Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 330

April 12, 20145 states

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2014, 11:26 PM CDT for 5 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 12, 2014, 11:26 PM CDT (04:26 UTC)
Expired: Apr 13, 2014, 12:30 AM CDT
In force: 64 min
Issued by: the Storm Prediction Center

All 95 counties

Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Cedar County, IA, Clarke County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Boone County, IL, Carroll County, IL, Jo Daviess County, IL, McHenry County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Atchison County, KS, Brown County, KS, Doniphan County, KS, Adair County, MO, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 70 km from the middle of the area, began a volume at 04:26 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 00:00Z, 4.4 hours before the alert went out and 76 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: 661 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1978 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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
Apr 12, 9:08 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Jo Daviess, McHenry, Ogle, Stephenson and 1 more	67 min
Apr 12, 9:38 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Carroll, Jo Daviess, Lake, McHenry, Ogle and 4 more	6 hr
Apr 13, 1:37 AM CDT	Mesoscale Discussion	SPC	Boone, Carroll, DeKalb, Jo Daviess, Lee, McHenry and 5 more	83 min
Apr 13, 7:41 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Greene, Hancock, Henderson and 5 more	2 hr
Apr 12, 9:12 PM CDT	Mesoscale Discussion	SPC	Decatur, Page, Ringgold, Taylor	63 min
Apr 13, 1:16 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Carroll, Cherokee, Crawford, Harrison, Ida and 7 more	6 hr
Apr 13, 11:10 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Brown, Butler, Chase and 27 more	3 hr
Apr 13, 12:02 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Atchison, Brown, Butler, Chase and 34 more	7 hr
Apr 13, 2:32 PM CDT	Mesoscale Discussion	SPC	Atchison, Coffey, Doniphan, Douglas, Elk, Franklin and 7 more	88 min
Apr 13, 4:13 PM CDT	Mesoscale Discussion	SPC	Cherokee	32 min
Apr 13, 4:27 PM CDT	Severe Thunderstorm Watch	SPC	Bourbon, Cherokee, Crawford	7 hr
Apr 13, 6:01 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Boone, Callaway and 41 more	59 min

Nearby

Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Missouri, 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.