Alert archive / Iowa / Mesoscale Discussions in 2013

Mesoscale Discussion 1041

June 12, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2013, 12:49 PM CDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2013, 12:49 PM CDT (17:49 UTC)
Expired
Jun 12, 2013, 1:45 PM CDT
In force
56 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 45 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Marshall County, IA, Mitchell County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Carroll County, IL, Jo Daviess County, IL, Rock Island County, IL, Whiteside County, IL, Fillmore County, MN, Crawford County, WI, Grant County, WI, Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 114 km from the middle of the area, began a volume at 17:47 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, 5.8 hours before the alert went out and 118 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 2013-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1812 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 2013-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.19395878Sfc1 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
1812 J/kg
Mixed-layer CIN
-167 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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.

IssuedProductOfficeCountiesLasted
Jun 12, 10:26 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more64 min
Jun 12, 1:49 PM CDTTornado Watch PDSSPCBoone, Bureau, Carroll, DeKalb, Grundy, Henry and 13 more9 hr
Jun 12, 3:38 PM CDTMesoscale DiscussionSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 4 more97 min
Jun 12, 4:00 PM CDTSevere Thunderstorm Watch PDSSPCCook, DuPage, Ford, Iroquois, Kankakee, Lake and 1 more9 hr
Jun 12, 4:06 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Grundy, Henry and 12 more54 min
Jun 12, 5:56 PM CDTMesoscale DiscussionSPCCook, DeKalb, DuPage, Ford, Grundy, Iroquois and 8 more94 min
Jun 12, 6:40 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 17 more95 min
Jun 11, 11:12 PM CDTMesoscale DiscussionSPCCherokee, Clay, Dickinson, Ida, Lyon, O'Brien and 4 more2 hr
Jun 12, 4:37 AM CDTMesoscale DiscussionSPCBig Stone, Chippewa, Kandiyohi, Lac qui Parle, Lincoln, Lyon and 11 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Wisconsin, 2013Every mesoscale discussion in 2013

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.