Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 898

May 25, 200418 counties in Illinois; 10 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 25, 2004, 3:16 PM CDT for 18 counties in Illinois; 10 counties in Missouri. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
May 25, 2004, 3:16 PM CDT (20:16 UTC)
Expired
May 25, 2004, 4:45 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 28 counties

Bond County, IL, Calhoun County, IL, Christian County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jefferson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Shelby County, IL, Washington County, IL, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Montgomery County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 36 km from the middle of the area, began a volume at 20:19 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 12:00Z, 8.3 hours before the alert went out and 205 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 12:00Z on 2004-05-25Temperature 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 12:00Z on 2004-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.1939587897117Sfc1 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
951 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
-7 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 24, 8:15 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Hancock, Henderson, McDonough and 3 more90 min
May 24, 10:26 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 36 more64 min
May 24, 10:45 PM CDTTornado WatchSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 27 more5 hr
May 24, 11:45 PM CDTMesoscale DiscussionSPCBond, Calhoun, Cass, Champaign, Christian, Clark and 24 more90 min
May 25, 3:00 AM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 15 more3 hr
May 25, 9:19 AM CDTMesoscale DiscussionSPCEdwards, Gallatin, Hamilton, Hardin, Lawrence, Pope and 4 more86 min
May 25, 1:05 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Christian, Clinton, Fayette, Greene and 12 more6 hr
May 25, 2:39 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more96 min
May 25, 3:00 PM CDTSevere Thunderstorm WatchSPCAlexander, Clay, Clinton, Crawford, Edwards, Franklin and 22 more6 hr
May 25, 5:03 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clay, Clinton, Crawford, Edwards and 25 more87 min
May 25, 6:04 PM CDTMesoscale DiscussionSPCBond, Clinton, Madison, Monroe, Perry, Randolph and 2 more56 min
May 24, 10:10 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Cass, Cedar, Dade, Henry and 6 more6 hr
May 25, 12:00 AM CDTMesoscale DiscussionSPCBarton, Bates, Cass, Cedar, Dade, Henry and 6 more90 min
May 25, 2:17 AM CDTMesoscale DiscussionSPCBarton, Bates, Cedar, Dade, Henry, Jasper and 3 more118 min
May 25, 11:12 AM CDTMesoscale DiscussionSPCBenton, Boone, Callaway, Camden, Cedar, Cole and 25 more93 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.