Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 772

May 2, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 2, 2008, 11:05 AM CDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 2, 2008, 11:05 AM CDT (16:05 UTC)
Expired
May 2, 2008, 1:00 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 51 counties

Allamakee County, IA, Benton County, IA, Black Hawk 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, Hardin 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, Marshall County, IA, Mitchell County, IA, Muscatine County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Washington County, IA, Winneshiek County, IA, Jo Daviess County, IL, Fillmore County, MN, Houston County, MN, Mower County, MN, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI

The radar

The Quad Cities radar (KDVN), 125 km from the middle of the area, began a volume at 16:06 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, 4.1 hours before the alert went out and 128 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 2008-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1398 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 2008-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
1398 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.0

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
May 2, 5:00 AM CDTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Greene, Jersey, Pike5 hr
May 2, 9:48 AM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 13 more117 min
May 2, 10:44 AM CDTTornado WatchSPCAlexander, Edwards, Gallatin, Hamilton, Hardin, Johnson and 7 more9 hr
May 2, 12:12 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 2 more2 hr
May 2, 3:05 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, DeKalb, DeWitt and 30 more115 min
May 1, 7:24 PM CDTMesoscale DiscussionSPCDecatur, Ringgold, Wayne66 min
May 1, 7:47 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Lyon and 5 more88 min
May 1, 10:04 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Boone, Clarke, Dallas and 19 more116 min
May 1, 11:29 PM CDTMesoscale DiscussionSPCAppanoose, Clarke, Davis, Decatur, Jefferson, Keokuk and 10 more91 min
May 2, 3:47 PM CDTMesoscale DiscussionSPCAllamakee, Howard, Winneshiek118 min
May 1, 8:28 PM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Dakota and 13 more92 min
May 2, 4:31 PM CDTTornado WatchSPCAdams, Columbia, Crawford, Dane, Dodge, Grant and 14 more3 hr
May 2, 6:47 PM CDTMesoscale DiscussionSPCColumbia, Dodge, Fond du Lac, Green Lake, Jefferson, Marquette and 1 more88 min

Nearby

Mesoscale Discussions in Iowa, 2008Mesoscale Discussions in Wisconsin, 2008Mesoscale Discussions in Minnesota, 2008Every mesoscale discussion in 2008

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.