Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 911

May 19, 200522 counties in Illinois; 10 counties in Iowa; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 19, 2005, 12:41 PM CDT for 22 counties in Illinois; 10 counties in Iowa; 10 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 19, 2005, 12:41 PM CDT (17:41 UTC)
Expired
May 19, 2005, 2:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 42 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Columbia County, WI, Dane County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 77 km from the middle of the area, began a volume at 17:41 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, 5.7 hours before the alert went out and 71 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 2005-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 2005-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -44 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
4 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
996 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
-44 m²/s²
0-3 km storm-relative helicity
67 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, 6:58 AM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 34 more92 min
May 19, 10:44 AM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Crawford, Edwards, Effingham and 26 more3 hr
May 19, 11:15 AM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Clark, Clay, Clinton, Coles and 32 more8 hr
May 19, 1:25 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 25 more8 hr
May 19, 3:36 PM CDTMesoscale DiscussionSPCAlexander, Clark, Clay, Clinton, Coles, Crawford and 27 more84 min
May 19, 3:50 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more85 min
May 19, 5:59 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clark, Clay, Clinton, Coles and 30 more91 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

Nearby

Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Wisconsin, 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.