Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 1041

May 25, 200811 counties in Illinois; 14 counties in Iowa; Clark County, Scotland County, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 25, 2008, 11:28 PM CDT for 11 counties in Illinois; 14 counties in Iowa; Clark County, Scotland County, Missouri. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
May 25, 2008, 11:28 PM CDT (04:28 UTC)
Expired
May 26, 2008, 12:30 AM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 27 counties

Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Lee County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 32 km from the middle of the area, began a volume at 04:31 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 00:00Z, 4.5 hours before the alert went out and 35 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 00:00Z on 2008-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1867 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 00:00Z on 2008-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 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
1867 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
1008 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
1.2
Supercell composite
6.1

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 25, 7:54 PM CDTTornado WatchSPCBoone, Bureau, Carroll, DeKalb, Hancock, Henderson and 13 more6 hr
May 25, 9:23 PM CDTMesoscale DiscussionSPCBoone, Carroll, DeKalb, Henry, Jo Daviess, Kane and 8 more67 min
May 25, 9:30 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clark, Clay, Clinton, Coles and 19 more4 hr
May 25, 10:18 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clark, Clay, Clinton, Crawford and 30 more117 min
May 25, 10:59 PM CDTMesoscale DiscussionSPCBrown, Cass, Champaign, Cook, DeWitt, DuPage and 28 more61 min
May 25, 11:55 PM CDTSevere Thunderstorm WatchSPCCook, DuPage, Ford, Fulton, Grundy, Iroquois and 13 more5 hr
May 26, 3:13 AM CDTMesoscale DiscussionSPCFord, Iroquois62 min
May 25, 7:12 PM CDTTornado WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more4 hr
May 25, 8:07 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 9 more113 min
May 25, 8:46 PM CDTTornado WatchSPCAdair, Andrew, Atchison, Bates, Buchanan, Caldwell and 31 more3 hr
May 25, 11:21 PM CDTSevere Thunderstorm WatchSPCAdair, Barton, Bates, Benton, Carroll, Cass and 26 more6 hr
May 26, 12:10 AM CDTMesoscale DiscussionSPCAdair, Barton, Bates, Benton, Carroll, Cass and 21 more95 min
May 26, 2:42 AM CDTMesoscale DiscussionSPCAudrain, Barton, Benton, Boone, Callaway, Camden and 18 more93 min
May 26, 12:10 PM CDTMesoscale DiscussionSPCPemiscot65 min
May 26, 5:14 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot3 hr

Nearby

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