Alert archive / Missouri / Mesoscale Discussions in 2004

Mesoscale Discussion 1270

June 14, 20048 counties in Illinois; 21 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2004, 3:15 PM CDT for 8 counties in Illinois; 21 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jun 14, 2004, 3:15 PM CDT (20:15 UTC)
Expired
Jun 14, 2004, 4:45 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 29 counties

Bond County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Saint Clair County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Miller County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 22 km from the middle of the area, began a volume at 20:15 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

Lincoln, IL (KILX), launched 12:00Z, 8.3 hours before the alert went out and 243 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 2004-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 790 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, Lincoln, IL at 12:00Z on 2004-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.19395878Sfc1 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
790 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
930 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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
Jun 14, 5:25 AM CDTMesoscale DiscussionSPCBureau, DeKalb, Grundy, Henderson, Henry, Kendall and 12 more3 hr
Jun 14, 6:50 AM CDTSevere Thunderstorm WatchSPCBoone, Brown, Bureau, Carroll, Cass, Champaign and 44 more6 hr
Jun 14, 7:42 AM CDTMesoscale DiscussionSPCBureau, Carroll, Cass, DeKalb, DeWitt, Ford and 31 more2 hr
Jun 14, 10:03 AM CDTMesoscale DiscussionSPCBoone, Bureau, Champaign, Cook, DeKalb, DeWitt and 32 more57 min
Jun 14, 4:10 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clay, Clinton, Edwards, Effingham and 29 more6 hr
Jun 13, 11:56 PM CDTMesoscale DiscussionSPCAtchison, Worth3 hr
Jun 14, 11:33 AM CDTMesoscale DiscussionSPCAndrew, Audrain, Buchanan, Caldwell, Carroll, Chariton and 20 more3 hr
Jun 14, 1:20 PM CDTSevere Thunderstorm WatchSPCBates, Benton, Buchanan, Caldwell, Camden, Carroll and 17 more8 hr
Jun 14, 5:09 PM CDTMesoscale DiscussionSPCBates, Benton, Buchanan, Caldwell, Carroll, Cass and 18 more96 min

Nearby

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