Alert archive / Michigan / Mesoscale Discussions in 2011

Mesoscale Discussion 338

April 4, 20118 counties in Illinois; 25 counties in Michigan; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 1:53 AM CDT for 8 counties in Illinois; 25 counties in Michigan; 5 counties in Wisconsin. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 1:53 AM CDT (06:53 UTC)
Expired
Apr 4, 2011, 3:30 AM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 38 counties

Cook County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, McHenry County, IL, Will County, IL, Allegan County, MI, Barry County, MI, Berrien County, MI, Calhoun County, MI, Cass County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Gladwin County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Van Buren County, MI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Grand Rapids radar (KGRR), 45 km from the middle of the area, began a volume at 06:53 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

Detroit, MI (KDTX), launched 00:00Z, 6.9 hours before the alert went out and 209 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, Detroit, MI at 00:00Z on 2011-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Detroit, MI at 00:00Z on 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1052 square meters per square second.1939587897Sfc1 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
921 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
1052 m²/s²
0-3 km storm-relative helicity
1742 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 3, 7:44 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Fulton, Hancock, Henderson and 16 more61 min
Apr 3, 8:11 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 12 more6 hr
Apr 3, 8:54 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more5 hr
Apr 3, 10:23 PM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 10 more67 min
Apr 3, 10:50 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, McDonough and 4 more85 min
Apr 4, 1:29 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 31 more91 min
Apr 4, 4:20 AM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Effingham, Jasper, Lawrence and 2 more25 min
Apr 4, 6:53 AM CDTMesoscale DiscussionSPCHardin, Lawrence, Wabash2 hr
Apr 4, 7:22 AM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more7 hr
Apr 3, 9:31 PM CDTMesoscale DiscussionSPCAllegan, Barry, Calhoun, Cass, Clare, Clinton and 20 more89 min
Apr 4, 4:30 AM CDTSevere Thunderstorm WatchSPCBranch, Hillsdale, Lenawee, Monroe8 hr

Nearby

Mesoscale Discussions in Michigan, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Wisconsin, 2011Every mesoscale discussion in 2011

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.