Alert archive / Texas / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 921, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Oct 21, 2017, 9:49 PM CDT for Archer County, Clay County, Texas. It was in force for 41 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
- Oct 21, 2017, 9:49 PM CDT (02:49 UTC)
- Expired
- Oct 21, 2017, 10:30 PM CDT
- In force
- 41 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Archer County, TX, Clay County, TX
The radar
The Altus AFB radar (KFDR), 110 km from the middle of the area, began a volume at 02:52 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Oct 21, 3:06 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 2.8 hours before the alert went out and 122 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
- 1142 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 1889 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.9
The text
As transmitted.
079
WUUS54 KOUN 220249
SVROUN
TXC009-077-220330-
/O.NEW.KOUN.SV.W.0921.171022T0249Z-171022T0330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
949 PM CDT SAT OCT 21 2017
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Southern Clay County in northern Texas...
Southeastern Archer County in northern Texas...
* Until 1030 PM CDT
* At 949 PM CDT, a severe thunderstorm was located 5 miles south of
Windthorst, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Windthorst, Bellevue, Bluegrove, Vashti, Shannon and Joy.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3352 9855 3391 9799 3388 9798 3350 9798
3346 9811 3347 9842 3340 9842 3340 9844
TIME...MOT...LOC 0249Z 234DEG 35KT 3350 9842
HAIL...1.00IN
WIND...60MPH
$$
..speg.2 follow-up statements
493
WWUS54 KOUN 220319
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
1019 PM CDT SAT OCT 21 2017
TXC009-220324-
/O.CAN.KOUN.SV.W.0921.000000T0000Z-171022T0330Z/
Archer TX-
1019 PM CDT SAT OCT 21 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ARCHER COUNTY IS
CANCELLED...
The storms which prompted the warning have moved into Clay County.
Therefore, the warning has been cancelled for Archer County.
LAT...LON 3391 9799 3388 9798 3350 9798 3346 9811
3347 9842 3366 9835
TIME...MOT...LOC 0314Z 239DEG 50KT 3365 9819 3348 9824
$$
TXC077-220330-
/O.CON.KOUN.SV.W.0921.000000T0000Z-171022T0330Z/
Clay TX-
1019 PM CDT SAT OCT 21 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHERN CLAY COUNTY...
At 1014 PM CDT, severe thunderstorms were located along a line
extending from near Bluegrove to 12 miles west of Newport, moving
northeast at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Bellevue, Bluegrove, Vashti, Shannon and Joy.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3391 9799 3388 9798 3350 9798 3346 9811
3347 9842 3366 9835
TIME...MOT...LOC 0314Z 239DEG 50KT 3365 9819 3348 9824
HAIL...1.00IN
WIND...60MPH
$$
..speg.381
WWUS54 KOUN 220321
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
1021 PM CDT SAT OCT 21 2017
TXC077-220330-
/O.EXP.KOUN.SV.W.0921.000000T0000Z-171022T0330Z/
Clay TX-
1021 PM CDT SAT OCT 21 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CLAY COUNTY WILL
EXPIRE AT 1030 PM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire. However gusty winds
are still possible with these thunderstorms.
LAT...LON 3391 9799 3388 9798 3350 9798 3346 9811
3347 9842 3366 9835
TIME...MOT...LOC 0320Z 234DEG 35KT 3368 9813 3351 9818
$$
KURTZThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 21, 7:09 PM CDT | Severe Thunderstorm Warning | OUN | Wilbarger | 36 min |
| Oct 21, 7:10 PM CDT | Severe Thunderstorm Warning | OUN | Wichita, Wilbarger | 50 min |
| Oct 21, 7:50 PM CDT | Special Weather Statement | OUN | Foard, Knox | 25 min |
| Oct 21, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Clay, Wichita, Wilbarger | 46 min |
| Oct 21, 8:01 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Knox | 29 min |
| Oct 21, 8:10 PM CDT | Severe Thunderstorm Warning | OUN | Knox | 35 min |
| Oct 21, 8:20 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Foard, Knox, Wilbarger | 40 min |
| Oct 21, 8:57 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Knox, Wichita, Wilbarger | 48 min |
| Oct 21, 9:17 PM CDT | Areal Flood Advisory | OUN | Archer, Baylor, Clay, Wichita, Wilbarger | 118 min |
| Oct 21, 9:34 PM CDT | Special Weather Statement | OUN | Clay | 26 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2017Every severe thunderstorm warning in 2017
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.