Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1708

September 10, 201437 counties in Illinois; Fountain County, Vermillion County, Indiana; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2014, 1:48 PM CDT for 37 counties in Illinois; Fountain County, Vermillion County, Indiana; 7 counties in Missouri. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Sep 10, 2014, 1:48 PM CDT (18:48 UTC)
Expired
Sep 10, 2014, 3:45 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 46 counties

Bond County, IL, Calhoun County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Washington County, IL, Fountain County, IN, Vermillion County, IN, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 84 km from the middle of the area, began a volume at 18:48 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

Davenport, (KDVN), launched 12:00Z, 6.8 hours before the alert went out and 287 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, Davenport, at 12:00Z on 2014-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 68 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, Davenport, at 12:00Z on 2014-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
68 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
478 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
130 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
Sep 10, 5:02 AM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Hancock, McDonough, Menard and 4 more118 min
Sep 10, 10:34 AM CDTMesoscale DiscussionSPCClark, Coles, Douglas, Edgar, Vermilion116 min
Sep 10, 3:24 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 37 more6 hr
Sep 10, 4:36 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more84 min
Sep 10, 6:22 PM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Coles, Crawford and 19 more83 min
Sep 10, 12:54 PM CDTTornado WatchSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 51 more9 hr
Sep 10, 3:08 PM CDTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Blackford, Brown, Decatur and 24 more2 hr
Sep 10, 5:11 PM CDTMesoscale DiscussionSPCClay, Delaware, Fayette, Hamilton, Hancock, Hendricks and 13 more64 min
Sep 9, 9:00 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Caldwell, Carroll, Clinton, Daviess and 7 more90 min
Sep 9, 11:28 PM CDTMesoscale DiscussionSPCBuchanan, Caldwell, Carroll, Chariton, Clay, Clinton and 4 more32 min

Nearby

Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Missouri, 2014Mesoscale Discussions in Indiana, 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.