Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 502

March 30, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2008, 9:08 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 30, 2008, 9:08 AM CDT (14:08 UTC)
Expired: Mar 30, 2008, 11:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 37 counties

Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Webster Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Titus County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 58 km from the middle of the area, began a volume at 14:10 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

Shreveport, LA (KSHV), launched 12:00Z, 2.1 hours before the alert went out and 59 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: 1366 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.4

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
Mar 29, 8:11 PM CDT	Mesoscale Discussion	SPC	Lafayette, Miller	64 min
Mar 30, 12:45 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Bradley, Calhoun, Carroll, Clark and 44 more	2 hr
Mar 30, 6:48 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Columbia, Lafayette, Miller and 2 more	117 min
Mar 30, 12:11 PM CDT	Mesoscale Discussion	SPC	Lafayette	2 hr
Mar 30, 3:54 PM CDT	Mesoscale Discussion	SPC	Beauregard, Caddo, De Soto, Natchitoches, Red River, Sabine and 1 more	2 hr
Mar 30, 3:16 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Garfield, Grady and 6 more	119 min
Mar 30, 5:48 PM CDT	Tornado Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 16 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2008 Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Louisiana, 2008 Every mesoscale discussion in 2008

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.