Alert archive / Oklahoma / Tornado Warnings in 2017

Tornado Warning 8, NWS Norman, OK

April 16, 2017Major County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 16, 2017, 7:12 PM CDT for Major County, Oklahoma. It was in force for 33 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: Apr 16, 2017, 7:12 PM CDT (00:12 UTC)
Expired: Apr 16, 2017, 7:45 PM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

County Major County, OK

The radar

The Vance AFB radar (KVNX), 80 km from the middle of the area, began a volume at 00:11 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
Apr 16, 3:37 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.2 hours before the alert went out and 182 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: 1796 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

993 
WFUS54 KOUN 170012
TOROUN
OKC093-170045-
/O.NEW.KOUN.TO.W.0008.170417T0012Z-170417T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
712 PM CDT SUN APR 16 2017

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Northwestern Major County in northwestern Oklahoma...

* Until 745 PM CDT
    
* At 712 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles north of Chester, moving east at 15 mph.

  HAZARD...Tornado and golf ball 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. 

* This tornadic thunderstorm will remain over mainly rural areas of
  northwestern Major 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.

&&

LAT...LON 3628 9895 3639 9896 3644 9876 3629 9873
TIME...MOT...LOC 0012Z 249DEG 11KT 3633 9892 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

30

1 follow-up statement

716 
WWUS54 KOUN 170033
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
733 PM CDT SUN APR 16 2017

OKC093-170045-
/O.CON.KOUN.TO.W.0008.000000T0000Z-170417T0045Z/
Major OK-
733 PM CDT SUN APR 16 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR WEST
CENTRAL MAJOR COUNTY...
    
At 733 PM CDT, a severe thunderstorm capable of producing a tornado
was located 6 miles north of Chester, moving east at 10 mph.

HAZARD...Tornado and golf ball 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. 

This tornadic thunderstorm will remain over mainly rural areas of
west central Major 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.

&&

LAT...LON 3628 9895 3637 9895 3640 9876 3629 9873
TIME...MOT...LOC 0033Z 254DEG 10KT 3631 9889 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

30

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 7:11 PM CDT	Special Weather Statement	OUN	Washita	34 min
Apr 16, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Kay	49 min
Apr 16, 7:17 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	24 min
Apr 16, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey	52 min
Apr 16, 7:41 PM CDT	Tornado Warning	OUN	Major	34 min
Apr 16, 7:47 PM CDT	Tornado Warning	OUN	Blaine, Dewey	28 min
Apr 16, 7:57 PM CDT	Severe Thunderstorm Warning	OUN	Kay	48 min
Apr 16, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	49 min
Apr 16, 8:23 PM CDT	Special Weather Statement	OUN	Custer	37 min
Apr 16, 8:49 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	41 min
Apr 16, 9:04 PM CDT	Areal Flood Advisory	OUN	Dewey, Major	3 hr
Apr 16, 9:19 PM CDT	Special Weather Statement	OUN	Garfield	26 min
Apr 16, 9:26 PM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Apr 16, 9:27 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	48 min
Apr 16, 9:38 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	52 min
Apr 16, 10:11 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	49 min
Apr 16, 10:49 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	41 min
Apr 16, 11:18 PM CDT	Areal Flood Advisory	OUN	Dewey, Ellis, Roger Mills	4 hr
Apr 16, 11:30 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	45 min
Apr 16, 11:48 PM CDT	Special Weather Statement	OUN	Payne	27 min
Apr 17, 12:23 AM CDT	Special Weather Statement	OUN	Ellis	37 min
Apr 17, 2:37 AM CDT	Special Weather Statement	OUN	Roger Mills	23 min
Apr 17, 3:03 AM CDT	Special Weather Statement	OUN	Roger Mills	27 min
Apr 17, 3:41 AM CDT	Special Weather Statement	OUN	Roger Mills	19 min
Apr 17, 4:05 AM CDT	Special Weather Statement	OUN	Grady	25 min
Apr 17, 4:17 AM CDT	Special Weather Statement	OUN	McClain	28 min
Apr 17, 4:21 AM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	39 min
Apr 17, 4:30 AM CDT	Special Weather Statement	OUN	Bryan	30 min
Apr 17, 4:57 AM CDT	Special Weather Statement	OUN	Cleveland	33 min
Apr 17, 5:02 AM CDT	Special Weather Statement	OUN	Atoka	43 min
Apr 17, 5:13 AM CDT	Special Weather Statement	OUN	McClain	47 min
Apr 17, 5:17 AM CDT	Special Weather Statement	OUN	Jefferson	28 min
Apr 17, 5:44 AM CDT	Special Weather Statement	OUN	Garvin	31 min
Apr 17, 6:58 AM CDT	Special Weather Statement	OUN	Murray	32 min
Apr 17, 7:59 AM CDT	Special Weather Statement	OUN	Marshall	46 min
Apr 17, 8:23 AM CDT	Flash Flood Warning	OUN	Carter, Love, Marshall	5 hr
Apr 17, 8:57 AM CDT	Special Weather Statement	OUN	Love	48 min
Apr 17, 10:05 AM CDT	Special Weather Statement	OUN	Carter	25 min
Apr 17, 10:17 AM CDT	Special Weather Statement	OUN	Stephens	43 min
Apr 17, 10:37 AM CDT	Areal Flood Advisory	OUN	Comanche, Grady, Stephens	3 hr
Apr 17, 11:34 AM CDT	Special Weather Statement	OUN	Comanche	41 min
Apr 17, 12:06 PM CDT	Special Weather Statement	OUN	Stephens	39 min
Apr 17, 12:44 PM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Stephens	46 min

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.