Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 915

May 19, 2005Clay County, Craighead County, Greene County, Arkansas; 33 counties in Illinois; 15 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 19, 2005, 3:36 PM CDT for Clay County, Craighead County, Greene County, Arkansas; 33 counties in Illinois; 15 counties in Missouri. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
May 19, 2005, 3:36 PM CDT (20:36 UTC)
Expired
May 19, 2005, 5:00 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 51 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Alexander County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Iron County, MO, Madison County, MO, New Madrid County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Evansville,IN radar (KVWX), 108 km from the middle of the area, began a volume at 20:40 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, 8.6 hours before the alert went out and 193 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 2005-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 35 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 2005-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 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
35 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
199 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
May 19, 10:44 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Fulton, Madison and 2 more3 hr
May 19, 11:15 AM CDTSevere Thunderstorm WatchSPCClay, Craighead, Greene, Lawrence, Poinsett, Randolph8 hr
May 19, 5:59 PM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Lawrence, Poinsett, Randolph91 min
May 19, 6:58 AM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 34 more92 min
May 19, 12:41 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Henry and 16 more2 hr
May 19, 1:25 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 25 more8 hr
May 19, 3:50 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more85 min
May 19, 6:20 PM CDTSevere Thunderstorm WatchSPCBond, Cass, Champaign, Christian, Clay, Clinton and 40 more6 hr
May 19, 6:30 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more90 min
May 18, 7:55 PM CDTMesoscale DiscussionSPCJackson35 min

Nearby

Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Missouri, 2005Mesoscale Discussions in Arkansas, 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.