Alert archive / Oklahoma / Tornado Warnings in 2017
Tornado Warning 91, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Oct 21, 2017, 6:09 PM CDT for Caddo County, Comanche County, Oklahoma. It was in force for 36 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Oct 21, 2017, 6:09 PM CDT (23:09 UTC)
- Expired
- Oct 21, 2017, 6:45 PM CDT
- In force
- 36 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 2.0 in
Counties Caddo County, OK, Comanche County, OK
The radar
The Altus AFB radar (KFDR), 56 km from the middle of the area, began a volume at 23:10 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Oct 21, 6:10 PM CDT | TSTM WND DMG | 2 W Cache, OK | POWERPOLES PARTIALLY DOWN. TIME ESTIMATED BY RADAR. |
| Oct 21, 6:19 PM CDT | TSTM WND DMG | 2 W Cache, OK | POWERPOLES PARTIALLY DOWN. |
| Oct 21, 6:20 PM CDT | HAIL 0.88 | Lake Lawtonka, OK |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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
Norman, OK (KOUN), launched 12:00Z, 11.2 hours before the alert went out and 118 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
- 725 J/kg
- Mixed-layer CIN
- -149 J/kg
- Mixed-layer LCL
- 642 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 231 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted.
399
WFUS54 KOUN 212309
TOROUN
OKC015-031-212345-
/O.NEW.KOUN.TO.W.0091.171021T2309Z-171021T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
609 PM CDT SAT OCT 21 2017
The National Weather Service in Norman has issued a
* Tornado Warning for...
Northwestern Comanche County in southwestern Oklahoma...
Southwestern Caddo County in southwestern Oklahoma...
* Until 645 PM CDT
* At 609 PM CDT, a confirmed tornado was located over southwestern
Fort Sill, moving northeast at 35 mph.
HAZARD...Damaging tornado and hail up to two inches in diameter.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* Locations impacted include...
Cache, Medicine Park, Meers, Lake Lawtonka, southwestern Lake
Ellsworth, Fort Sill and Wichita Mountains Wildlife Refuge.
This includes Interstate 44 between mile markers 45 and 51.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
storm shelter, safe room or an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.
&&
LAT...LON 3458 9865 3470 9874 3489 9851 3484 9839
3474 9832
TIME...MOT...LOC 2309Z 226DEG 30KT 3465 9864
TORNADO...OBSERVED
HAIL...2.00IN
$$
KURTZ3 follow-up statements
213
WWUS54 KOUN 212318
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
618 PM CDT SAT OCT 21 2017
OKC015-031-212345-
/O.CON.KOUN.TO.W.0091.000000T0000Z-171021T2345Z/
Comanche OK-Caddo OK-
618 PM CDT SAT OCT 21 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
NORTHWESTERN COMANCHE AND SOUTHWESTERN CADDO COUNTIES...
At 618 PM CDT, a severe thunderstorm capable of producing a tornado
was located over western Fort Sill, moving northeast at 35 mph.
HAZARD...Tornado and baseball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Medicine Park, Lake Lawtonka, Meers, southwestern Lake Ellsworth,
Fort Sill and Wichita Mountains Wildlife Refuge.
This includes Interstate 44 between mile markers 46 and 51.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a storm shelter, safe room, or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.
&&
LAT...LON 3464 9857 3466 9864 3474 9870 3489 9851
3484 9839 3475 9833
TIME...MOT...LOC 2318Z 226DEG 30KT 3470 9857
TORNADO...RADAR INDICATED
HAIL...2.75IN
$$
KURTZ684
WWUS54 KOUN 212335
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
635 PM CDT SAT OCT 21 2017
OKC015-031-212345-
/O.CON.KOUN.TO.W.0091.000000T0000Z-171021T2345Z/
Comanche OK-Caddo OK-
635 PM CDT SAT OCT 21 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR NORTH
CENTRAL COMANCHE AND SOUTHWESTERN CADDO COUNTIES...
At 635 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Lake Lawtonka, moving northeast at 25 mph.
HAZARD...Tornado and baseball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Medicine Park, Lake Lawtonka, Meers, southwestern Lake Ellsworth,
Fort Sill and eastern Wichita Mountains Wildlife Refuge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a storm shelter, safe room, or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.
