Alert archive / Iowa / Mesoscale Discussions in 2016

Mesoscale Discussion 917

June 14, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2016, 3:49 PM CDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Jun 14, 2016, 3:49 PM CDT (20:49 UTC)
Expired
Jun 14, 2016, 4:45 PM CDT
In force
56 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 50 counties

Allamakee County, IA, Benton County, IA, Black Hawk 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, Howard County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Mitchell County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Washington County, IA, Winneshiek County, IA, Henry County, IL, Jo Daviess County, IL, Mercer County, IL, Rock Island County, IL, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Crawford County, WI, Grant County, WI, Iowa County, WI, Jackson County, WI, La Crosse County, WI, Lafayette County, WI, Monroe County, WI, Pepin County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 88 km from the middle of the area, began a volume at 20:52 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.8 hours before the alert went out and 182 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2016-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 569 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2016-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
569 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
989 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Jun 14, 4:03 PM CDTSevere Thunderstorm WatchSPCCarroll, Jo Daviess, Stephenson7 hr
Jun 14, 6:24 PM CDTMesoscale DiscussionSPCCarroll, Henry, Jo Daviess, Rock Island, Whiteside66 min
Jun 14, 11:45 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Black Hawk, Boone and 57 more2 hr
Jun 14, 12:43 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Black Hawk, Boone, Bremer and 52 more8 hr
Jun 14, 2:51 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Black Hawk, Boone and 59 more114 min
Jun 14, 6:15 PM CDTMesoscale DiscussionSPCTaylor3 hr
Jun 14, 2:33 PM CDTTornado WatchSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 32 more5 hr
Jun 14, 5:16 PM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Carver, Chippewa, Dakota, Faribault and 20 more59 min

Nearby

Mesoscale Discussions in Iowa, 2016Mesoscale Discussions in Wisconsin, 2016Mesoscale Discussions in Minnesota, 2016Every mesoscale discussion in 2016

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.