Alert archive / Wisconsin / Mesoscale Discussions in 2013

Mesoscale Discussion 879

May 30, 20134 counties in Iowa; Houston County, Winona County, Minnesota; 34 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 1:33 PM CDT for 4 counties in Iowa; Houston County, Winona County, Minnesota; 34 counties in Wisconsin. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 30, 2013, 1:33 PM CDT (18:33 UTC)
Expired
May 30, 2013, 2:30 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 40 counties

Allamakee County, IA, Clayton County, IA, Fayette County, IA, Winneshiek County, IA, Houston County, MN, Winona County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Eau Claire County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Monroe County, WI, Oneida County, WI, Pepin County, WI, Portage County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Sauk County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 34 km from the middle of the area, began a volume at 18:34 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.6 hours before the alert went out and 224 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, Green Bay/Straub, WI at 12:00Z on 2013-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 422 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, Green Bay/Straub, WI at 12:00Z on 2013-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 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
422 J/kg
Mixed-layer CIN
-145 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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 29, 9:00 PM CDTMesoscale DiscussionSPCAllamakee, Appanoose, Benton, Buchanan, Clayton, Davis and 16 more60 min
May 29, 9:36 PM CDTMesoscale DiscussionSPCAdair, Buena Vista, Calhoun, Carroll, Clay, Emmet and 6 more54 min
May 30, 11:20 AM CDTMesoscale DiscussionSPCAllamakee, Buchanan, Clayton, Delaware, Dubuque, Fayette and 2 more115 min
May 30, 11:29 AM CDTMesoscale DiscussionSPCDes Moines, Henry, Lee, Louisa, Muscatine, Scott61 min
May 30, 11:56 AM CDTTornado WatchSPCAllamakee, Clayton, Fayette, Winneshiek7 hr
May 30, 12:32 PM CDTTornado WatchSPCBenton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more7 hr
May 30, 2:16 PM CDTMesoscale DiscussionSPCBuchanan, Cedar, Clinton, Delaware, Des Moines, Dubuque and 12 more59 min
May 30, 3:34 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek116 min
May 30, 3:52 PM CDTMesoscale DiscussionSPCBuchanan, Cedar, Clinton, Delaware, Des Moines, Dubuque and 12 more113 min
May 30, 5:58 PM CDTMesoscale DiscussionSPCClayton62 min
May 30, 6:40 PM CDTTornado WatchSPCAdams, Brown, Calumet, Clark, Columbia, Dane and 40 more3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2013Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Minnesota, 2013Every mesoscale discussion in 2013

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.