Alert archive / Indiana / Mesoscale Discussions in 2015

Mesoscale Discussion 1472

July 18, 201511 counties in Indiana; Branch County, Hillsdale County, Michigan; 4 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2015, 8:03 PM EDT for 11 counties in Indiana; Branch County, Hillsdale County, Michigan; 4 counties in Ohio. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2015, 8:03 PM EDT (00:03 UTC)
Expired: Jul 18, 2015, 9:00 PM EDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Adams County, IN, Allen County, IN, DeKalb County, IN, Huntington County, IN, Kosciusko County, IN, LaGrange County, IN, Noble County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Branch County, MI, Hillsdale County, MI, Defiance County, OH, Paulding County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 38 km from the middle of the area, began a volume at 00:04 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, 0.1 hours before the alert went out and 220 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: 343 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 1592 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Jul 19, 1:29 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Brown, Butler, Clark, Clermont and 24 more	91 min
Jul 19, 2:11 PM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Carroll, Champaign, Columbiana, Coshocton and 31 more	2 hr
Jul 19, 3:18 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Belmont, Carroll, Columbiana, Coshocton and 27 more	7 hr

Nearby

Mesoscale Discussions in Indiana, 2015 Mesoscale Discussions in Ohio, 2015 Mesoscale Discussions in Michigan, 2015 Every mesoscale discussion in 2015

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.