Alert archive / Oklahoma / Tornado Warnings in 2017
Tornado Warning 96, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Oct 21, 2017, 9:38 PM CDT for Pottawatomie County, Seminole County, Oklahoma. It was in force for 37 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, 9:38 PM CDT (02:38 UTC)
- Expired
- Oct 21, 2017, 10:15 PM CDT
- In force
- 37 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Pottawatomie County, OK, Seminole County, OK
The radar
The Norman radar (KTLX), 48 km from the middle of the area, began a volume at 02:40 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, 9:52 PM CDT | TORNADO | Seminole, OK | AN EF1 TORNADO DEVELOPED IN NORTHWEST SEMINOLE AND MOVED SOUTHEAST THROUGH TOWN. A FEW RESIDENIAL AND BUSINESS BUILDINGS HAD SOME DAMAGE, INCLUDING AT LEAST TWO HOMES PARTIALLY UNROOFED. TREE AND POWER LINE DAMAGE OCCURRED ALONG THE PATH. THE TORNADO HAD A PAT |
| Oct 21, 9:52 PM CDT | TORNADO | Seminole, OK | AN EF1 TORNADO DEVELOPED IN NORTHWEST SEMINOLE AND MOVED SOUTHEAST THROUGH TOWN. A FEW RESIDENIAL AND BUSINESS BUILDINGS HAD SOME DAMAGE, INCLUDING AT LEAST TWO HOMES PARTIALLY UNROOFED. TREE AND POWER LINE DAMAGE OCCURRED ALONG THE PATH. THE TORNADO HAD A PAT |
| Oct 21, 9:53 PM CDT | TSTM WND DMG | Seminole, OK | TREE AND POWERLINE DAMAGE IN SEMINOLE. POSSIBLE TORNADO. |
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, 7:24 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 2.6 hours before the alert went out and 58 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
- 1764 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 974 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 10.8
The text
As transmitted.
238
WFUS54 KOUN 220238
TOROUN
OKC125-133-220315-
/O.NEW.KOUN.TO.W.0096.171022T0238Z-171022T0315Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
938 PM CDT SAT OCT 21 2017
The National Weather Service in Norman has issued a
* Tornado Warning for...
Central Seminole County in east central Oklahoma...
Central Pottawatomie County in central Oklahoma...
* Until 1015 PM CDT
* At 938 PM CDT, a severe thunderstorm capable of producing a tornado
was located 4 miles southeast of Tecumseh, moving east at 40 mph.
HAZARD...Tornado and quarter 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...
Seminole, Tecumseh, Earlsboro and Harjo.
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.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 3516 9692 3521 9693 3525 9692 3536 9659
3529 9653 3519 9651
TIME...MOT...LOC 0238Z 260DEG 33KT 3522 9688
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
KURTZ4 follow-up statements
933
WWUS54 KOUN 220246
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
946 PM CDT SAT OCT 21 2017
OKC125-133-220315-
/O.CON.KOUN.TO.W.0096.000000T0000Z-171022T0315Z/
Seminole OK-Pottawatomie OK-
946 PM CDT SAT OCT 21 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
NORTHWESTERN SEMINOLE AND CENTRAL POTTAWATOMIE COUNTIES...
At 946 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Earlsboro, moving east at 40 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Seminole, Earlsboro and Harjo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a storm shelter, safe room, or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 3519 9682 3523 9684 3528 9684 3536 9659
3529 9653 3524 9652
TIME...MOT...LOC 0246Z 252DEG 36KT 3524 9678
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
KURTZ322
WWUS54 KOUN 220254
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
954 PM CDT SAT OCT 21 2017
OKC125-220304-
/O.CAN.KOUN.TO.W.0096.000000T0000Z-171022T0315Z/
Pottawatomie OK-
954 PM CDT SAT OCT 21 2017
...THE TORNADO WARNING FOR CENTRAL POTTAWATOMIE COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
LAT...LON 3521 9671 3525 9674 3530 9674 3536 9659
3529 9653 3524 9652
TIME...MOT...LOC 0254Z 265DEG 34KT 3525 9669
$$
OKC133-220315-
/O.CON.KOUN.TO.W.0096.000000T0000Z-171022T0315Z/
Seminole OK-
954 PM CDT SAT OCT 21 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
NORTHWESTERN SEMINOLE COUNTY...
At 954 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Seminole, moving east at 40 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Seminole.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a storm shelter, safe room, or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 3521 9671 3525 9674 3530 9674 3536 9659
3529 9653 3524 9652
TIME...MOT...LOC 0254Z 265DEG 34KT 3525 9669
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
KURTZ177
WWUS54 KOUN 220300
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
1000 PM CDT SAT OCT 21 2017
OKC133-220315-
/O.CON.KOUN.TO.W.0096.000000T0000Z-171022T0315Z/
Seminole OK-
1000 PM CDT SAT OCT 21 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR NORTH
CENTRAL SEMINOLE COUNTY...
At 1000 PM CDT, a severe thunderstorm capable of producing a tornado
was located 4 miles northeast of Seminole, moving east at 40 mph.
HAZARD...Tornado.
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.
This tornadic thunderstorm will remain over mainly rural areas of
north central Seminole County.
