Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1290

July 6, 20149 counties in Illinois; 7 counties in Michigan; 7 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2014, 11:11 PM CDT for 9 counties in Illinois; 7 counties in Michigan; 7 counties in Wisconsin. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2014, 11:11 PM CDT (04:11 UTC)
Expired: Jul 7, 2014, 12:15 AM CDT
In force: 64 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 23 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Allegan County, MI, Barry County, MI, Berrien County, MI, Cass County, MI, Kalamazoo County, MI, Ottawa County, MI, Van Buren County, MI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 102 km from the middle of the area, began a volume at 04:11 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 4.2 hours before the alert went out and 222 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: 1828 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 588 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.7

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 7, 1:45 PM CDT	Mesoscale Discussion	SPC	Bond, Clark, Clay, Clinton, Crawford, Cumberland and 21 more	90 min
Jul 7, 6:01 PM CDT	Mesoscale Discussion	SPC	Monroe	59 min
Jul 7, 1:53 PM CDT	Mesoscale Discussion	SPC	Adams, Barron, Buffalo, Burnett, Chippewa, Clark and 18 more	97 min
Jul 7, 4:47 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Columbia, Crawford, Dane, Dodge and 17 more	88 min
Jul 7, 5:12 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Columbia, Crawford, Dane, Grant and 15 more	7 hr

Nearby

Mesoscale Discussions in Illinois, 2014 Mesoscale Discussions in Michigan, 2014 Mesoscale Discussions in Wisconsin, 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.