Alert archive / Oklahoma / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 347

June 17, 201712 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2017, 9:33 PM CDT for 12 counties in Oklahoma. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 17, 2017, 9:33 PM CDT (02:33 UTC)
Expired
Jun 18, 2017, 5:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt

Counties Alfalfa County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 52 km from the middle of the area, began a volume at 02:35 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 17, 9:46 PM CDTSevere Thunderstorm WarningOUNHarper, Woods59 min
Jun 17, 10:42 PM CDTSevere Thunderstorm WarningOUNWoods13 min
Jun 17, 11:40 PM CDTSevere Thunderstorm WarningOUNKay50 min
Jun 18, 1:07 AM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble22 min
Jun 18, 2:41 AM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Noble, Payne49 min
Jun 18, 3:03 AM CDTSevere Thunderstorm WarningOUNGarfield, Major42 min
Jun 18, 3:28 AM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne47 min
Jun 18, 3:39 AM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan, Noble, Payne51 min
Jun 18, 4:10 AM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Oklahoma, Payne50 min
Jun 18, 4:59 AM CDTSevere Thunderstorm WarningOUNLincoln46 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 2.6 hours before the alert went out and 159 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, Dodge City, at 00:00Z on 2017-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3842 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, Dodge City, at 00:00Z on 2017-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 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
3842 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
2123 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 17, 8:23 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Grant, Harper, Kay, Woods2 hr
Jun 17, 9:34 PM CDTMesoscale DiscussionSPCCraig, Delaware, Kay, Mayes, Nowata, Osage and 5 more116 min
Jun 17, 10:18 PM CDTSevere Thunderstorm WatchSPCCraig, Creek, Nowata, Osage, Ottawa, Pawnee and 3 more6 hr
Jun 17, 11:55 PM CDTMesoscale DiscussionSPCAlfalfa, Craig, Creek, Delaware, Garfield, Grant and 12 more95 min
Jun 18, 3:44 AM CDTMesoscale DiscussionSPCCleveland, Coal, Creek, Garfield, Hughes, Kingfisher and 14 more2 hr
Jun 18, 4:14 AM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Cherokee, Cleveland, Coal, Creek and 20 more6 hr
Jun 18, 7:18 AM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Coal, Creek, Haskell and 14 more117 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2017Every severe thunderstorm watch 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.