Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1244

June 21, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 5:42 PM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2007, 5:42 PM CDT (22:42 UTC)
Expired
Jun 21, 2007, 7:15 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 60 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, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa 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, Bureau County, IL, Carroll County, IL, Fulton County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Houston County, MN, Crawford County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Vernon County, WI

The radar

The Quad Cities radar (KDVN), 71 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 75 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 2007-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 683 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 2007-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.193958Sfc1 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
683 J/kg
Mixed-layer CIN
-148 J/kg
Mixed-layer LCL
1072 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 21, 9:57 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, Cook, DeKalb and 42 more33 min
Jun 21, 12:27 PM CDTMesoscale DiscussionSPCBoone, Carroll, DeKalb, Jo Daviess, Kane, McHenry and 3 more63 min
Jun 21, 3:25 PM CDTMesoscale DiscussionSPCJo Daviess35 min
Jun 21, 3:55 PM CDTSevere Thunderstorm WatchSPCHenderson, Mercer, Rock Island, Warren3 hr
Jun 21, 6:47 PM CDTSevere Thunderstorm WatchSPCCarroll, Hancock, Henderson, Henry, Jo Daviess, Knox and 6 more4 hr
Jun 20, 11:30 PM CDTMesoscale DiscussionSPCHoward, Mitchell, Winnebago, Worth90 min
Jun 21, 4:27 AM CDTSevere Thunderstorm WatchSPCAllamakee, Howard, Mitchell, Winneshiek8 hr
Jun 21, 9:10 AM CDTMesoscale DiscussionSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux35 min
Jun 21, 9:38 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more6 hr
Jun 21, 11:55 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 16 more50 min
Jun 21, 11:59 AM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more8 hr
Jun 21, 2:13 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 50 more62 min
Jun 21, 3:15 PM CDTMesoscale DiscussionSPCCherokee, Clay, Dickinson, Ida, Lyon, O'Brien and 4 more30 min
Jun 20, 8:28 PM CDTMesoscale DiscussionSPCBlue Earth, Dodge, Goodhue, Le Sueur, Olmsted, Rice and 2 more92 min
Jun 21, 2:10 AM CDTMesoscale DiscussionSPCBig Stone, Lac qui Parle, Stevens, Traverse, Yellow Medicine95 min
Jun 21, 2:29 AM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse, Wilkin8 hr
Jun 21, 3:55 AM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 32 more95 min
Jun 21, 7:14 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Chippewa, Cottonwood, Faribault, Jackson and 11 more91 min
Jun 21, 11:08 AM CDTMesoscale DiscussionSPCAnoka, Benton, Brown, Carver, Chippewa, Dakota and 25 more67 min
Jun 20, 7:25 PM CDTMesoscale DiscussionSPCAdams, Barron, Buffalo, Chippewa, Clark, Dunn and 18 more95 min

Nearby

Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Wisconsin, 2007Every mesoscale discussion in 2007

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.