River Flood Advisory | OUN | Blaine, Canadian | 13 hr |
| Mar 13, 12:02 PM CST | Dense Fog Advisory | OUN | Alfalfa, Harper, Woods | 118 min |
| Mar 13, 2:08 PM CST | River Flood Advisory | OUN | Blaine, Caddo, Canadian, Custer | 39 hr |
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.