Alert archive / Oklahoma / Tornado Warnings in 2017

Tornado Warning 95, NWS Norman, OK

October 21, 2017Cleveland County, McClain County, Oklahoma

NWS Norman, OK issued this tornado warning at Oct 21, 2017, 8:37 PM CDT for Cleveland County, McClain County, Oklahoma. It was in force for 23 min. 1 report 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, 8:37 PM CDT (01:37 UTC)
Expired: Oct 21, 2017, 9:00 PM CDT
In force: 23 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Cleveland County, OK, McClain County, OK

The radar

The Norman radar (KTLX), 18 km from the middle of the area, began a volume at 01:38 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, 8:37 PM CDT	TORNADO	3 Nnw Goldsby, OK	TORNADO REPORTED NEAR RIVERWIND. DAMAGE INCLUDES DOWNED POWERLINES, A SHED DESTROYED, A DAMAGED SEMI-TRUCK, AND SEVERAL DOWNED TREES.

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 00:00Z, 1.6 hours before the alert went out and 1 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

426 
WFUS54 KOUN 220137
TOROUN
OKC027-087-220215-
/O.NEW.KOUN.TO.W.0095.171022T0137Z-171022T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
837 PM CDT SAT OCT 21 2017

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Northeastern Cleveland County in central Oklahoma...
  Northern McClain County in central Oklahoma...

* Until 915 PM CDT
    
* At 837 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Goldsby, moving east at 35 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...
  Norman, Newcastle, Noble, Goldsby, Lake Thunderbird and Little Axe.

This includes Interstate 35 between mile markers 104 and 111.
 
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 3516 9754 3522 9754 3534 9728 3526 9720
      3518 9720 3513 9750
TIME...MOT...LOC 0137Z 252DEG 30KT 3519 9748 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

KURTZ

4 follow-up statements

329 
WWUS54 KOUN 220140
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
840 PM CDT SAT OCT 21 2017

OKC027-087-220215-
/O.CON.KOUN.TO.W.0095.000000T0000Z-171022T0215Z/
Cleveland OK-McClain OK-
840 PM CDT SAT OCT 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
NORTHEASTERN CLEVELAND AND WEST CENTRAL MCCLAIN COUNTIES...
    
At 839 PM CDT, a confirmed tornado was located over southwestern
Norman, or near Goldsby, moving east at 35 mph.

HAZARD...Damaging tornado and quarter size hail. 

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...
Norman, Newcastle, Goldsby, Lake Thunderbird and Little Axe. 

This includes Interstate 35 between mile markers 105 and 111.
 
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 3517 9752 3522 9754 3534 9728 3526 9720
      3519 9720 3515 9747
TIME...MOT...LOC 0139Z 251DEG 29KT 3520 9746 

TORNADO...OBSERVED
HAIL...1.00IN

$$

KURTZ

285 
WWUS54 KOUN 220148
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
848 PM CDT SAT OCT 21 2017

OKC087-220157-
/O.CAN.KOUN.TO.W.0095.000000T0000Z-171022T0215Z/
McClain OK-
848 PM CDT SAT OCT 21 2017

...THE TORNADO WARNING FOR WEST CENTRAL MCCLAIN 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 3520 9743 3524 9742 3530 9726 3525 9720
      3519 9720 3516 9741 3517 9742
TIME...MOT...LOC 0147Z 255DEG 29KT 3521 9739 

$$

OKC027-220215-
/O.CON.KOUN.TO.W.0095.000000T0000Z-171022T0215Z/
Cleveland OK-
848 PM CDT SAT OCT 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
NORTHEASTERN CLEVELAND COUNTY...
    
At 847 PM CDT, a severe thunderstorm capable of producing a tornado
was located over southwestern Norman, or 4 miles north of Noble,
moving east at 35 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...
Norman, Lake Thunderbird and Little Axe. 

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 3520 9743 3524 9742 3530 9726 3525 9720
      3519 9720 3516 9741 3517 9742
TIME...MOT...LOC 0147Z 255DEG 29KT 3521 9739 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

KURTZ

197 
WWUS54 KOUN 220153
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
853 PM CDT SAT OCT 21 2017

OKC027-220215-
/O.CON.KOUN.TO.W.0095.000000T0000Z-171022T0215Z/
Cleveland OK-
853 PM CDT SAT OCT 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
NORTHEASTERN CLEVELAND COUNTY...
    
At 853 PM CDT, a severe thunderstorm capable of producing a tornado
was located over southeastern Norman, or 5 miles west of Lake
Thunderbird, moving east at 35 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...
Norman, Lake Thunderbird and Little Axe. 

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 9738 3525 9737 3529 9725 3525 9720
      3519 9720 3517 9735 3518 9737
TIME...MOT...LOC 0153Z 254DEG 30KT 3522 9732 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

KURTZ

575 
WWUS54 KOUN 220200
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
900 PM CDT SAT OCT 21 2017

OKC027-220209-
/O.CAN.KOUN.TO.W.0095.000000T0000Z-171022T0215Z/
Cleveland OK-
900 PM CDT SAT OCT 21 2017

...THE TORNADO WARNING FOR NORTHEASTERN CLEVELAND COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 3521 9738 3525 9737 3529 9725 3525 9720
      3519 9720 3517 9735 3518 9737
TIME...MOT...LOC 0158Z 252DEG 30KT 3524 9725 

$$

KURTZ

The 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, 8:47 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, 9:38 PM CDT	Tornado Warning	OUN	Pottawatomie, Seminole	37 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, 2017 Every tornado warning in 2017 Tornadoes 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.