Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 53

January 13, 200716 counties in Arkansas; 7 parishes in Louisiana; Panola County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2007, 5:49 PM CST for 16 counties in Arkansas; 7 parishes in Louisiana; Panola County, Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jan 13, 2007, 5:49 PM CST (23:49 UTC)
Expired: Jan 13, 2007, 8:45 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center

All 24 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Monroe County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Union Parish, LA, Webster Parish, LA, Panola County, TX

The radar

The Shreveport radar (KSHV), 155 km from the middle of the area, began a volume at 23:49 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, 11.8 hours before the alert went out and 147 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: 124 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 208 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

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
Jan 12, 6:33 PM CST	Mesoscale Discussion	SPC	Benton, Carroll, Washington	5 hr
Jan 13, 6:28 AM CST	Mesoscale Discussion	SPC	Crawford, Franklin, Sebastian, Washington	4 hr
Jan 13, 10:25 AM CST	Mesoscale Discussion	SPC	Atascosa, Bastrop, Bell, Bexar, Blanco, Caldwell and 13 more	2 hr
Jan 13, 12:36 PM CST	Mesoscale Discussion	SPC	Cooke, Denton, Grayson, Johnson, Montague, Tarrant and 1 more	4 hr

Nearby

Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Louisiana, 2007 Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.