Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 531

April 22, 20039 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2003, 11:29 AM CDT for 9 counties in Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2003, 11:29 AM CDT (16:29 UTC)
Expired: Apr 22, 2003, 12:30 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Austin County, TX, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Grimes County, TX, Harris County, TX, Montgomery County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 94 km from the middle of the area, began a volume at 16:30 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.5 hours before the alert went out and 253 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1943 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 9:18 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Comanche, Coryell, Eastland, Erath and 13 more	117 min
Apr 22, 3:41 PM CDT	Mesoscale Discussion	SPC	Andrews, Cochran, Crane, Crockett, Dawson, Ector and 16 more	94 min
Apr 22, 4:55 PM CDT	Tornado Watch	SPC	Borden, Cochran, Coke, Concho, Crockett, Crosby and 32 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2003 Every mesoscale discussion in 2003

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.