Alert archive / Indiana / Mesoscale Discussions in 2017

Mesoscale Discussion 229

February 28, 201711 counties in Illinois; 12 counties in Indiana; Bollinger County, Cape Girardeau County, Perry County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2017, 10:09 PM CST for 11 counties in Illinois; 12 counties in Indiana; Bollinger County, Cape Girardeau County, Perry County, Missouri. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Feb 28, 2017, 10:09 PM CST (04:09 UTC)
Expired: Feb 28, 2017, 11:15 PM CST
In force: 66 min
Issued by: the Storm Prediction Center

All 26 counties

Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Jackson County, IL, Johnson County, IL, Saline County, IL, Union County, IL, Wabash County, IL, White County, IL, Williamson County, IL, Crawford County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Orange County, IN, Pike County, IN, Posey County, IN, Vanderburgh County, IN, Warrick County, IN, Bollinger County, MO, Cape Girardeau County, MO, Perry County, MO

The radar

The Evansville,IN radar (KVWX), 83 km from the middle of the area, began a volume at 04:12 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

Lincoln, IL (KILX), launched 00:00Z, 4.2 hours before the alert went out and 255 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: 687 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 395 m²/s²
0-3 km storm-relative helicity: 431 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 7:46 PM CST	Mesoscale Discussion	SPC	Alexander, Clay, Crawford, Edwards, Franklin, Gallatin and 21 more	119 min
Feb 28, 8:06 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Champaign, Christian and 37 more	84 min
Feb 28, 8:29 PM CST	Tornado Watch	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	12 hr
Feb 28, 9:04 PM CST	Tornado Watch	SPC	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	7 hr
Feb 28, 9:51 PM CST	Tornado Watch	SPC	Cass, Champaign, Christian, Clark, Clay, Coles and 37 more	6 hr
Feb 28, 11:52 PM CST	Mesoscale Discussion	SPC	Champaign, Ford, Iroquois, Vermilion	53 min
Mar 1, 2:09 AM CST	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 8 more	2 hr
Mar 1, 3:03 AM CST	Tornado Watch	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	5 hr
Mar 1, 4:19 AM CST	Mesoscale Discussion	SPC	Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 3 more	56 min
Feb 28, 6:00 PM CST	Mesoscale Discussion	SPC	Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 14 more	90 min
Feb 28, 6:37 PM CST	Severe Thunderstorm Watch	SPC	Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 8 more	8 hr
Feb 28, 8:41 PM CST	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 9 more	94 min
Feb 28, 10:03 PM CST	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Blackford, Boone, Carroll and 48 more	117 min
Feb 28, 10:29 PM CST	Tornado Watch	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 41 more	8 hr
Mar 1, 12:44 AM CST	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 28 more	61 min
Mar 1, 1:32 AM CST	Mesoscale Discussion	SPC	Clark, Crawford, Dearborn, Dubois, Floyd, Harrison and 11 more	88 min
Mar 1, 4:57 AM CST	Tornado Watch	SPC	Clark, Crawford, Dearborn, Dubois, Floyd, Franklin and 9 more	5 hr
Feb 28, 6:05 PM CST	Mesoscale Discussion	SPC	Adair, Audrain, Barton, Bates, Benton, Boone and 39 more	115 min
Feb 28, 6:23 PM CST	Tornado Watch	SPC	Adair, Bates, Carroll, Cass, Chariton, Cooper and 15 more	5 hr
Feb 28, 10:01 PM CST	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 14 more	119 min
Mar 1, 12:16 AM CST	Mesoscale Discussion	SPC	Barton, Camden, Cedar, Christian, Cole, Crawford and 28 more	89 min

Nearby

Mesoscale Discussions in Indiana, 2017 Mesoscale Discussions in Illinois, 2017 Mesoscale Discussions in Missouri, 2017 Every mesoscale discussion in 2017

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.