Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1812

August 1, 201139 counties in Minnesota; Pierce County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2011, 7:31 AM CDT for 39 counties in Minnesota; Pierce County, Wisconsin. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Aug 1, 2011, 7:31 AM CDT (12:31 UTC)
Expired
Aug 1, 2011, 9:00 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 40 counties

Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Dakota County, MN, Dodge County, MN, Douglas County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Grant County, MN, Hennepin County, MN, Kandiyohi County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Olmsted County, MN, Otter Tail County, MN, Pope County, MN, Ramsey County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wilkin County, MN, Wright County, MN, Pierce County, WI

The radar

The Minneapolis radar (KMPX), 91 km from the middle of the area, began a volume at 12:33 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

Minneapolis, MN (KMPX), launched 12:00Z, 0.5 hours before the alert went out and 88 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 12:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2974 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, Minneapolis, MN at 12:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
2974 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
898 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

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
Jul 31, 10:26 PM CDTSevere Thunderstorm WatchSPCBecker, Clay, Clearwater, Grant, Kittson, Mahnomen and 8 more8 hr
Aug 1, 12:35 AM CDTMesoscale DiscussionSPCClay, Norman, Polk85 min
Aug 1, 2:31 AM CDTMesoscale DiscussionSPCBecker, Cass, Clay, Clearwater, Crow Wing, Douglas and 11 more89 min
Aug 1, 4:57 AM CDTSevere Thunderstorm WatchSPCBecker, Benton, Big Stone, Brown, Cass, Chippewa and 28 more7 hr
Aug 1, 10:42 AM CDTMesoscale DiscussionSPCBenton, Kandiyohi, Meeker, Mille Lacs, Morrison, Pope and 5 more63 min
Aug 1, 11:29 AM CDTMesoscale DiscussionSPCAnoka, Benton, Carver, Chisago, Dakota, Hennepin and 8 more31 min
Aug 1, 11:52 AM CDTSevere Thunderstorm WatchSPCAnoka, Becker, Benton, Big Stone, Blue Earth, Brown and 43 more7 hr
Aug 1, 1:50 PM CDTMesoscale DiscussionSPCBlue Earth, Dakota, Dodge, Fillmore, Freeborn, Goodhue and 12 more25 min
Aug 1, 2:04 PM CDTSevere Thunderstorm WatchSPCDodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more5 hr
Aug 1, 3:53 PM CDTMesoscale DiscussionSPCAnoka, Becker, Benton, Blue Earth, Carver, Chippewa and 47 more67 min

Nearby

Mesoscale Discussions in Minnesota, 2011Mesoscale Discussions in Wisconsin, 2011Every mesoscale discussion in 2011

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.