Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 329

March 25, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2003, 1:58 PM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 25, 2003, 1:58 PM CST (19:58 UTC)
Expired: Mar 25, 2003, 4:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 31 counties

Clay County, AR, Cleburne County, AR, Conway 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, Randolph County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Lyon County, KY, Marshall County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN

The radar

The Little Rock radar (KLZK), 137 km from the middle of the area, began a volume at 19:59 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

Little Rock, AR (KLZK), launched 12:00Z, 8.0 hours before the alert went out and 161 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: 13 J/kg
Mixed-layer CIN: -639 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Mar 25, 1:39 PM CST	Mesoscale Discussion	SPC	Howard, Little River, Sevier	3 hr
Mar 25, 2:40 PM CST	Severe Thunderstorm Watch	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 15 more	5 hr
Mar 25, 3:05 PM CST	Severe Thunderstorm Watch	SPC	Howard, Little River, Montgomery, Pike, Polk, Scott and 1 more	6 hr
Mar 25, 4:55 PM CST	Mesoscale Discussion	SPC	Arkansas, Calhoun, Clark, Cleveland, Crittenden, Cross and 19 more	3 hr
Mar 25, 5:20 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Calhoun, Clark, Cleveland, Conway, Craighead and 36 more	6 hr
Mar 25, 5:39 PM CST	Mesoscale Discussion	SPC	Arkansas, Calhoun, Clark, Cleveland, Crittenden, Cross and 19 more	2 hr
Mar 25, 2:33 AM CST	Mesoscale Discussion	SPC	Barton, Bates, Benton, Camden, Cedar, Cooper and 11 more	3 hr

Nearby

Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Kentucky, 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.