Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 812

June 4, 20146 counties in Illinois; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 7:01 AM CDT for 6 counties in Illinois; 5 counties in Missouri. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jun 4, 2014, 7:01 AM CDT (12:01 UTC)
Expired
Jun 4, 2014, 8:30 AM CDT
In force
89 min
Issued by
the Storm Prediction Center

Counties Bond County, IL, Clinton County, IL, Fayette County, IL, Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Iron County, MO, Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 12:03 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, 0.0 hours before the alert went out and 249 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 2014-06-04Temperature 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 2014-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 348 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
637 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
348 m²/s²
0-3 km storm-relative helicity
663 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
Jun 3, 8:05 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Greene, Jersey, Morgan and 2 more85 min
Jun 3, 9:25 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Pike5 hr
Jun 3, 11:04 PM CDTSevere Thunderstorm WatchSPCCass, Fulton, Logan, Mason, Menard, Morgan and 4 more4 hr
Jun 4, 1:29 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Champaign, Christian and 23 more91 min
Jun 4, 1:52 AM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Coles, DeWitt, Douglas, Edgar and 6 more3 hr
Jun 4, 3:46 AM CDTMesoscale DiscussionSPCChampaign, Coles, Douglas, Edgar, Moultrie, Piatt and 2 more59 min
Jun 4, 5:00 AM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more4 hr
Jun 4, 12:20 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more115 min
Jun 4, 2:21 PM CDTTornado WatchSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more6 hr
Jun 4, 6:57 PM CDTMesoscale DiscussionSPCAlexander, Massac, Pope, Pulaski2 hr
Jun 3, 7:04 PM CDTMesoscale DiscussionSPCAndrew, Atchison, DeKalb, Gentry, Harrison, Holt and 2 more56 min
Jun 3, 9:41 PM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Chariton and 16 more64 min
Jun 3, 11:30 PM CDTMesoscale DiscussionSPCAudrain, Boone, Caldwell, Callaway, Carroll, Cass and 23 more60 min
Jun 3, 11:45 PM CDTSevere Thunderstorm WatchSPCAudrain, Benton, Boone, Callaway, Carroll, Cass and 25 more5 hr
Jun 4, 12:28 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Holt, Nodaway, Platte62 min
Jun 4, 12:50 AM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 11 more3 hr
Jun 4, 3:32 AM CDTMesoscale DiscussionSPCBenton, Camden, Cole, Cooper, Henry, Johnson and 5 more88 min
Jun 4, 12:54 PM CDTMesoscale DiscussionSPCBollinger, Butler, Carter, Dent, Dunklin, Howell and 10 more2 hr
Jun 4, 3:47 PM CDTMesoscale DiscussionSPCBarry, Camden, Cedar, Christian, Dade, Dallas and 14 more118 min

Nearby

Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Missouri, 2014Every mesoscale discussion in 2014

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.