Alert archive / Oklahoma / Tornado Warnings in 2017

Tornado Warning 97, NWS Norman, OK

October 21, 2017Pontotoc County, Oklahoma

NWS Norman, OK issued this tornado warning at Oct 21, 2017, 10:10 PM CDT for Pontotoc County, Oklahoma. It was in force for 22 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, 10:10 PM CDT (03:10 UTC)
Expired: Oct 21, 2017, 10:32 PM CDT
In force: 22 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated

County Pontotoc County, OK

The radar

The Norman radar (KTLX), 82 km from the middle of the area, began a volume at 03:13 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, 7:24 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.2 hours before the alert went out and 82 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.

225 
WFUS54 KOUN 220310
TOROUN
OKC123-220345-
/O.NEW.KOUN.TO.W.0097.171022T0310Z-171022T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
1010 PM CDT SAT OCT 21 2017

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Central Pontotoc County in east central Oklahoma...

* Until 1045 PM CDT
    
* At 1010 PM CDT, a severe thunderstorm capable of producing a
  tornado was located 4 miles southwest of Ada, moving northeast at
  50 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. 

* Locations impacted include...
  Ada, Byng and Francis. 

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 3470 9677 3476 9682 3489 9667 3487 9655
      3478 9646
TIME...MOT...LOC 0310Z 227DEG 43KT 3475 9675 

TORNADO...RADAR INDICATED
HAIL...<.75

$$

..speg.

1 follow-up statement

610 
WWUS54 KOUN 220332
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1032 PM CDT SAT OCT 21 2017

OKC123-220341-
/O.CAN.KOUN.TO.W.0097.000000T0000Z-171022T0345Z/
Pontotoc OK-
1032 PM CDT SAT OCT 21 2017

...THE TORNADO WARNING FOR CENTRAL PONTOTOC COUNTY IS CANCELLED...
                
The storm which prompted the warning no longer appears capable of 
producing a tornado, therefore the warning has been cancelled for 
Pontotoc County. However gusty winds are still possible with these 
thunderstorm and a severe thunderstorm warning remains in effect.

LAT...LON 3470 9677 3476 9682 3489 9667 3487 9655
      3478 9646
TIME...MOT...LOC 0330Z 227DEG 43KT 3493 9652 

$$

..speg.

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, 8:37 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, 9:38 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, 10:39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.