Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 230

April 8, 20156 counties in Illinois; 21 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2015, 12:01 PM CDT for 6 counties in Illinois; 21 counties in Missouri. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Apr 8, 2015, 12:01 PM CDT (17:01 UTC)
Expired
Apr 8, 2015, 1:00 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 27 counties

Jackson County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 17:01 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

Springfield, MO (KSGF), launched 12:00Z, 5.0 hours before the alert went out and 284 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, Springfield, MO at 12:00Z on 2015-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2027 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, Springfield, MO at 12:00Z on 2015-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 256 square meters per square second.193958Sfc1 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
2027 J/kg
Mixed-layer CIN
-171 J/kg
Mixed-layer LCL
824 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
256 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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
Apr 8, 7:41 AM CDTMesoscale DiscussionSPCClark, Coles, Cumberland64 min
Apr 8, 12:50 PM CDTMesoscale DiscussionSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 32 more85 min
Apr 8, 1:05 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 42 more5 hr
Apr 8, 2:43 PM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 45 more92 min
Apr 8, 3:42 PM CDTMesoscale DiscussionSPCFranklin, Gallatin, Hamilton, Jackson, Jefferson, Monroe and 7 more63 min
Apr 8, 4:07 PM CDTTornado WatchSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more4 hr
Apr 7, 8:24 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Cass, Cedar, Cooper and 13 more5 hr
Apr 7, 10:13 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Henry and 6 more2 hr
Apr 8, 6:17 AM CDTMesoscale DiscussionSPCBates, Benton, Boone, Callaway, Camden, Cass and 19 more88 min
Apr 8, 6:39 AM CDTSevere Thunderstorm WatchSPCAdair, Audrain, Barton, Bates, Benton, Boone and 54 more6 hr
Apr 8, 9:33 AM CDTMesoscale DiscussionSPCAdair, Audrain, Benton, Boone, Caldwell, Callaway and 45 more57 min
Apr 8, 2:21 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 16 more114 min
Apr 8, 2:47 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more4 hr
Apr 8, 5:45 PM CDTMesoscale DiscussionSPCAudrain, Bates, Benton, Boone, Caldwell, Callaway and 39 more60 min

Nearby

Mesoscale Discussions in Missouri, 2015Mesoscale Discussions in Illinois, 2015Every mesoscale discussion in 2015

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.