&&
LAT...LON 3469 9852 3473 9861 3480 9862 3489 9851
3484 9839 3478 9835
TIME...MOT...LOC 2335Z 227DEG 23KT 3477 9848
TORNADO...RADAR INDICATED
HAIL...2.75IN
$$
KURTZ802
WWUS54 KOUN 212343
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
643 PM CDT SAT OCT 21 2017
OKC015-031-212352-
/O.EXP.KOUN.TO.W.0091.000000T0000Z-171021T2345Z/
Comanche OK-Caddo OK-
643 PM CDT SAT OCT 21 2017
...THE TORNADO WARNING FOR NORTH CENTRAL COMANCHE AND SOUTHWESTERN
CADDO COUNTIES WILL EXPIRE AT 645 PM CDT...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area. However
small hail is still possible with this thunderstorm.
Remember, a Severe Thunderstorm Warning still remains in effect for
Comanche county.
LAT...LON 3469 9852 3473 9861 3480 9862 3489 9851
3484 9839 3478 9835
TIME...MOT...LOC 2342Z 226DEG 30KT 3481 9843
$$
KURTZThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 21, 3:28 PM CDT | Special Weather Statement | OUN | Tillman | 32 min |
| Oct 21, 3:37 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Jackson, Kiowa, Tillman | 53 min |
| Oct 21, 4:04 PM CDT | Special Weather Statement | OUN | Roger Mills | 26 min |
| Oct 21, 4:05 PM CDT | Special Weather Statement | OUN | Custer | 40 min |
| Oct 21, 4:06 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 39 min |
| Oct 21, 4:08 PM CDT | Severe Thunderstorm Warning | OUN | Kiowa, Washita | 52 min |
| Oct 21, 4:21 PM CDT | Special Weather Statement | OUN | Beckham | 24 min |
| Oct 21, 4:25 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Dewey | 50 min |
| Oct 21, 4:29 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 46 min |
| Oct 21, 4:31 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Ellis, Roger Mills | 44 min |
| Oct 21, 4:42 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Jackson, Kiowa, Tillman | 48 min |
| Oct 21, 4:45 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Caddo, Canadian, Custer, Kiowa, Washita | 45 min |
| Oct 21, 4:48 PM CDT | Special Weather Statement | OUN | Roger Mills | 27 min |
| Oct 21, 5:09 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 37 min |
| Oct 21, 5:13 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Garfield, Grant, Major | 47 min |
| Oct 21, 5:18 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Jackson, Kiowa, Washita | 42 min |
| Oct 21, 5:24 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa, Tillman | 51 min |
| Oct 21, 5:27 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 48 min |
| Oct 21, 5:28 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer, Dewey | 47 min |
| Oct 21, 5:30 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Washita | 45 min |
| Oct 21, 5:37 PM CDT | Special Weather Statement | OUN | Major | 38 min |
| Oct 21, 5:44 PM CDT | Tornado Warning | OUN | Comanche, Tillman | 31 min |
| Oct 21, 5:49 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 41 min |
| Oct 21, 5:54 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa, Washita | 51 min |
| Oct 21, 6:09 PM CDT | Special Weather Statement | OUN | Garfield, Grant | 36 min |
| Oct 21, 6:25 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Kiowa, Tillman | 50 min |
| Oct 21, 6:29 PM CDT | Areal Flood Advisory | OUN | Caddo, Comanche, Kiowa, Tillman | 3 hr |
| Oct 21, 6:33 PM CDT | Special Weather Statement | OUN | Blaine | 27 min |
| Oct 21, 6:41 PM CDT | Special Weather Statement | OUN | Kay, Noble | 34 min |
| Oct 21, 6:41 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Grady | 49 min |
| Oct 21, 6:43 PM CDT | Areal Flood Advisory | OUN | Garfield, Grant, Kay, Noble | 3 hr |
| Oct 21, 6:50 PM CDT | Flash Flood Warning | OUN | Comanche | 3 hr |
| Oct 21, 6:55 PM CDT | Special Weather Statement | OUN | Kingfisher | 35 min |
| Oct 21, 6:57 PM CDT | Severe Thunderstorm Warning | OUN | Kay, Noble | 48 min |
Nearby
Tornado Warnings in Oklahoma, 2017Every tornado warning in 2017Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.