Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 710

June 11, 201810 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2018, 6:11 PM CDT for 10 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jun 11, 2018, 6:11 PM CDT (23:11 UTC)
Expired
Jun 11, 2018, 8:45 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Greer County, OK, Kiowa County, OK, Major County, OK, Washita County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 123 km from the middle of the area, began a volume at 23:09 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.2 hours before the alert went out and 161 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 12:00Z on 2018-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 214 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 12:00Z on 2018-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939Sfc1 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
214 J/kg
Mixed-layer CIN
-288 J/kg
Mixed-layer LCL
2029 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

855 
ACUS11 KWNS 112312
SWOMCD
SPC MCD 112311 
KSZ000-OKZ000-120145-

Mesoscale Discussion 0710
NWS Storm Prediction Center Norman OK
0611 PM CDT Mon Jun 11 2018

Areas affected...western Oklahoma

Concerning...Severe potential...Watch unlikely 

Valid 112311Z - 120145Z

Probability of Watch Issuance...5 percent

SUMMARY...Isolated storms capable of hail and wind are possible
across western Oklahoma this evening, but a watch is unlikely.

DISCUSSION...Visible imagery shows a substantial CU field across
western OK where hot temperatures have removed CIN along the
dryline. Meanwhile, robust low-level moisture remains in place with
southeasterly surface winds. The result is very strong instability,
and a zone of uncapped air. Surface convergence near the dryline may
be sufficient for a few storms this evening, with weakly veering
winds with height supporting a south or southwestward motion. Hail
and locally damaging wind will be possible should storms initiate.

..Jewell/Hart.. 06/11/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...ICT...OUN...DDC...

LAT...LON   36949814 35589840 34919868 34739911 34659946 34839983
            35169993 35689968 36319930 36719902 36939876 37059842
            36949814

Nearby

Mesoscale Discussions in Oklahoma, 2018Every mesoscale discussion in 2018

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.