Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 740

May 4, 200327 counties in Arkansas; 24 counties in Missouri; 7 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 4, 2003, 5:20 PM CDT for 27 counties in Arkansas; 24 counties in Missouri; 7 counties in Oklahoma. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
May 4, 2003, 5:20 PM CDT (22:20 UTC)
Expired
May 4, 2003, 6:15 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
All 58 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Perry County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Barton County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Polk County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, LeFlore County, OK, Ottawa County, OK, Sequoyah County, OK

The radar

The Springfield radar (KSGF), 83 km from the middle of the area, began a volume at 22:27 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 12:00Z, 10.3 hours before the alert went out and 67 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 12:00Z on 2003-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 50 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2003-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 282 square meters per square second.1939587897Sfc1 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
50 J/kg
Mixed-layer CIN
-362 J/kg
Mixed-layer LCL
735 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
282 m²/s²
0-3 km storm-relative helicity
474 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.7

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 4, 12:35 PM CDTTornado WatchSPCBenton, Crawford, Sebastian, Washington6 hr
May 4, 3:05 PM CDTMesoscale DiscussionSPCBenton115 min
May 4, 5:01 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 7 more3 hr
May 4, 6:05 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more7 hr
May 4, 6:55 PM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 9 more6 hr
May 3, 11:46 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Barton, Bates, Benton, Buchanan and 30 more59 min
May 4, 12:10 AM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Bates, Buchanan, Caldwell, Cass and 15 more6 hr
May 4, 2:58 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Audrain, Bates, Benton and 45 more92 min
May 4, 4:50 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Audrain, Bates, Benton and 73 more6 hr
May 4, 7:43 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Audrain, Benton, Boone and 59 more2 hr
May 4, 12:14 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Clinton, DeKalb, Gentry and 4 more2 hr
May 4, 12:45 PM CDTTornado WatchSPCAndrew, Atchison, Bates, Benton, Buchanan, Caldwell and 16 more6 hr
May 4, 2:22 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Holt, Nodaway, Platte113 min
May 4, 3:56 PM CDTMesoscale DiscussionSPCAdair, Chariton, Grundy, Harrison, Linn, Livingston and 6 more2 hr
May 4, 4:28 PM CDTMesoscale DiscussionSPCBuchanan, Caldwell, Clay, Clinton, DeKalb, Jackson and 3 more62 min
May 4, 4:43 PM CDTMesoscale DiscussionSPCBarton, Bates, Cedar, Dade, Jasper, Newton and 2 more2 hr
May 4, 5:25 PM CDTSevere Thunderstorm WatchSPCAdair, Audrain, Bollinger, Callaway, Cape Girardeau, Clark and 28 more6 hr
May 4, 6:20 PM CDTTornado WatchSPCAndrew, Bates, Benton, Boone, Buchanan, Caldwell and 34 more6 hr
May 3, 8:05 PM CDTTornado WatchSPCBeckham, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more6 hr
May 3, 10:00 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Comanche, Cotton and 12 more2 hr
May 4, 11:44 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Cherokee, Coal, Craig, Creek and 27 more3 hr
May 4, 2:16 PM CDTMesoscale DiscussionSPCBryan, Johnston, Love, Marshall, Murray119 min
May 4, 3:00 PM CDTTornado WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 6 more6 hr
May 4, 6:28 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Johnston and 5 more2 hr

Nearby

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