Alert archive / Missouri / Mesoscale Discussions in 2004

Mesoscale Discussion 903

May 25, 20048 counties in Illinois; 18 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 25, 2004, 6:04 PM CDT for 8 counties in Illinois; 18 counties in Missouri. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 25, 2004, 6:04 PM CDT (23:04 UTC)
Expired: May 25, 2004, 7:00 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center

All 26 counties

Bond County, IL, Clinton County, IL, Madison County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Camden County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Laclede County, MO, Maries County, MO, Miller County, MO, Morgan County, MO, Osage County, MO, Phelps County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 23:04 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

Springfield, MO (KSGF), launched 12:00Z, 11.1 hours before the alert went out and 254 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: 1275 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

083 
ACUS11 KWNS 252304
SWOMCD
SPC MCD 252304 
ILZ000-MOZ000-260000-

MESOSCALE DISCUSSION 0903
NWS STORM PREDICTION CENTER NORMAN OK
0604 PM CDT TUE MAY 25 2004

AREAS AFFECTED...CENTRAL AND ERN MO CENTRAL IL

CONCERNING...SEVERE THUNDERSTORM WATCH 286...

VALID 252304Z - 260000Z

ALTHOUGH ISOLATED/MARGINALLY SEVERE HAIL MAY CONTINUE FOR A FEW
HOURS...WW 286 WILL BE ALLOWED TO EXPIRE AT 00Z.

APPEARS PRIMARY SEVERE THUNDERSTORM THREAT WILL CONTINUE TO SHIFT
ESE OF WW 286 THIS EVENING AS SWLY LLJ OVERSPREADS KY. SURFACE COLD
FRONT WILL CONTINUE MOVING SLOWLY SWD INTO SRN MO...WHERE AXIS OF
MODERATE INSTABILITY REMAINS IN PLACE. HOWEVER...EXTENSIVE CLOUDS
AND COOLING OF THE BOUNDARY LAYER THIS EVENING SHOULD MINIMIZE THE
POTENTIAL FOR FURTHER SURFACE BASED STORMS.  MOST LIKELY AREA FOR
ADDITIONAL SEVERE THUNDERSTORMS WILL LIKELY REMAIN NORTH OF THE
FRONT /AS IS OCCURRING NOW IN CENTRAL MO/.  PRIMARY THREAT WITH
THESE STORMS WILL BE FROM MARGINALLY SEVERE HAIL.  SEVERE
THREAT/COVERAGE DOES NOT APPEAR TO WARRANT ADDITIONAL WW ATTM.

..EVANS.. 05/25/2004

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

ATTN...WFO...PAH...ILX...LSX...SGF...

37489282 38419323 39328904 38078905

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 24, 8:15 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Hancock, Henderson, McDonough and 3 more	90 min
May 24, 10:26 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 36 more	64 min
May 24, 10:45 PM CDT	Tornado Watch	SPC	Bond, Brown, Calhoun, Cass, Champaign, Christian and 27 more	5 hr
May 24, 11:45 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Cass, Champaign, Christian, Clark and 24 more	90 min
May 25, 3:00 AM CDT	Severe Thunderstorm Watch	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 15 more	3 hr
May 25, 9:19 AM CDT	Mesoscale Discussion	SPC	Edwards, Gallatin, Hamilton, Hardin, Lawrence, Pope and 4 more	86 min
May 25, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Christian, Clinton, Fayette, Greene and 12 more	6 hr
May 25, 2:39 PM CDT	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more	96 min
May 25, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Clay, Clinton, Crawford, Edwards, Franklin and 22 more	6 hr
May 25, 3:16 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clinton, Fayette, Greene and 12 more	89 min
May 25, 5:03 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Clay, Clinton, Crawford, Edwards and 25 more	87 min
May 24, 10:10 PM CDT	Severe Thunderstorm Watch	SPC	Barton, Bates, Cass, Cedar, Dade, Henry and 6 more	6 hr
May 25, 12:00 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Cass, Cedar, Dade, Henry and 6 more	90 min
May 25, 2:17 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Cedar, Dade, Henry, Jasper and 3 more	118 min
May 25, 11:12 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Callaway, Camden, Cedar, Cole and 25 more	93 min

Nearby

Mesoscale Discussions in Missouri, 2004 Mesoscale Discussions in Illinois, 2004 Every mesoscale discussion in 2004

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.