Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 1947

July 21, 200314 counties in Arkansas; Dunklin County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 7:06 PM CDT for 14 counties in Arkansas; Dunklin County, Missouri. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2003, 7:06 PM CDT (00:06 UTC)
Expired: Jul 21, 2003, 8:30 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Cleburne County, AR, Craighead County, AR, Faulkner County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO

The radar

The Little Rock radar (KLZK), 127 km from the middle of the area, began a volume at 00:10 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

Little Rock, AR (KLZK), launched 00:00Z, 0.1 hours before the alert went out and 174 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: 3035 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1538 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 9.5

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
Jul 21, 11:39 PM CDT	Mesoscale Discussion	SPC	Benton	2 hr
Jul 22, 1:20 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Crawford and 10 more	7 hr
Jul 22, 2:49 AM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Cleburne, Conway, Crawford, Crittenden and 31 more	116 min
Jul 22, 3:45 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Clark, Cleburne, Conway, Crawford, Crittenden and 30 more	5 hr
Jul 22, 4:47 AM CDT	Mesoscale Discussion	SPC	Cross, Lee, Lonoke, Monroe, Phillips, Prairie and 3 more	118 min

Nearby

Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Missouri, 2003 Every mesoscale discussion in 2003

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.