Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 438

April 22, 2004Montague County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2004, 9:06 PM CDT for Montague County, Texas. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2004, 9:06 PM CDT (02:06 UTC)
Expired: Apr 22, 2004, 9:30 PM CDT
In force: 24 min
Issued by: the Storm Prediction Center

County Montague County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 122 km from the middle of the area, began a volume at 02:06 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

Fort Worth, TX (KFWD), launched 00:00Z, 2.1 hours before the alert went out and 102 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: 1372 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1422 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.0

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
Apr 22, 8:00 PM CDT	Mesoscale Discussion	SPC	Cooke, Grayson, Jack	60 min
Apr 22, 11:47 PM CDT	Mesoscale Discussion	SPC	Hansford, Hemphill, Hutchinson, Lipscomb, Ochiltree, Roberts	58 min
Apr 23, 10:10 AM CDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Cottle, Crosby, Dickens, Foard and 9 more	3 hr
Apr 23, 12:15 PM CDT	Tornado Watch	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 33 more	6 hr
Apr 23, 2:41 PM CDT	Mesoscale Discussion	SPC	Baylor, Callahan, Coke, Coleman, Concho, Fisher and 18 more	2 hr
Apr 23, 4:40 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 30 more	65 min
Apr 23, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 28 more	7 hr

Nearby

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.