Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 878

May 22, 201120 counties in Indiana; 11 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 10:59 PM EDT for 20 counties in Indiana; 11 counties in Michigan. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
May 22, 2011, 10:59 PM EDT (02:59 UTC)
Expired
May 23, 2011, 12:00 AM EDT
In force
61 min
Issued by
the Storm Prediction Center
All 31 counties

Allen County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Ionia County, MI, Kalamazoo County, MI, Kent County, MI, Saint Joseph County, MI, Van Buren County, MI

The radar

The Northern Indiana radar (KIWX), 72 km from the middle of the area, began a volume at 03:00 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 nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 3.0 hours before the alert went out and 199 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 2011-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1371 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, Detroit, MI at 00:00Z on 2011-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 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
1371 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1412 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.9

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 22, 8:20 PM EDTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 33 more115 min
May 22, 10:35 PM EDTMesoscale DiscussionSPCLake55 min
May 22, 11:24 PM EDTMesoscale DiscussionSPCVermillion, Vigo66 min
May 23, 4:20 AM EDTMesoscale DiscussionSPCClark, Floyd, Harrison, Jefferson, Ohio, Scott and 1 more85 min
May 23, 8:25 AM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 36 more65 min
May 23, 11:55 AM EDTSevere Thunderstorm WatchSPCGibson, Pike, Posey, Spencer, Vanderburgh, Warrick7 hr
May 23, 12:35 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 13 more85 min
May 23, 1:37 PM EDTMesoscale DiscussionSPCClay, Daviess, Gibson, Greene, Knox, Pike and 6 more83 min
May 23, 1:54 PM EDTSevere Thunderstorm WatchSPCBartholomew, Boone, Brown, Carroll, Clay, Clinton and 33 more5 hr
May 23, 2:15 PM EDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 15 more8 hr
May 23, 3:52 PM EDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 42 more53 min
May 23, 4:28 PM EDTSevere Thunderstorm WatchSPCClark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more6 hr
May 23, 4:58 PM EDTMesoscale DiscussionSPCGibson, Pike, Posey, Spencer, Vanderburgh, Warrick92 min
May 23, 6:20 PM EDTMesoscale DiscussionSPCClark, Crawford, Dearborn, Decatur, Fayette, Floyd and 15 more55 min
May 23, 6:40 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Grant, Howard and 8 more65 min
May 22, 8:09 PM EDTMesoscale DiscussionSPCAntrim, Crawford, Grand Traverse, Kalkaska, Lake, Missaukee and 3 more96 min
May 22, 8:42 PM EDTMesoscale DiscussionSPCDickinson, Iron63 min

Nearby

Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Michigan, 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.