Alert archive / Oklahoma / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 22
The Storm Prediction Center issued this severe thunderstorm watch at Mar 16, 2021, 7:49 PM CDT for Cowley County, Harper County, Sumner County, Kansas; 25 counties in Oklahoma; 7 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 16, 2021, 7:49 PM CDT (00:49 UTC)
- Expired
- Mar 17, 2021, 3:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 35 counties
Cowley County, KS, Harper County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Lipscomb County, TX, Roberts County, TX, Wheeler County, TX
The radar
The Vance AFB radar (KVNX), 132 km from the middle of the area, began a volume at 00:54 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
46 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 16, 8:02 PM CDT | Severe Thunderstorm Warning | AMA | Collingsworth | 33 min |
| Mar 16, 8:19 PM CDT | Severe Thunderstorm Warning | OUN | Beckham | 26 min |
| Mar 16, 8:47 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson | 43 min |
| Mar 16, 8:49 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill, Roberts | 41 min |
| Mar 16, 9:12 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill, Lipscomb | 48 min |
| Mar 16, 9:27 PM CDT | Severe Thunderstorm Warning | AMA | Lipscomb | 63 min |
| Mar 16, 9:29 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Kiowa | 46 min |
| Mar 16, 9:32 PM CDT | Severe Thunderstorm Warning | AMA | Lipscomb | 58 min |
| Mar 16, 9:33 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 42 min |
| Mar 16, 9:43 PM CDT | Severe Thunderstorm Warning | AMA | Carson, Hutchinson, Moore, Ochiltree, Potter, Roberts | 62 min |
| Mar 16, 9:55 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Roger Mills | 35 min |
| Mar 16, 10:06 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Kiowa, Washita | 39 min |
| Mar 16, 10:11 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Woodward | 64 min |
| Mar 16, 10:12 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Jackson, Kiowa | 48 min |
| Mar 16, 10:43 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Caddo, Custer, Washita | 47 min |
| Mar 16, 10:45 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Ellis, Major, Woodward | 60 min |
| Mar 16, 10:56 PM CDT | Severe Thunderstorm Warning | OUN | Kiowa, Washita | 49 min |
| Mar 16, 11:01 PM CDT | Severe Thunderstorm Warning | AMA | Carson, Gray, Hemphill, Hutchinson, Ochiltree, Roberts and 1 more | 59 min |
| Mar 16, 11:08 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill, Lipscomb, Ochiltree, Roberts | 67 min |
| Mar 16, 11:17 PM CDT | Tornado Warning | OUN | Caddo, Kiowa, Washita | 43 min |
| Mar 16, 11:32 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Major, Woods, Woodward | 58 min |
| Mar 16, 11:40 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Washita | 50 min |
| Mar 16, 11:47 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Harper, Roger Mills, Woodward | 58 min |
| Mar 16, 11:53 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson | 52 min |
| Mar 16, 11:53 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill, Lipscomb, Ochiltree, Roberts | 52 min |
| Mar 16, 11:56 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Washita | 49 min |
| Mar 17, 12:09 AM CDT | Severe Thunderstorm Warning | OUN | Dewey, Ellis, Roger Mills, Woodward | 51 min |
| Mar 17, 12:18 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 42 min |
| Mar 17, 12:20 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Caddo, Custer, Washita | 40 min |
| Mar 17, 12:32 AM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Kiowa, Washita | 43 min |
| Mar 17, 12:34 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Dewey, Major, Woodward | 56 min |
| Mar 17, 12:42 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Caddo, Canadian | 31 min |
| Mar 17, 12:44 AM CDT | Tornado Warning | OUN | Dewey | 21 min |
| Mar 17, 12:54 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Canadian | 51 min |
| Mar 17, 12:59 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Garfield, Kingfisher, Major | 46 min |
| Mar 17, 1:14 AM CDT | Severe Thunderstorm Warning | OUN | Greer, Kiowa, Washita | 33 min |
| Mar 17, 1:26 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Dewey, Kingfisher, Major | 49 min |
| Mar 17, 1:27 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Noble | 48 min |
| Mar 17, 1:30 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 45 min |
| Mar 17, 1:39 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher, Major | 37 min |
| Mar 17, 1:42 AM CDT | Severe Thunderstorm Warning | OUN | Garfield | 16 min |
| Mar 17, 1:57 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer, Dewey | 33 min |
| Mar 17, 2:11 AM CDT | Severe Thunderstorm Warning | OUN | Kay, Noble | 49 min |
| Mar 17, 2:13 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Kingfisher, Logan | 47 min |
| Mar 17, 2:42 AM CDT | Flash Flood Warning | OUN | Blaine, Kingfisher | 3 hr |
| Mar 17, 2:55 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Grant, Kay, Noble | 65 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 0.8 hours before the alert went out and 196 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
- 626 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1825 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted.
