Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 1809

July 13, 200312 counties in Arkansas; Cherokee County, Crawford County, Kansas; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 1:30 PM CDT for 12 counties in Arkansas; Cherokee County, Crawford County, Kansas; 7 counties in Missouri. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2003, 1:30 PM CDT (18:30 UTC)
Expired: Jul 13, 2003, 2:30 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 21 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Pope County, AR, Van Buren County, AR, Washington County, AR, Cherokee County, KS, Crawford County, KS, Barry County, MO, Barton County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO

The radar

The Springfield radar (KSGF), 90 km from the middle of the area, began a volume at 18:33 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.

Severe Thunderstorm Watch 740Jul 13, 5:10 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.5 hours before the alert went out and 45 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: 1689 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 835 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.4

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 13, 11:30 AM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 11 more	2 hr
Jul 13, 11:55 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more	6 hr
Jul 13, 3:53 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Crittenden, Desha, Lee and 3 more	67 min
Jul 13, 4:44 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Clay, Cleburne, Craighead, Fulton and 12 more	61 min
Jul 13, 5:10 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Carroll, Cleburne, Craighead, Crittenden and 18 more	5 hr
Jul 13, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	Chicot	4 hr
Jul 13, 6:54 PM CDT	Mesoscale Discussion	SPC	Crittenden, Cross, Jackson, Lee, Monroe, Poinsett and 4 more	96 min
Jul 12, 9:02 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Greeley, Logan, Rawlins, Scott, Sherman and 3 more	118 min
Jul 13, 2:56 PM CDT	Mesoscale Discussion	SPC	Harper, Kingman	94 min

Nearby

Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Missouri, 2003 Mesoscale Discussions in Kansas, 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.