Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 449

April 10, 200748 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2007, 11:24 PM CDT for 48 counties in Arkansas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2007, 11:24 PM CDT (04:24 UTC)
Expired: Apr 11, 2007, 1:00 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 48 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, White County, AR, Woodruff County, AR

The radar

The Little Rock radar (KLZK), 48 km from the middle of the area, began a volume at 04:25 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.4 hours before the alert went out and 255 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: 200 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 417 m²/s²
0-3 km storm-relative helicity: 552 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 10, 9:19 PM CDT	Mesoscale Discussion	SPC	Howard, Little River, Polk, Scott, Sebastian, Sevier	56 min
Apr 10, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Dallas and 23 more	4 hr
Apr 11, 2:19 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 14 more	116 min
Apr 11, 2:56 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot, Lee, Phillips	5 hr

Nearby

Mesoscale Discussions in Arkansas, 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.