Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 806

May 6, 200325 counties in Arkansas; 8 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 7:53 PM CDT for 25 counties in Arkansas; 8 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2003, 7:53 PM CDT (00:53 UTC)
Expired
May 6, 2003, 10:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 33 counties

Baxter County, AR, Cleburne County, AR, Conway County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Lawrence County, AR, Marion County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sevier County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Yell County, AR, Butler County, MO, Carter County, MO, Howell County, MO, Oregon County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO, Wayne County, MO

The radar

The Little Rock radar (KLZK), 99 km from the middle of the area, began a volume at 00:57 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

Springfield, MO (KSGF), launched 00:00Z, 0.9 hours before the alert went out and 170 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2206 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2206 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1529 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
234 m²/s²
Significant tornado parameter
1.5
Supercell composite
14.3

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.

IssuedProductOfficeCountiesLasted
May 6, 7:15 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot5 hr
May 6, 11:08 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 33 more97 min
May 6, 11:30 PM CDTTornado WatchSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 67 more6 hr
May 7, 2:27 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 64 more3 hr
May 7, 4:55 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Chicot, Crittenden, Cross and 8 more6 hr
May 7, 7:06 AM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Desha, Drew, Phillips and 1 more114 min
May 7, 10:50 AM CDTTornado WatchSPCAshley, Chicot, Drew5 hr
May 7, 1:54 PM CDTMesoscale DiscussionSPCChicot2 hr
May 6, 7:03 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Iron, Jefferson, Madison, Perry and 4 more117 min
May 6, 9:35 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Perry, Sainte Genevieve, Scott115 min
May 6, 11:50 PM CDTTornado WatchSPCMississippi6 hr

Nearby

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