Alert archive / Wisconsin / Mesoscale Discussions in 2013

Mesoscale Discussion 875

May 30, 20134 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 11:20 AM CDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 30, 2013, 11:20 AM CDT (16:20 UTC)
Expired
May 30, 2013, 1:15 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 37 counties

Allamakee County, IA, Buchanan County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Winneshiek County, IA, Jo Daviess County, IL, Stephenson County, IL, Fillmore County, MN, Houston County, MN, Winona County, MN, Adams County, WI, Buffalo 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, Marathon County, WI, Marquette County, WI, Monroe County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 40 km from the middle of the area, began a volume at 16:22 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, 4.3 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, Davenport, at 12:00Z on 2013-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 378 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 2013-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 127 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
378 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
920 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
127 m²/s²
0-3 km storm-relative helicity
141 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 30, 11:29 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 47 more61 min
May 30, 12:32 PM CDTTornado WatchSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 57 more7 hr
May 30, 2:16 PM CDTMesoscale DiscussionSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 53 more59 min
May 30, 3:52 PM CDTMesoscale DiscussionSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 56 more113 min
May 30, 5:48 PM CDTSevere Thunderstorm WatchSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more6 hr
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, 11:56 AM CDTTornado WatchSPCAllamakee, Clayton, Fayette, Winneshiek7 hr
May 30, 1:33 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek57 min
May 30, 3:34 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek116 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.