Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 1720

August 11, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2007, 12:58 AM CDT for 4 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Aug 11, 2007, 12:58 AM CDT (05:58 UTC)
Expired
Aug 11, 2007, 2:00 AM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 51 counties

Anoka County, MN, Benton County, MN, Big Stone County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Dakota County, MN, Douglas County, MN, Goodhue County, MN, Grant County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Nicollet County, MN, Pine County, MN, Pope County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Washington County, MN, Wright County, MN, Yellow Medicine County, MN, Dickey County, ND, Brown County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD, Burnett County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 185 km from the middle of the area, began a volume at 05:59 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, 6.0 hours before the alert went out and 183 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 2007-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 639 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 00:00Z on 2007-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
639 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1768 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
13 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Aug 11, 1:31 AM CDTSevere Thunderstorm WatchSPCAnoka, Benton, Brown, Carver, Chippewa, Chisago and 27 more4 hr
Aug 11, 3:00 AM CDTMesoscale DiscussionSPCAnoka, Benton, Blue Earth, Brown, Carver, Chisago and 26 more60 min
Aug 11, 5:15 AM CDTMesoscale DiscussionSPCGoodhue, Le Sueur, Rice, Wabasha, Winona30 min
Aug 11, 3:01 PM CDTMesoscale DiscussionSPCBlue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 33 more89 min
Aug 11, 6:21 PM CDTSevere Thunderstorm WatchSPCAitkin, Anoka, Blue Earth, Brown, Carlton, Carver and 27 more6 hr
Aug 11, 6:31 PM CDTMesoscale DiscussionSPCCook, Lake119 min
Aug 10, 8:50 PM CDTMesoscale DiscussionSPCDickey, McIntosh55 min
Aug 10, 10:08 PM CDTMesoscale DiscussionSPCBurke, Burleigh, Divide, McLean, Mountrail, Oliver and 4 more67 min
Aug 11, 12:27 AM CDTMesoscale DiscussionSPCBottineau, McHenry, Pierce, Renville, Ward33 min
Aug 11, 2:37 AM CDTMesoscale DiscussionSPCBarnes, Benson, Burleigh, Cass, Dickey, Eddy and 23 more23 min

Nearby

Mesoscale Discussions in Minnesota, 2007Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Wisconsin, 2007Every mesoscale discussion in 2007

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.