Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 1540

July 19, 200732 counties in Illinois; 21 counties in Indiana; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2007, 1:27 PM CDT for 32 counties in Illinois; 21 counties in Indiana; 7 counties in Missouri. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jul 19, 2007, 1:27 PM CDT (18:27 UTC)
Expired
Jul 19, 2007, 3:00 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 60 counties

Bond County, IL, Calhoun County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Clay County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, City of Saint Louis, MO, Franklin County, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The Evansville,IN radar (KVWX), 77 km from the middle of the area, began a volume at 18:31 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, 6.5 hours before the alert went out and 151 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 2007-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 825 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 2007-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
825 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
746 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

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 18, 7:29 PM CDTSevere Thunderstorm WatchSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more7 hr
Jul 18, 9:06 PM CDTMesoscale DiscussionSPCBureau, Carroll, Champaign, Coles, Cook, DeKalb and 38 more84 min
Jul 18, 10:23 PM CDTMesoscale DiscussionSPCMercer, Rock Island97 min
Jul 18, 11:07 PM CDTSevere Thunderstorm WatchSPCBureau, Hancock, Henderson, Henry, McDonough, Mercer and 4 more4 hr
Jul 19, 1:42 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clay, Clinton, Crawford, Edwards and 30 more6 hr
Jul 19, 5:38 PM CDTMesoscale DiscussionSPCClinton, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more97 min
Jul 19, 11:45 AM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 31 more60 min
Jul 19, 12:07 PM CDTSevere Thunderstorm WatchSPCBartholomew, Brown, Clark, Dearborn, Decatur, Fayette and 13 more8 hr

Nearby

Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Indiana, 2007Mesoscale Discussions in Missouri, 2007Every mesoscale discussion in 2007

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.