Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 1364

June 21, 200421 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2004, 2:00 AM CDT for 21 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2004, 2:00 AM CDT (07:00 UTC)
Expired: Jun 21, 2004, 5:00 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 21 counties

Blaine County, OK, Canadian County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McIntosh County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 07:02 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

Lamont, OK (KLMN), launched 00:00Z, 7.0 hours before the alert went out and 100 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: 924 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Jun 20, 8:39 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Dewey, Ellis, Greer, Harper and 4 more	2 hr
Jun 20, 9:52 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Ellis, Garfield and 7 more	83 min
Jun 20, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Canadian, Custer, Dewey, Garfield and 10 more	4 hr
Jun 21, 12:59 AM CDT	Mesoscale Discussion	SPC	Craig, Creek, Garfield, Grant, Kay, Kingfisher and 12 more	61 min
Jun 21, 2:25 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Cimarron, Ellis, Greer, Harmon and 5 more	95 min
Jun 21, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron	5 hr
Jun 21, 6:57 PM CDT	Mesoscale Discussion	SPC	Cimarron	93 min

Nearby

Mesoscale Discussions in Oklahoma, 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.