Alert archive / Oklahoma / Mesoscale Discussions in 2010

Mesoscale Discussion 1839

September 15, 201021 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Sep 15, 2010, 5:34 PM CDT for 21 counties in Oklahoma. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Sep 15, 2010, 5:34 PM CDT (22:34 UTC)
Expired: Sep 15, 2010, 7:00 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 21 counties

Alfalfa County, OK, Blaine County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Tulsa County, OK, Washington County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 66 km from the middle of the area, began a volume at 22:36 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 10.6 hours before the alert went out and 56 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: 1140 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 972 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 15, 2:47 PM CDT	Mesoscale Discussion	SPC	Grant, Kay	58 min
Sep 15, 5:54 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 12 more	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2010 Every mesoscale discussion in 2010

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.