Alert archive / Michigan / Mesoscale Discussions in 2014

Mesoscale Discussion 633

May 21, 201418 counties in Indiana; 31 counties in Michigan; 18 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 21, 2014, 2:56 AM EDT for 18 counties in Indiana; 31 counties in Michigan; 18 counties in Ohio. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
May 21, 2014, 2:56 AM EDT (06:56 UTC)
Expired
May 21, 2014, 4:30 AM EDT
In force
94 min
Issued by
the Storm Prediction Center
All 67 counties

Adams County, IN, Allen 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, Noble County, IN, Porter 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, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Montcalm County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Shiawassee County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Auglaize County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 93 km from the middle of the area, began a volume at 06:56 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 149 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 2014-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 82 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 2014-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 327 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
82 J/kg
Mixed-layer CIN
-322 J/kg
Mixed-layer LCL
1271 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
327 m²/s²
0-3 km storm-relative helicity
535 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.5

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 20, 9:06 PM EDTMesoscale DiscussionSPCCass, Elkhart, Fulton, Jasper, Kosciusko, Lake and 10 more84 min
May 20, 9:47 PM EDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more7 hr
May 21, 12:23 AM EDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Elkhart, Fulton, Huntington and 13 more97 min
May 21, 4:26 AM EDTMesoscale DiscussionSPCAllen, DeKalb, Elkhart, Kosciusko, LaGrange, Marshall and 4 more34 min
May 21, 12:54 PM EDTMesoscale DiscussionSPCBartholomew, Benton, Blackford, Boone, Brown, Carroll and 48 more3 hr
May 21, 1:52 PM EDTSevere Thunderstorm WatchSPCBartholomew, Boone, Brown, Carroll, Clay, Clinton and 41 more9 hr
May 21, 2:40 PM EDTMesoscale DiscussionSPCVermillion2 hr
May 21, 4:12 PM EDTMesoscale DiscussionSPCBartholomew, Benton, Blackford, Boone, Brown, Carroll and 61 more2 hr
May 21, 6:03 PM EDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more87 min
May 21, 6:28 PM EDTSevere Thunderstorm WatchSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more13 hr
May 21, 7:50 PM EDTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clay, Dearborn, Decatur and 29 more85 min

Nearby

Mesoscale Discussions in Michigan, 2014Mesoscale Discussions in Indiana, 2014Mesoscale Discussions in Ohio, 2014Every mesoscale discussion in 2014

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.