Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1809

August 1, 201117 counties in Minnesota; 7 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2011, 2:31 AM CDT for 17 counties in Minnesota; 7 counties in North Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Aug 1, 2011, 2:31 AM CDT (07:31 UTC)
Expired
Aug 1, 2011, 4:00 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 24 counties

Becker County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Douglas County, MN, Hubbard County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Todd County, MN, Wadena County, MN, Wilkin County, MN, Cass County, ND, Grand Forks County, ND, Griggs County, ND, Nelson County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 73 km from the middle of the area, began a volume at 07:30 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

International Fa, MN (KINL), launched 00:00Z, 7.5 hours before the alert went out and 276 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, International Fa, MN at 00:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, International Fa, MN at 00:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2453 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, 4:57 AM CDTSevere Thunderstorm WatchSPCBecker, Benton, Big Stone, Brown, Cass, Chippewa and 28 more7 hr
Aug 1, 7:31 AM CDTMesoscale DiscussionSPCAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 33 more89 min
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
Jul 31, 8:16 PM CDTMesoscale DiscussionSPCAdams, Grant, Morton, Sioux89 min
Aug 1, 1:33 PM CDTMesoscale DiscussionSPCAdams, Burleigh, Emmons, Grant, Hettinger, Kidder and 10 more57 min
Aug 1, 2:19 PM CDTSevere Thunderstorm WatchSPCAdams, Bowman, Burleigh, Emmons, Grant, Hettinger and 10 more6 hr
Aug 1, 5:57 PM CDTMesoscale DiscussionSPCAdams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more2 hr
Aug 1, 6:10 PM CDTMesoscale DiscussionSPCAdams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more2 hr

Nearby

Mesoscale Discussions in Minnesota, 2011Mesoscale Discussions in North Dakota, 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.