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.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 3522 9662 3525 9664 3528 9665 3533 9657
3529 9653 3524 9652
TIME...MOT...LOC 0300Z 259DEG 35KT 3526 9661
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
KURTZ531
WWUS54 KOUN 220308
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
1008 PM CDT SAT OCT 21 2017
OKC133-220318-
/O.EXP.KOUN.TO.W.0096.000000T0000Z-171022T0315Z/
Seminole OK-
1008 PM CDT SAT OCT 21 2017
...THE TORNADO WARNING FOR NORTH CENTRAL SEMINOLE COUNTY WILL EXPIRE
AT 1015 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds are still possible with
this thunderstorm.
LAT...LON 3522 9662 3525 9664 3528 9665 3533 9657
3529 9653 3524 9652
TIME...MOT...LOC 0308Z 260DEG 33KT 3527 9654
$$
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 | Jackson, Tillman | 36 min |
| Oct 21, 7:10 PM CDT | Tornado Warning | OUN | Caddo | 35 min |
| Oct 21, 7:13 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Tillman | 47 min |
| Oct 21, 7:22 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Grady | 38 min |
| Oct 21, 7:24 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Grady | 51 min |
| Oct 21, 7:27 PM CDT | Tornado Warning | OUN | Caddo, Grady | 33 min |
| Oct 21, 7:34 PM CDT | Flash Flood Warning | OUN | Caddo | 116 min |
| Oct 21, 7:39 PM CDT | Areal Flood Advisory | OUN | Caddo, Comanche | 2 hr |
| Oct 21, 7:40 PM CDT | Special Weather Statement | OUN | Kay, Kingfisher, Logan, Noble | 35 min |
| Oct 21, 7:53 PM CDT | Areal Flood Advisory | OUN | Caddo, Canadian, Grady, Kingfisher, Logan, Oklahoma and 1 more | 3 hr |
| Oct 21, 7:55 PM CDT | Tornado Warning | OUN | Grady, McClain | 35 min |
| Oct 21, 7:56 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Grady, Oklahoma | 49 min |
| Oct 21, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Tillman | 46 min |
| Oct 21, 8:07 PM CDT | Special Weather Statement | OUN | Payne | 23 min |
| Oct 21, 8:10 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Grady, McClain | 50 min |
| Oct 21, 8:17 PM CDT | Areal Flood Warning | OUN | Caddo, Canadian, Grady | 118 min |
| Oct 21, 8:20 PM CDT | Areal Flood Warning | OUN | Caddo, Canadian, Grady | 115 min |
| Oct 21, 8:33 PM CDT | Special Weather Statement | OUN | Lincoln, Oklahoma, Payne | 27 min |
| Oct 21, 8:33 PM CDT | Severe Thunderstorm Warning | OUN | Grady, Jefferson, Stephens | 42 min |
| Oct 21, 8:36 PM CDT | Areal Flood Advisory | OUN | Lincoln, Logan, Noble, Payne | 114 min |
| Oct 21, 8:37 PM CDT | Tornado Warning | OUN | Cleveland, McClain | 23 min |
| Oct 21, 8:47 PM CDT | Areal Flood Warning | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 3 hr |
| Oct 21, 8:48 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain, Oklahoma | 42 min |
| Oct 21, 8:49 PM CDT | Flash Flood Warning | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 116 min |
| Oct 21, 8:57 PM CDT | Severe Thunderstorm Warning | OUN | Cotton, Tillman | 48 min |
| Oct 21, 9:02 PM CDT | Flash Flood Warning | OUN | Cleveland, Lincoln, Logan, Oklahoma | 118 min |
| Oct 21, 9:04 PM CDT | Special Weather Statement | OUN | Lincoln, Payne | 41 min |
| Oct 21, 9:10 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Garvin, Grady, Stephens | 50 min |
| Oct 21, 9:17 PM CDT | Areal Flood Advisory | OUN | Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 10 more | 118 min |
| Oct 21, 9:19 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole | 41 min |
| Oct 21, 9:34 PM CDT | Special Weather Statement | OUN | Jefferson | 26 min |
| Oct 21, 9:52 PM CDT | Severe Thunderstorm Warning | OUN | Hughes, Lincoln, Pottawatomie, Seminole | 38 min |
| Oct 21, 9:55 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Pontotoc, Seminole | 50 min |
| Oct 21, 10:10 PM CDT | Tornado Warning | OUN | Pontotoc | 22 min |
| Oct 21, 10:39 PM CDT | Special Weather Statement | OUN | Carter, Johnston, Love, Marshall, Murray | 36 min |
| Oct 21, 10:47 PM CDT | Special Weather Statement | OUN | Coal, Hughes | 28 min |
| Oct 21, 10:52 PM CDT | Areal Flood Advisory | OUN | Coal, Garvin, Hughes, Murray, Pontotoc, Seminole | 53 min |
| Oct 21, 11:47 PM CDT | Special Weather Statement | OUN | Bryan | 28 min |
| Oct 21, 11:48 PM CDT | Special Weather Statement | OUN | Atoka | 27 min |
| Oct 22, 9:53 AM CDT | River Flood Warning | OUN | Comanche, Cotton | 56 hr |
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.