Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 230

March 13, 200315 counties in Arkansas; McCurtain County, Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2003, 12:56 AM CST for 15 counties in Arkansas; McCurtain County, Oklahoma; 12 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 13, 2003, 12:56 AM CST (06:56 UTC)
Expired: Mar 13, 2003, 3:00 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Clark County, AR, Columbia County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Morris County, TX, Red River County, TX, Titus County, TX

The radar

The Shreveport radar (KSHV), 151 km from the middle of the area, began a volume at 06:59 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 nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 6.9 hours before the alert went out and 151 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: 1173 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.0

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 12, 9:52 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Fulton, Marion, Sharp	113 min
Mar 13, 1:35 AM CST	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more	115 min
Mar 12, 7:48 PM CST	Mesoscale Discussion	SPC	Craig, Delaware, Nowata, Osage, Ottawa, Rogers and 1 more	57 min
Mar 12, 8:25 PM CST	Severe Thunderstorm Watch	SPC	Craig, Nowata, Ottawa, Washington	6 hr
Mar 12, 8:36 PM CST	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Creek, Grady, Kingfisher and 12 more	84 min
Mar 12, 8:55 PM CST	Severe Thunderstorm Watch	SPC	Adair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 27 more	5 hr
Mar 12, 11:03 PM CST	Mesoscale Discussion	SPC	Atoka, Caddo, Carter, Cleveland, Coal, Garvin and 17 more	117 min
Mar 13, 7:52 AM CST	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 9 more	113 min
Mar 13, 8:30 AM CST	Severe Thunderstorm Watch	SPC	Chambers, Galveston, Hardin, Jasper, Jefferson, Liberty and 6 more	6 hr
Mar 13, 10:53 AM CST	Mesoscale Discussion	SPC	Chambers, Galveston, Hardin, Jasper, Jefferson, Liberty and 5 more	2 hr
Mar 13, 3:53 PM CST	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Brazos, Chambers, Colorado and 24 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Texas, 2003 Mesoscale Discussions in Oklahoma, 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.