Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 1374

June 21, 200416 counties in Oklahoma; Clay County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2004, 11:27 PM CDT for 16 counties in Oklahoma; Clay County, Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2004, 11:27 PM CDT (04:27 UTC)
Expired: Jun 22, 2004, 1:00 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Blaine County, OK, Canadian County, OK, Carter County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Kingfisher County, OK, Major County, OK, McClain County, OK, Roger Mills County, OK, Stephens County, OK, Washita County, OK, Clay County, TX

The radar

The Norman radar (KTLX), 83 km from the middle of the area, began a volume at 04:29 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, 4.5 hours before the alert went out and 75 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: 1521 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1043 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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
Jun 21, 7:52 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Craig, Creek, Delaware, Garfield, Grant and 16 more	83 min
Jun 21, 8:05 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Greer, Harmon, Jackson	7 hr
Jun 21, 10:17 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Custer, Dewey and 9 more	88 min
Jun 21, 10:25 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Canadian, Custer, Dewey, Garfield, Kingfisher and 5 more	5 hr
Jun 21, 11:44 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Jackson	91 min
Jun 22, 2:48 AM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Tillman	27 min
Jun 22, 4:05 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Coal, Haskell, Hughes and 10 more	2 hr
Jun 22, 10:27 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Brazoria, Cass, Chambers, Cherokee and 34 more	2 hr
Jun 22, 11:55 AM CDT	Severe Thunderstorm Watch	SPC	Angelina, Brazoria, Chambers, Galveston, Hardin, Harris and 14 more	5 hr
Jun 22, 3:10 PM CDT	Mesoscale Discussion	SPC	Jasper, Jefferson, Newton, Orange, Panola, Sabine and 2 more	95 min

Nearby

Mesoscale Discussions in Oklahoma, 2004 Mesoscale Discussions in Texas, 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.