Alert archive / Iowa / Mesoscale Discussions in 2019

Mesoscale Discussion 2049

October 1, 201914 counties in Illinois; 21 counties in Iowa; 17 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Oct 1, 2019, 5:03 PM CDT for 14 counties in Illinois; 21 counties in Iowa; 17 counties in Wisconsin. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Oct 1, 2019, 5:03 PM CDT (22:03 UTC)
Expired: Oct 1, 2019, 7:00 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 52 counties

Allamakee County, IA, Benton County, IA, Bremer County, IA, Buchanan County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Winneshiek County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Henry County, IL, Jo Daviess County, IL, Lee County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Marquette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 108 km from the middle of the area, began a volume at 22:03 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 671Oct 1, 6:05 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.1 hours before the alert went out and 108 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: 616 J/kg
Mixed-layer CIN: -161 J/kg
Mixed-layer LCL: 1038 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
Oct 1, 10:18 AM CDT	Mesoscale Discussion	SPC	Boone, McHenry, Winnebago	2 hr
Oct 1, 6:05 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Carroll, Jo Daviess, Ogle, Stephenson, Winnebago	6 hr
Oct 1, 2:08 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Fremont, Madison, Montgomery and 3 more	67 min
Oct 1, 2:45 PM CDT	Tornado Watch	SPC	Adair, Adams, Black Hawk, Boone, Bremer, Cass and 25 more	7 hr
Oct 1, 3:24 PM CDT	Mesoscale Discussion	SPC	Adams, Montgomery, Page	66 min
Oct 1, 6:05 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Benton, Black Hawk, Clarke, Decatur and 13 more	85 min
Sep 30, 8:33 PM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Chippewa, Dunn, Pepin, Pierce and 3 more	57 min

Nearby

Mesoscale Discussions in Iowa, 2019 Mesoscale Discussions in Wisconsin, 2019 Mesoscale Discussions in Illinois, 2019 Every mesoscale discussion in 2019

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.