Alert archive / Oklahoma / Tornado Warnings in 2017

Tornado Warning 21, NWS Norman, OK

May 16, 2017Beckham County, Greer County, Harmon County, Oklahoma

NWS Norman, OK issued this tornado warning at May 16, 2017, 5:48 PM CDT for Beckham County, Greer County, Harmon County, Oklahoma. It was in force for 27 min. 4 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: May 16, 2017, 5:48 PM CDT (22:48 UTC)
Expired: May 16, 2017, 6:15 PM CDT
In force: 27 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 4.0 in

Counties Beckham County, OK, Greer County, OK, Harmon County, OK

The radar

The Altus AFB radar (KFDR), 117 km from the middle of the area, began a volume at 22:49 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
May 16, 5:55 PM CDT	HAIL 1.75	6 S Erick, OK	ON SH 30
May 16, 6:11 PM CDT	TORNADO	11 Nne Madge, OK
May 16, 6:12 PM CDT	HAIL 3.5	5 Ssw Erick, OK
May 16, 6:23 PM CDT	TORNADO	5 Se Erick, OK	2 MINUTE TORNADO REPORTED ABOUT 8 MILES WEST OF DELHI.

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
May 16, 1:54 PM CDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.8 hours before the alert went out and 165 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: 837 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 1292 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

518 
WFUS54 KOUN 162248
TOROUN
OKC009-055-057-162315-
/O.NEW.KOUN.TO.W.0021.170516T2248Z-170516T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
548 PM CDT TUE MAY 16 2017

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Northwestern Greer County in southwestern Oklahoma...
  Northwestern Harmon County in southwestern Oklahoma...
  Southwestern Beckham County in western Oklahoma...

* Until 615 PM CDT
    
* At 548 PM CDT, a severe thunderstorm capable of producing a 
  tornado was located 9 miles east of Lutie Texas, moving northeast 
  at 40 mph.

  HAZARD...Tornado and softball 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...
  Erick.

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 3513 10000 3527 9978 3500 9967 3496 10000
TIME...MOT...LOC 2248Z 244DEG 33KT 3501 10006 

TORNADO...RADAR INDICATED
HAIL...4.00IN

$$

..speg.

1 follow-up statement

634 
WWUS54 KOUN 162253
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
553 PM CDT TUE MAY 16 2017

OKC009-055-057-162315-
/O.CON.KOUN.TO.W.0021.000000T0000Z-170516T2315Z/
Greer OK-Harmon OK-Beckham OK-
553 PM CDT TUE MAY 16 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
NORTHWESTERN GREER...NORTHWESTERN HARMON AND SOUTHWESTERN BECKHAM
COUNTIES...
    
At 552 PM CDT, a confirmed tornado was located 10 miles northwest of 
Madge Oklahoma, moving east-northeast at 25 mph. This is a very 
dangerous storm.

HAZARD...Damaging tornado and softball 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...
Erick.

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 3513 10000 3527 9978 3500 9967 3496 10000
TIME...MOT...LOC 2252Z 249DEG 21KT 3501 10004 

TORNADO...OBSERVED
HAIL...4.00IN

$$

..speg.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 5:16 PM CDT	Special Weather Statement	OUN	Beckham	29 min
May 16, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	46 min
May 16, 5:45 PM CDT	Special Weather Statement	OUN	Roger Mills	30 min
May 16, 5:54 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	51 min
May 16, 5:55 PM CDT	Tornado Warning Tornado observed	OUN	Roger Mills	50 min
May 16, 6:13 PM CDT	Tornado Warning Tornado observed	OUN	Beckham, Greer	47 min
May 16, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Roger Mills, Woodward	66 min
May 16, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	47 min
May 16, 6:44 PM CDT	Tornado Warning	OUN	Custer, Dewey, Ellis, Roger Mills	46 min
May 16, 6:48 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Washita	42 min
May 16, 6:54 PM CDT	Tornado Warning Tornado observed	OUN	Beckham, Washita	51 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.