Alert archive / Indiana / Mesoscale Discussions in 2014

Mesoscale Discussion 634

May 21, 201410 counties in Indiana; 5 counties in Michigan; 8 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 21, 2014, 4:26 AM EDT for 10 counties in Indiana; 5 counties in Michigan; 8 counties in Ohio. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued: May 21, 2014, 4:26 AM EDT (08:26 UTC)
Expired: May 21, 2014, 5:00 AM EDT
In force: 34 min
Issued by: the Storm Prediction Center

All 23 counties

Allen County, IN, DeKalb County, IN, Elkhart County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Noble County, IN, Saint Joseph County, IN, Steuben County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Cass County, MI, Hillsdale County, MI, Saint Joseph County, MI, Allen County, OH, Defiance County, OH, Fulton County, OH, Henry County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 25 km from the middle of the area, began a volume at 08:28 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, 8.4 hours before the alert went out and 217 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

Issued	Product	Office	Counties	Lasted
May 20, 9:06 PM EDT	Mesoscale Discussion	SPC	Cass, Elkhart, Fulton, Jasper, Kosciusko, Lake and 10 more	84 min
May 20, 9:47 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	7 hr
May 21, 12:23 AM EDT	Mesoscale Discussion	SPC	Adams, Allen, DeKalb, Elkhart, Fulton, Huntington and 13 more	97 min
May 21, 2:56 AM EDT	Mesoscale Discussion	SPC	Adams, Allen, DeKalb, Elkhart, Fulton, Huntington and 12 more	94 min
May 21, 12:54 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Benton, Blackford, Boone, Brown, Carroll and 48 more	3 hr
May 21, 1:52 PM EDT	Severe Thunderstorm Watch	SPC	Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 41 more	9 hr
May 21, 2:40 PM EDT	Mesoscale Discussion	SPC	Vermillion	2 hr
May 21, 4:12 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Benton, Blackford, Boone, Brown, Carroll and 61 more	2 hr
May 21, 6:03 PM EDT	Mesoscale Discussion	SPC	Clark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more	87 min
May 21, 6:28 PM EDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more	13 hr
May 21, 7:50 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Boone, Brown, Clay, Dearborn, Decatur and 29 more	85 min

Nearby

Mesoscale Discussions in Indiana, 2014 Mesoscale Discussions in Ohio, 2014 Mesoscale Discussions in Michigan, 2014 Every 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.