Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 565

May 11, 2014Mercer County, Illinois; 11 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at May 11, 2014, 2:36 PM CDT for Mercer County, Illinois; 11 counties in Iowa. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 11, 2014, 2:36 PM CDT (19:36 UTC)
Expired: May 11, 2014, 4:00 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Mahaska County, IA, Muscatine County, IA, Wapello County, IA, Washington County, IA, Mercer County, IL

The radar

The Quad Cities radar (KDVN), 109 km from the middle of the area, began a volume at 19:36 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

Davenport, (KDVN), launched 12:00Z, 7.6 hours before the alert went out and 115 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: 52 J/kg
Mixed-layer CIN: -261 J/kg
Mixed-layer LCL: 1382 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 10, 7:55 PM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 2 more	95 min
May 10, 10:22 PM CDT	Mesoscale Discussion	SPC	Calhoun, Jersey, Madison, Monroe, Randolph, Saint Clair	83 min
May 11, 9:16 AM CDT	Mesoscale Discussion	SPC	Mercer, Rock Island	89 min
May 11, 10:47 AM CDT	Mesoscale Discussion	SPC	Hancock	118 min
May 11, 11:53 AM CDT	Tornado Watch	SPC	Carroll, Henderson, Henry, Mercer, Rock Island, Warren and 1 more	7 hr
May 11, 12:51 PM CDT	Mesoscale Discussion	SPC	Carroll, Henderson, Jo Daviess, Mercer, Rock Island, Whiteside	54 min
May 11, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more	7 hr
May 11, 5:09 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more	66 min
May 11, 5:49 PM CDT	Mesoscale Discussion	SPC	Clark, Coles, Edgar	56 min
May 11, 1:19 AM CDT	Mesoscale Discussion	SPC	Adams, Cass, Fremont, Harrison, Mills, Montgomery and 3 more	2 hr
May 11, 2:58 AM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie	7 hr
May 11, 7:02 AM CDT	Mesoscale Discussion	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie	118 min
May 11, 12:49 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Fremont, Mills, Montgomery, Page and 2 more	116 min
May 11, 2:21 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Cass, Fremont, Harrison and 8 more	8 hr
May 11, 6:23 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Fremont, Mills, Montgomery and 5 more	67 min

Nearby

Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Illinois, 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.