Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 650

April 22, 200521 counties in Illinois; 18 counties in Indiana; 7 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 10:56 AM CDT for 21 counties in Illinois; 18 counties in Indiana; 7 counties in Kentucky. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 10:56 AM CDT (15:56 UTC)
Expired
Apr 22, 2005, 12:30 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 46 counties

Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Gallatin County, IL, Jasper County, IL, Lawrence County, IL, Macon County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Clay County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warrick County, IN, Daviess County, KY, Hancock County, KY, Henderson County, KY, McLean County, KY, Ohio County, KY, Union County, KY, Webster County, KY

The radar

The Evansville,IN radar (KVWX), 38 km from the middle of the area, began a volume at 16:00 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, 3.9 hours before the alert went out and 186 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 2005-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2005-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
677 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
125 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
Apr 21, 8:03 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Franklin, Hamilton, Jefferson and 10 more87 min
Apr 21, 8:19 PM CDTMesoscale DiscussionSPCAlexander, Johnson, Massac, Pope, Pulaski, Saline and 1 more86 min
Apr 21, 10:25 PM CDTMesoscale DiscussionSPCCalhoun, Jersey, Madison, Monroe, Randolph, Saint Clair65 min
Apr 21, 11:50 PM CDTSevere Thunderstorm WatchSPCClinton, Edwards, Franklin, Hamilton, Jackson, Jefferson and 9 more6 hr
Apr 22, 3:09 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more66 min
Apr 22, 1:30 PM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 19 more8 hr
Apr 22, 3:17 PM CDTMesoscale DiscussionSPCDearborn, Fayette, Franklin, Jay, Ohio, Randolph and 3 more88 min
Apr 22, 3:50 PM CDTSevere Thunderstorm WatchSPCDearborn, Fayette, Franklin, Henry, Ohio, Ripley and 4 more7 hr
Apr 22, 5:11 PM CDTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clark, Clay, Crawford and 36 more94 min
Apr 22, 5:36 AM CDTMesoscale DiscussionSPCAllen, Logan, Simpson, Todd84 min

Nearby

Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Indiana, 2005Mesoscale Discussions in Kentucky, 2005Every mesoscale discussion in 2005

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.