Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1641

July 17, 201124 counties in Minnesota; 7 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2011, 1:42 PM CDT for 24 counties in Minnesota; 7 counties in North Dakota. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jul 17, 2011, 1:42 PM CDT (18:42 UTC)
Expired
Jul 17, 2011, 3:15 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 31 counties

Aitkin County, MN, Becker County, MN, Beltrami County, MN, Benton County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Douglas County, MN, Hubbard County, MN, Itasca County, MN, Kanabec County, MN, Mahnomen County, MN, Mille Lacs County, MN, Morrison County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Stearns County, MN, Todd County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Grand Forks County, ND, Griggs County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 105 km from the middle of the area, began a volume at 18:42 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 12:00Z, 6.7 hours before the alert went out and 273 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 12:00Z on 2011-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1146 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, International Fa, MN at 12:00Z on 2011-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 167 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
1146 J/kg
Mixed-layer CIN
-217 J/kg
Mixed-layer LCL
1112 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
167 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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 16, 9:25 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Kittson, Lake of the Woods and 7 more95 min
Jul 16, 11:37 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 9 more23 min
Jul 17, 9:15 AM CDTMesoscale DiscussionSPCBecker, Clay, Clearwater, Kittson, Mahnomen, Marshall and 4 more2 hr
Jul 17, 9:58 AM CDTSevere Thunderstorm WatchSPCBecker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 8 more7 hr
Jul 17, 10:24 AM CDTMesoscale DiscussionSPCBecker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 5 more66 min
Jul 17, 12:49 PM CDTTornado WatchSPCBecker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 3 more3 hr
Jul 17, 3:37 PM CDTTornado WatchSPCBecker, Clay, Grant, Otter Tail, Wadena, Wilkin6 hr
Jul 17, 4:34 PM CDTSevere Thunderstorm WatchSPCAitkin, Benton, Carlton, Cass, Chippewa, Cook and 19 more7 hr
Jul 17, 6:34 PM CDTMesoscale DiscussionSPCBig Stone, Traverse56 min
Jul 17, 11:01 AM CDTMesoscale DiscussionSPCBenson, Eddy, Foster, Grand Forks, Nelson, Ramsey89 min

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.