Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 2138

August 27, 20047 counties in Kansas; 15 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2004, 10:06 PM CDT for 7 counties in Kansas; 15 counties in Oklahoma. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2004, 10:06 PM CDT (03:06 UTC)
Expired: Aug 27, 2004, 11:00 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 22 counties

Butler County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Sumner County, KS, Woodson County, KS, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Noble County, OK, Washita County, OK

The radar

The Vance AFB radar (KVNX), 66 km from the middle of the area, began a volume at 03:08 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 00:00Z, 3.1 hours before the alert went out and 120 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: 697 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 2128 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Aug 27, 8:31 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Coffey, Doniphan, Douglas, Franklin and 11 more	59 min

Nearby

Mesoscale Discussions in Oklahoma, 2004 Mesoscale Discussions in Kansas, 2004 Every mesoscale discussion in 2004

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.