Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 197

February 24, 20076 counties in Arkansas; Union Parish, Louisiana; Bolivar County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2007, 1:45 PM CST for 6 counties in Arkansas; Union Parish, Louisiana; Bolivar County, Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 24, 2007, 1:45 PM CST (19:45 UTC)
Expired: Feb 24, 2007, 3:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Union Parish, LA, Bolivar County, MS

The radar

The Little Rock radar (KLZK), 163 km from the middle of the area, began a volume at 19:46 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

Jackson, MS (KJAN), launched 12:00Z, 7.8 hours before the alert went out and 201 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: 1290 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 352 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
Feb 24, 8:29 AM CST	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Conway, Crawford, Dallas and 31 more	61 min
Feb 24, 8:47 AM CST	Tornado Watch PDS	SPC	Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 42 more	9 hr
Feb 24, 10:35 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 59 more	115 min
Feb 24, 1:10 PM CST	Tornado Watch PDS	SPC	Ashley, Chicot, Crittenden, Cross, Lee, Phillips and 1 more	7 hr
Feb 24, 3:49 PM CST	Mesoscale Discussion	SPC	Ashley, Chicot, Desha, Drew, Phillips	86 min
Feb 24, 4:31 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 12 more	59 min

Nearby

Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Louisiana, 2007 Mesoscale Discussions in Mississippi, 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.