Alert archive / Oklahoma / Tornado Warnings in 2017

Tornado Warning 9, NWS Norman, OK

April 16, 2017Major County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 16, 2017, 7:41 PM CDT for Major County, Oklahoma. It was in force for 34 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
Apr 16, 2017, 7:41 PM CDT (00:41 UTC)
Expired
Apr 16, 2017, 8:15 PM CDT
In force
34 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.5 in

County Major County, OK

The radar

The Vance AFB radar (KVNX), 87 km from the middle of the area, began a volume at 00:44 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

TimeReportWhereRemark
Apr 16, 7:42 PM CDTTORNADO4 Nnw Chester, OKKOCO CHASER DOCUMENTED A TORNADO NORTH-NORTHWEST OF CHESTER FROM 742 PM TO 749 PM. THE TORNADO IS ESTIMATED TO HAVE MOVED SOUTHWEST FROM ABOUT 4.5 MILES NORTH-NORTHWEST OF CHESTER. NO KNOWN DAMAGE OCCURRED.

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.

IssuedProductOfficeLasted
Apr 16, 3:37 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.7 hours before the alert went out and 179 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2017-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1796 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2017-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

283 
WFUS54 KOUN 170041
TOROUN
OKC093-170115-
/O.NEW.KOUN.TO.W.0009.170417T0041Z-170417T0115Z/

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

The National Weather Service in Norman has issued a

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

* Until 815 PM CDT
    
* At 741 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 4 miles north of Chester, moving southeast at 15 mph.

  HAZARD...Tornado and ping pong 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. 

* Locations impacted include...
  Chester.

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 3632 9896 3634 9886 3620 9879 3620 9895
TIME...MOT...LOC 0041Z 317DEG 13KT 3628 9891 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

30

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 7:11 PM CDTSpecial Weather StatementOUNWashita34 min
Apr 16, 7:11 PM CDTSevere Thunderstorm WarningOUNKay49 min
Apr 16, 7:12 PM CDTTornado WarningOUNMajor33 min
Apr 16, 7:17 PM CDTSevere Thunderstorm WarningOUNCuster, Washita24 min
Apr 16, 7:23 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey52 min
Apr 16, 7:47 PM CDTTornado WarningOUNBlaine, Dewey28 min
Apr 16, 7:57 PM CDTSevere Thunderstorm WarningOUNKay48 min
Apr 16, 8:11 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey, Major49 min
Apr 16, 8:23 PM CDTSpecial Weather StatementOUNCuster37 min
Apr 16, 8:49 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey, Major41 min
Apr 16, 9:04 PM CDTAreal Flood AdvisoryOUNDewey, Major3 hr
Apr 16, 9:19 PM CDTSpecial Weather StatementOUNGarfield26 min
Apr 16, 9:26 PM CDTAreal Flood AdvisoryOUNKay3 hr
Apr 16, 9:27 PM CDTSevere Thunderstorm WarningOUNDewey, Major, Woodward48 min
Apr 16, 9:38 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant52 min
Apr 16, 10:11 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Roger Mills, Woodward49 min
Apr 16, 10:49 PM CDTSevere Thunderstorm WarningOUNEllis, Roger Mills41 min
Apr 16, 11:18 PM CDTAreal Flood AdvisoryOUNDewey, Ellis, Roger Mills4 hr
Apr 16, 11:30 PM CDTSevere Thunderstorm WarningOUNEllis, Roger Mills45 min
Apr 16, 11:48 PM CDTSpecial Weather StatementOUNPayne27 min
Apr 17, 12:23 AM CDTSpecial Weather StatementOUNEllis37 min
Apr 17, 2:37 AM CDTSpecial Weather StatementOUNRoger Mills23 min
Apr 17, 3:03 AM CDTSpecial Weather StatementOUNRoger Mills27 min
Apr 17, 3:41 AM CDTSpecial Weather StatementOUNRoger Mills19 min
Apr 17, 4:05 AM CDTSpecial Weather StatementOUNGrady25 min
Apr 17, 4:17 AM CDTSpecial Weather StatementOUNMcClain28 min
Apr 17, 4:21 AM CDTSevere Thunderstorm WarningOUNGrady, McClain39 min
Apr 17, 4:30 AM CDTSpecial Weather StatementOUNBryan30 min
Apr 17, 4:57 AM CDTSpecial Weather StatementOUNCleveland33 min
Apr 17, 5:02 AM CDTSpecial Weather StatementOUNAtoka43 min
Apr 17, 5:13 AM CDTSpecial Weather StatementOUNMcClain47 min
Apr 17, 5:17 AM CDTSpecial Weather StatementOUNJefferson28 min
Apr 17, 5:44 AM CDTSpecial Weather StatementOUNGarvin31 min
Apr 17, 6:58 AM CDTSpecial Weather StatementOUNMurray32 min
Apr 17, 7:59 AM CDTSpecial Weather StatementOUNMarshall46 min
Apr 17, 8:23 AM CDTFlash Flood WarningOUNCarter, Love, Marshall5 hr
Apr 17, 8:57 AM CDTSpecial Weather StatementOUNLove48 min
Apr 17, 10:05 AM CDTSpecial Weather StatementOUNCarter25 min
Apr 17, 10:17 AM CDTSpecial Weather StatementOUNStephens43 min
Apr 17, 10:37 AM CDTAreal Flood AdvisoryOUNComanche, Grady, Stephens3 hr
Apr 17, 11:34 AM CDTSpecial Weather StatementOUNComanche41 min
Apr 17, 12:06 PM CDTSpecial Weather StatementOUNStephens39 min
Apr 17, 12:44 PM CDTSpecial Weather StatementOUNCotton, Jefferson, Stephens46 min

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.