Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 744

May 7, 200736 counties in Arkansas; 13 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 7, 2007, 2:22 PM CDT for 36 counties in Arkansas; 13 counties in Missouri. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 7, 2007, 2:22 PM CDT (19:22 UTC)
Expired: May 7, 2007, 4:15 PM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 49 counties

Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Dallas 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, Lawrence County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Madison County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Little Rock radar (KLZK), 100 km from the middle of the area, began a volume at 19:23 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

Springfield, MO (KSGF), launched 12:00Z, 7.4 hours before the alert went out and 238 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: 275 J/kg
Mixed-layer CIN: -287 J/kg
Mixed-layer LCL: 986 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 6, 8:26 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more	64 min
May 6, 8:55 PM CDT	Mesoscale Discussion	SPC	Barton, Jasper	65 min
May 6, 9:07 PM CDT	Tornado Watch	SPC	Barton, Bates, Buchanan, Caldwell, Carroll, Cass and 14 more	6 hr
May 6, 11:34 PM CDT	Mesoscale Discussion	SPC	Barton, Bates, Buchanan, Caldwell, Carroll, Cass and 14 more	56 min
May 7, 1:59 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Buchanan, Caldwell, Carroll, Cass and 12 more	91 min

Nearby

Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Missouri, 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.