Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 263
The Storm Prediction Center issued this severe thunderstorm watch at Jun 12, 2021, 9:39 PM CDT for Cimarron County, Texas County, Oklahoma; 27 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2021, 9:39 PM CDT (02:39 UTC)
- Expired
- Jun 13, 2021, 4:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 70 kt
All 29 counties
Cimarron County, OK, Texas County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Collingsworth County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lamb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Swisher County, TX, Wheeler County, TX
The radar
The Amarillo radar (KAMA), 56 km from the middle of the area, began a volume at 02:42 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 10:02 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Oldham | 73 min |
| Jun 12, 10:32 PM CDT | Severe Thunderstorm Warning | AMA | Cimarron, Texas | 58 min |
| Jun 12, 11:01 PM CDT | Severe Thunderstorm Warning | AMA | Cimarron, Texas | 74 min |
| Jun 12, 11:07 PM CDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Hartley, Oldham | 83 min |
| Jun 12, 11:46 PM CDT | Severe Thunderstorm Warning | AMA | Dallam, Hansford, Hartley, Hutchinson, Moore, Oldham and 2 more | 59 min |
| Jun 13, 12:42 AM CDT | Severe Thunderstorm Warning | AMA | Carson, Hansford, Hartley, Hutchinson, Moore, Ochiltree and 4 more | 63 min |
| Jun 13, 1:15 AM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Gray, Hutchinson, Potter, Randall and 1 more | 45 min |
| Jun 13, 1:56 AM CDT | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Donley, Gray, Hemphill, Hutchinson and 3 more | 64 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 2.7 hours before the alert went out and 56 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
- 3697 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1361 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 18.7
The text
As transmitted.
833
WWUS20 KWNS 130237
SEL3
SPC WW 130237
OKZ000-TXZ000-130800-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 263
NWS Storm Prediction Center Norman OK
940 PM CDT Sat Jun 12 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Oklahoma Panhandle
Texas Panhandle
* Effective this Saturday night and Sunday morning from 940 PM
until 300 AM CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 80
mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Storms moving off the higher terrain will pose a risk for
damaging wind and large hail as they continue east through the
Oklahoma and Texas Panhandles this evening.
The severe thunderstorm watch area is approximately along and 55
statute miles east and west of a line from 40 miles northwest of
Guymon OK to 35 miles south southwest of Plainview TX. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU3).
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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 262...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29035.
...DialSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 9:23 PM CDT | Mesoscale Discussion | SPC | Cimarron | 67 min |
| Jun 12, 11:33 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 87 min |
| Jun 13, 12:53 AM CDT | Mesoscale Discussion | SPC | Harmon, Roger Mills, Texas | 97 min |
| Jun 13, 6:31 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Comanche, Cotton and 9 more | 119 min |
Nearby
Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in Oklahoma, 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.