Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 2162

September 8, 200524 counties in Iowa; 12 counties in Minnesota; Brookings County, Deuel County, Hamlin County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2005, 6:08 AM CDT for 24 counties in Iowa; 12 counties in Minnesota; Brookings County, Deuel County, Hamlin County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Sep 8, 2005, 6:08 AM CDT (11:08 UTC)
Expired
Sep 8, 2005, 8:45 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 39 counties

Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Webster County, IA, Winnebago County, IA, Wright County, IA, Brown County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Watonwan County, MN, Yellow Medicine County, MN, Brookings County, SD, Deuel County, SD, Hamlin County, SD

The radar

The Sioux Falls radar (KFSD), 111 km from the middle of the area, began a volume at 11:12 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

Minneapolis, MN (KMPX), launched 00:00Z, 11.1 hours before the alert went out and 203 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, Minneapolis, MN at 00:00Z on 2005-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 00:00Z on 2005-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1193 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Sep 8, 1:59 AM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 1 more3 hr
Sep 8, 9:40 AM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Boone, Buena Vista, Butler, Calhoun and 34 more5 hr
Sep 8, 10:56 AM CDTMesoscale DiscussionSPCBoone, Calhoun, Greene, Hamilton, Hardin, Humboldt and 6 more64 min
Sep 8, 12:38 PM CDTMesoscale DiscussionSPCDes Moines, Henry, Iowa, Jasper, Jefferson, Johnson and 13 more97 min
Sep 8, 1:10 PM CDTSevere Thunderstorm WatchSPCAppanoose, Benton, Cedar, Davis, Des Moines, Henry and 15 more6 hr
Sep 8, 2:40 PM CDTMesoscale DiscussionSPCDavis, Des Moines, Henry, Jefferson, Lee, Louisa and 5 more95 min
Sep 7, 8:24 PM CDTMesoscale DiscussionSPCBuffalo, Dewey, Haakon, Hughes, Hyde, Jackson and 6 more2 hr
Sep 8, 1:59 PM CDTMesoscale DiscussionSPCBennett, Fall River, Oglala Lakota, Todd2 hr

Nearby

Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Minnesota, 2005Mesoscale Discussions in South Dakota, 2005Every mesoscale discussion in 2005

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.