597
WWUS20 KWNS 170046
SEL2
SPC WW 170046
KSZ000-OKZ000-TXZ000-170800-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 22
NWS Storm Prediction Center Norman OK
750 PM CDT Tue Mar 16 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
South Central Kansas
Western and North-Central Oklahoma
Eastern Texas Panhandle
* Effective this Tuesday night and Wednesday morning from 750 PM
until 300 AM CDT.
* Primary threats include...
Widespread large hail and isolated very large hail events to 3
inches in diameter likely
Scattered damaging wind gusts to 70 mph likely
A tornado or two possible
SUMMARY...Thunderstorms are expected to intensify rapidly this
evening along a boundary over northwest Oklahoma and the northeast
Texas Panhandle. Other isolated cells may develop slightly farther
south. Storms will track northeastward across the watch, posing a
risk of very large hail, damaging winds, and perhaps a tornado or
two.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 90 miles west of
Clinton OK to Ponca City OK. For a complete depiction of the watch
see the associated watch outline update (WOUS64 KWNS WOU2).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
24035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 12:45 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 21 more | 90 min |
| Mar 17, 1:54 AM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Bourbon, Butler, Chautauqua, Cherokee and 10 more | 6 hr |
| Mar 17, 4:38 AM CDT | Mesoscale Discussion | SPC | Morton, Stevens | 6 hr |
| Mar 17, 5:18 AM CDT | Mesoscale Discussion | SPC | Bourbon, Cherokee, Crawford, Labette, Linn, Montgomery and 1 more | 87 min |
| Mar 17, 1:18 PM CDT | Mesoscale Discussion | SPC | Cherokee | 57 min |
| Mar 17, 1:32 AM CDT | Mesoscale Discussion | SPC | LeFlore, McCurtain | 118 min |
| Mar 17, 1:56 AM CDT | Mesoscale Discussion | SPC | Blaine, Custer, Garfield, Kay, Kingfisher, Logan and 3 more | 64 min |
| Mar 17, 4:04 AM CDT | Mesoscale Discussion | SPC | Bryan, Choctaw, McCurtain | 86 min |
| Mar 17, 4:37 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Choctaw, McCurtain, Pushmataha | 5 hr |
| Mar 17, 6:40 AM CDT | Mesoscale Discussion | SPC | Choctaw, Latimer, LeFlore, McCurtain, Pushmataha | 95 min |
| Mar 17, 2:00 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Craig, Creek, Delaware, Mayes and 5 more | 7 hr |
| Mar 17, 3:37 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 5 more | 83 min |
| Mar 16, 9:27 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Coke, Coleman and 30 more | 93 min |
| Mar 16, 10:26 PM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Brown, Callahan, Coke, Coleman and 44 more | 7 hr |
| Mar 17, 2:20 AM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Eastland, Erath and 6 more | 85 min |
| Mar 17, 8:43 AM CDT | Tornado Watch | SPC | Angelina, Nacogdoches, Sabine, San Augustine, Shelby | 4 hr |
| Mar 17, 11:35 AM CDT | Mesoscale Discussion | SPC | Angelina, Brazoria, Chambers, Galveston, Hardin, Harris and 10 more | 85 min |
| Mar 17, 11:53 AM CDT | Tornado Watch | SPC | Hardin, Jasper, Jefferson, Newton, Orange, Tyler | 6 hr |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2021Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in Kansas, 2021Every severe thunderstorm watch 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.