Alert archive / Iowa / Mesoscale Discussions in 2006

Mesoscale Discussion 1876

August 24, 200626 counties in Iowa; 16 counties in Minnesota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 24, 2006, 9:08 PM CDT for 26 counties in Iowa; 16 counties in Minnesota; 10 counties in South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Aug 24, 2006, 9:08 PM CDT (02:08 UTC)
Expired
Aug 24, 2006, 10:45 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 52 counties

Allamakee County, IA, Buena Vista County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Lyon County, IA, Mitchell County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sioux County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Cottonwood County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Watonwan County, MN, Winona County, MN, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 126 km from the middle of the area, began a volume at 02:09 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

Omaha, NE (KOAX), launched 00:00Z, 2.1 hours before the alert went out and 269 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, Omaha, NE at 00:00Z on 2006-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4514 joules per kilogram.LCLEL10008507005003002001001 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, Omaha, NE at 00:00Z on 2006-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
4514 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1351 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
1.1
Supercell composite
9.7

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
Aug 24, 11:24 PM CDTMesoscale DiscussionSPCAllamakee, Chickasaw, Clay, Clayton, Dickinson, Emmet and 8 more96 min
Aug 24, 11:52 PM CDTSevere Thunderstorm WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more6 hr
Aug 25, 2:27 AM CDTMesoscale DiscussionSPCAllamakee, Chickasaw, Clayton, Dubuque, Fayette, Floyd and 3 more2 hr
Aug 25, 5:05 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Buchanan, Clayton, Delaware, Dubuque and 5 more55 min
Aug 25, 1:42 PM CDTMesoscale DiscussionSPCScott2 hr
Aug 25, 6:38 PM CDTMesoscale DiscussionSPCClinton, Jackson2 hr

Nearby

Mesoscale Discussions in Iowa, 2006Mesoscale Discussions in Minnesota, 2006Mesoscale Discussions in South Dakota, 2006Every mesoscale discussion in 2006

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.