Alert archive / Wisconsin / Mesoscale Discussions in 2006

Mesoscale Discussion 1271

June 21, 20064 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2006, 10:32 AM CDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2006, 10:32 AM CDT (15:32 UTC)
Expired
Jun 21, 2006, 12:30 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 29 counties

Allamakee County, IA, Buchanan County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Winneshiek County, IA, Boone County, IL, Jo Daviess County, IL, McHenry County, IL, Stephenson County, IL, Winnebago County, IL, Houston County, MN, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Marquette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 125 km from the middle of the area, began a volume at 15:34 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, 3.5 hours before the alert went out and 141 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 2006-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1472 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 2006-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 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
1472 J/kg
Mixed-layer CIN
-118 J/kg
Mixed-layer LCL
939 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.1

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
Jun 21, 1:49 AM CDTMesoscale DiscussionSPCHancock86 min
Jun 21, 6:27 AM CDTMesoscale DiscussionSPCAdams, Boone, Brown, Bureau, Carroll, Cass and 41 more2 hr
Jun 21, 10:56 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more7 hr
Jun 21, 12:19 PM CDTMesoscale DiscussionSPCMercer, Rock Island86 min
Jun 21, 2:28 PM CDTMesoscale DiscussionSPCChampaign, Cook, DuPage, Ford, Grundy, Iroquois and 11 more92 min
Jun 21, 5:24 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 23 more36 min
Jun 21, 5:43 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Fulton and 18 more111 min
Jun 20, 10:22 PM CDTSevere Thunderstorm WatchSPCFremont, Harrison, Mills, Montgomery, Pottawattamie, Shelby5 hr
Jun 21, 8:32 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 20 more88 min
Jun 21, 8:42 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more7 hr
Jun 21, 11:22 AM CDTMesoscale DiscussionSPCCook, Lake83 min
Jun 21, 1:06 PM CDTMesoscale DiscussionSPCAshland, Chippewa, Clark, Eau Claire, Florence, Forest and 14 more84 min
Jun 21, 1:28 PM CDTSevere Thunderstorm WatchSPCAshland, Bayfield, Brown, Chippewa, Clark, Door and 24 more7 hr
Jun 21, 4:38 PM CDTMesoscale DiscussionSPCBrown, Door, Florence, Forest, Kewaunee, Langlade and 7 more97 min

Nearby

Mesoscale Discussions in Wisconsin, 2006Mesoscale Discussions in Iowa, 2006Mesoscale Discussions in Illinois, 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.