Alert archive / Illinois / Mesoscale Discussions in 2009

Mesoscale Discussion 1313

June 25, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2009, 12:14 PM CDT for 4 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Jun 25, 2009, 12:14 PM CDT (17:14 UTC)
Expired
Jun 25, 2009, 1:15 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
All 59 counties

Allamakee 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, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Mitchell County, IA, Muscatine County, IA, Scott County, IA, Winneshiek County, IA, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Crawford County, WI, Grant County, WI, Lafayette County, WI, Richland County, WI, Vernon County, WI

The radar

The Quad Cities radar (KDVN), 42 km from the middle of the area, began a volume at 17:14 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, 5.2 hours before the alert went out and 48 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 2009-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2414 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 2009-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
2414 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
795 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.9
Supercell composite
6.8

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 25, 12:48 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Fulton, Hancock, Henderson, Henry and 19 more6 hr
Jun 25, 2:56 PM CDTMesoscale DiscussionSPCBureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 15 more64 min
Jun 25, 3:57 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more5 hr
Jun 25, 5:36 PM CDTMesoscale DiscussionSPCBureau, Carroll, Fulton, Hancock, Henderson, Henry and 13 more84 min
Jun 24, 10:53 PM CDTMesoscale DiscussionSPCPlymouth, Sioux97 min
Jun 24, 11:53 PM CDTSevere Thunderstorm WatchSPCCherokee, Harrison, Lyon, Monona, O'Brien, Plymouth and 2 more5 hr
Jun 25, 3:32 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Clarke, Decatur and 14 more88 min
Jun 24, 8:49 PM CDTMesoscale DiscussionSPCLincoln, Pipestone, Rock86 min

Nearby

Mesoscale Discussions in Illinois, 2009Mesoscale Discussions in Iowa, 2009Mesoscale Discussions in Minnesota, 2009Every mesoscale discussion in 2009

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.