Alert archive / Illinois / Mesoscale Discussions in 2010

Mesoscale Discussion 1349

July 18, 20104 states

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2010, 9:21 AM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jul 18, 2010, 9:21 AM CDT (14:21 UTC)
Expired
Jul 18, 2010, 10:45 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 23 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Union County, KY, Bollinger County, MO, Cape Girardeau County, MO, Mississippi County, MO, Scott County, MO

The radar

The Paducah radar (KPAH), 68 km from the middle of the area, began a volume at 14:20 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, 2.4 hours before the alert went out and 282 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 2010-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3619 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 2010-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
3619 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
775 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

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
Jul 17, 11:59 PM CDTMesoscale DiscussionSPCJo Daviess, Stephenson91 min
Jul 18, 3:05 AM CDTSevere Thunderstorm WatchSPCAdams, Brown, Hancock, Henderson, McDonough, Pike and 1 more5 hr
Jul 18, 4:58 AM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Pike62 min
Jul 18, 5:58 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 36 more32 min
Jul 18, 6:22 AM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Cass, Champaign, Christian, Clay and 33 more5 hr
Jul 18, 7:19 AM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Henderson, McDonough, Pike and 1 more26 min
Jul 18, 11:52 AM CDTMesoscale DiscussionSPCBenton, Carroll, Cass, Elkhart, Fountain, Fulton and 13 more113 min
Jul 18, 12:47 PM CDTSevere Thunderstorm WatchSPCAllen, Benton, Cass, DeKalb, Elkhart, Fulton and 18 more10 hr
Jul 18, 3:48 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Grant, Huntington and 8 more87 min
Jul 18, 1:50 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clinton, Daviess and 6 more55 min
Jul 18, 2:31 AM CDTMesoscale DiscussionSPCAtchison, Holt, Nodaway, Worth59 min
Jul 18, 8:58 AM CDTSevere Thunderstorm WatchSPCCamden, Dallas, Dent, Howell, Laclede, Maries and 8 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2010Mesoscale Discussions in Missouri, 2010Mesoscale Discussions in Indiana, 2010Every mesoscale discussion in 2010

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.