Alert archive / Missouri / Mesoscale Discussions in 2003

Mesoscale Discussion 802

May 6, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 5:33 PM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
May 6, 2003, 5:33 PM CDT (22:33 UTC)
Expired
May 6, 2003, 7:30 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 59 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Franklin County, AR, Fulton County, AR, Johnson County, AR, Logan County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Sebastian County, AR, Washington County, AR, Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Barry County, MO, Carter County, MO, Christian County, MO, City of Saint Louis, MO, Crawford County, MO, Dade County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Greene County, MO, Howell County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Oregon County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Louis County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Haskell County, OK, Sequoyah County, OK

The radar

The Springfield radar (KSGF), 108 km from the middle of the area, began a volume at 22:34 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, 10.6 hours before the alert went out and 148 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 2003-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 34 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 2003-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 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
34 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
1877 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
115 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

352 
ACUS11 KWNS 062234
SWOMCD
SPC MCD 062233 
ILZ000-MOZ000-ARZ000-OKZ000-TXZ000-070030-

MESOSCALE DISCUSSION 0802
NWS STORM PREDICTION CENTER NORMAN OK
0533 PM CDT TUE MAY 06 2003

AREAS AFFECTED...SW /CNTRL MO...WRN AR...ERN OK

CONCERNING...TORNADO WATCH 269...272...273...

VALID 062233Z - 070030Z

SEVERE THREAT CONTINUES ACROSS REMAIN VALID PORTIONS OF WWS.

CONVECTION CONTINUES TO INCREASE IN COVERAGE/INTENSITY IN A BROKEN
LINE ALONG DRY LINE EXTENDING SOUTHWARD FROM SURFACE LOW NOW
NORTHWEST OF JOPLIN.  NUMEROUS SUPERCELLS ARE EMBEDDED WITHIN
LINE...FEED BY VERY MOIST UNSTABLE BOUNDARY LAYER WITH CAPE UP TO
3000 J/KG.  ALTHOUGH LOW-LEVEL HODOGRAPHS ARE NOT PARTICULARLY
LARGE...VERTICAL SHEAR BENEATH MODERATELY STRONG MID/UPPER FLOW IS
STRONG AND LOW-LEVEL THERMODYNAMIC ENVIRONMENT REMAINS FAVORABLE FOR
AT LEAST ISOLATED BRIEF TORNADOES.  ACTIVITY WILL CONTINUE TO EVOLVE
INTO INTENSE SQUALL LINE NEXT FEW HOURS...GRADUALLY MERGING WITH
EAST CENTRAL MISSOURI CLUSTER...AND BECOMING PART OF LARGE MESOSCALE
CONVECTIVE SYSTEM ACROSS THE MIDDLE MISSISSIPPI VALLEY BE EARLY THIS
EVENING.

..KERR.. 05/06/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...PAH...ILX...LSX...MEG...LZK...SGF...SHV...TSA...FWD...OUN...

38729125 39169082 39308967 38848849 37658929 38139088
38279131 

34239616 35209518 36219476 37419398 37669263 38169157
37249027 35979210 35029387 33739574

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 5, 9:05 PM CDTTornado WatchSPCPhillips7 hr
May 5, 10:58 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Fulton, Marion2 hr
May 6, 1:26 AM CDTMesoscale DiscussionSPCCrittenden, Lee, St. Francis3 hr
May 6, 1:50 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more6 hr
May 6, 5:06 AM CDTMesoscale DiscussionSPCCrittenden, Cross, Lee, Mississippi, Phillips, St. Francis3 hr
May 6, 10:32 AM CDTMesoscale DiscussionSPCBenton, Crawford, Franklin, Sebastian, Washington118 min
May 6, 11:40 AM CDTTornado WatchSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 4 more7 hr
May 6, 3:05 PM CDTTornado WatchSPCLogan, Polk, Scott, Sebastian6 hr
May 6, 6:55 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 32 more5 hr
May 6, 9:37 AM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Crawford, Cumberland and 15 more113 min
May 6, 11:55 AM CDTSevere Thunderstorm WatchSPCBond, Clay, Clinton, Crawford, Edwards, Effingham and 21 more4 hr
May 6, 1:23 PM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Crawford, Edwards, Effingham and 17 more2 hr
May 6, 5:08 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Fayette, Jackson, Jefferson and 9 more2 hr
May 6, 5:40 PM CDTTornado WatchSPCAlexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more6 hr
May 6, 6:49 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Caldwell, Camden, Carroll and 27 more3 hr
May 6, 7:55 AM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Cass, Cedar and 22 more5 hr
May 6, 11:29 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Clay and 18 more2 hr
May 6, 2:15 PM CDTTornado WatchSPCBoone, Callaway, Camden, Carter, Cole, Cooper and 27 more5 hr
May 6, 3:42 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Callaway, Camden and 20 more2 hr
May 6, 6:35 PM CDTTornado WatchSPCBarry, Barton, Camden, Carter, Cedar, Christian and 31 more5 hr
May 6, 2:47 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Haskell, Latimer and 5 more118 min

Nearby

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