Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 930

May 26, 200431 counties in Illinois; 11 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 9:36 PM CDT for 31 counties in Illinois; 11 counties in Missouri. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
May 26, 2004, 9:36 PM CDT (02:36 UTC)
Expired
May 26, 2004, 10:30 PM CDT
In force
54 min
Issued by
the Storm Prediction Center
All 42 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Pike County, IL, Richland County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Audrain County, MO, Callaway County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 93 km from the middle of the area, began a volume at 02:36 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

Lincoln, IL (KILX), launched 00:00Z, 2.6 hours before the alert went out and 164 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, Lincoln, IL at 00:00Z on 2004-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lincoln, IL at 00:00Z on 2004-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -75 square meters per square second.1939587897117136156Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1412 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
-75 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

373 
ACUS11 KWNS 270237
SWOMCD
SPC MCD 270236 
INZ000-ILZ000-MOZ000-270330-

MESOSCALE DISCUSSION 0930
NWS STORM PREDICTION CENTER NORMAN OK
0936 PM CDT WED MAY 26 2004

AREAS AFFECTED...ECNTRL MO INTO SCNTRL IL

CONCERNING...SEVERE THUNDERSTORM WATCH 300...

VALID 270236Z - 270330Z

BANDS OF ELEVATED TSTMS WITH A MARGINAL SEVERE HAIL THREAT PERSIST
ACROSS ECNTRL MO INTO SCNTRL IL LATE THIS EVENING AND ARE DEVELOPING
WITHIN INCREASING WARM ADVECTION REGIME ALONG LLJ AXIS.  THIS LLJ IS
EXPECTED TO BECOME MORE SWLY AND AIM INTO THE LOWER OH VLY/KY BY
0600 UTC.  THIS MAY SHIFT THE SEVERE WEATHER THREAT FARTHER SE INTO
MCS ALONG THE OH RVR WITH TIME.  UNLESS AN UPSWING IN INTENSITY
OCCURS IN THE NEXT COUPLE OF HOURS...WW 300 MAY BE CANCELLED EARLY
OR NOT REISSUED AFTER THE 0400 UTC EXPIRATION.

..RACY.. 05/27/2004

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

ATTN...WFO...IND...ILX...LSX...

40069211 39988761 38628767 38719208

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 7:57 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more63 min
May 26, 8:55 PM CDTTornado WatchSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 16 more5 hr
May 26, 11:14 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more2 hr
May 27, 1:53 AM CDTMesoscale DiscussionSPCChristian, Clark, Clay, Coles, Crawford, Cumberland and 9 more3 hr
May 27, 11:10 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, DeWitt and 25 more2 hr
May 27, 11:55 AM CDTSevere Thunderstorm WatchSPCAdams, Brown, Hancock, Henderson, McDonough, Pike and 3 more6 hr
May 27, 1:07 PM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, DeWitt, Douglas, Edgar and 12 more113 min
May 27, 1:30 PM CDTSevere Thunderstorm WatchSPCCass, Champaign, Christian, Coles, DeWitt, Douglas and 22 more7 hr
May 27, 1:52 PM CDTMesoscale DiscussionSPCAdams, Calhoun, Greene, Jersey, Macoupin, Pike and 1 more113 min
May 27, 2:25 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clinton, Fayette, Franklin, Greene and 12 more7 hr
May 27, 3:12 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Cumberland, DeWitt and 13 more2 hr
May 27, 3:37 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clay, Clinton, Edwards, Effingham and 22 more113 min
May 27, 4:00 PM CDTSevere Thunderstorm WatchSPCClark, Clay, Crawford, Cumberland, Edwards, Effingham and 7 more4 hr
May 27, 5:01 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Fayette, Greene, Jackson and 11 more89 min
May 27, 6:00 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Edgar, Macon, Morgan and 4 more90 min
May 26, 8:29 PM CDTMesoscale DiscussionSPCMcDonald91 min
May 26, 8:30 PM CDTTornado WatchSPCBarton, Bates, Benton, Camden, Cedar, Dade and 15 more6 hr
May 26, 11:40 PM CDTSevere Thunderstorm WatchSPCCass, Clay, Cooper, Henry, Howard, Jackson and 6 more5 hr
May 27, 1:16 AM CDTMesoscale DiscussionSPCCarroll, Cass, Clay, Cooper, Howard, Jackson and 6 more119 min
May 27, 1:50 AM CDTTornado WatchSPCBarton, Camden, Cedar, Christian, Dade, Dallas and 15 more4 hr
May 27, 3:27 AM CDTMesoscale DiscussionSPCCedar, Christian, Dade, Dallas, Douglas, Greene and 12 more2 hr
May 27, 3:55 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Carroll, Cass and 14 more95 min

Nearby

Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Missouri, 2004Every 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.