Alert archive / Iowa / Mesoscale Discussions in 2010

Mesoscale Discussion 239

April 2, 20104 states

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2010, 11:35 AM CDT for 4 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2010, 11:35 AM CDT (16:35 UTC)
Expired
Apr 2, 2010, 1:00 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 50 counties

Allamakee County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Howard 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, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Winneshiek County, IA, Jo Daviess County, IL, Mercer County, IL, Rock Island County, IL, Fillmore County, MN, Houston County, MN, Crawford County, WI, Grant County, WI

The radar

The Quad Cities radar (KDVN), 137 km from the middle of the area, began a volume at 16:37 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, 4.6 hours before the alert went out and 142 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 2010-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2010-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1723 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
239 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.

IssuedProductOfficeCountiesLasted
Apr 1, 11:31 PM CDTMesoscale DiscussionSPCLyon, O'Brien, Osceola, Plymouth, Sioux, Woodbury89 min
Apr 2, 8:28 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Dallas, Davis and 25 more92 min
Apr 2, 10:25 AM CDTSevere Thunderstorm WatchSPCAppanoose, Davis, Jasper, Lucas, Mahaska, Marion and 6 more3 hr
Apr 2, 12:59 PM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Buchanan, Chickasaw, Clayton, Delaware and 6 more117 min

Nearby

Mesoscale Discussions in Iowa, 2010Mesoscale Discussions in Illinois, 2010Mesoscale Discussions in Minnesota, 2010Every mesoscale discussion in 2010

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.