Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 1285

June 8, 2008Mercer County, Rock Island County, Illinois; 21 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2008, 4:32 PM CDT for Mercer County, Rock Island County, Illinois; 21 counties in Iowa. It was in force for 28 min.

The area

The outline as issued.

The facts

Issued
Jun 8, 2008, 4:32 PM CDT (21:32 UTC)
Expired
Jun 8, 2008, 5:00 PM CDT
In force
28 min
Issued by
the Storm Prediction Center
All 23 counties

Benton County, IA, Buchanan County, IA, Cedar 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, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Wapello County, IA, Washington County, IA, Mercer County, IL, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 69 km from the middle of the area, began a volume at 21:33 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, 9.5 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 2008-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1677 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 2008-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 261 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
1677 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
813 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
261 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
2.5
Supercell composite
9.8

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 7, 7:40 PM CDTTornado WatchSPCBoone, Carroll, Jo Daviess, McHenry, Stephenson, Winnebago7 hr
Jun 8, 3:05 AM CDTSevere Thunderstorm WatchSPCRock Island6 hr
Jun 8, 6:39 AM CDTMesoscale DiscussionSPCMercer, Rock Island66 min
Jun 8, 8:43 AM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Kane and 9 more62 min
Jun 8, 9:47 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 17 more5 hr
Jun 8, 2:04 PM CDTMesoscale DiscussionSPCGrundy, Kankakee, Kendall, LaSalle, Will116 min
Jun 8, 4:43 PM CDTTornado WatchSPCCarroll, Henderson, Henry, Jo Daviess, Mercer, Rock Island and 3 more6 hr
Jun 8, 5:36 PM CDTSevere Thunderstorm WatchSPCAdams, Hancock, McDonough6 hr
Jun 7, 10:15 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 12 more90 min
Jun 7, 11:01 PM CDTMesoscale DiscussionSPCMonona, Woodbury59 min
Jun 7, 11:11 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Harrison, Ida, Mills and 8 more7 hr
Jun 8, 2:29 AM CDTMesoscale DiscussionSPCAdair, Adams, Allamakee, Audubon, Benton, Black Hawk and 58 more31 min
Jun 8, 12:28 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 26 more2 hr
Jun 8, 1:21 PM CDTTornado WatchSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 21 more7 hr
Jun 8, 1:34 PM CDTSevere Thunderstorm WatchSPCFremont, Montgomery, Page7 hr
Jun 8, 3:47 PM CDTMesoscale DiscussionSPCAdair, Adams, Boone, Clarke, Dallas, Decatur and 18 more118 min

Nearby

Mesoscale Discussions in Iowa, 2008Mesoscale Discussions in Illinois, 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.