Alert archive / Minnesota / Mesoscale Discussions in 2012

Mesoscale Discussion 1584

July 25, 201220 counties in Minnesota; 6 counties in North Dakota; 11 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2012, 1:56 PM CDT for 20 counties in Minnesota; 6 counties in North Dakota; 11 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 25, 2012, 1:56 PM CDT (18:56 UTC)
Expired
Jul 25, 2012, 4:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 37 counties

Becker County, MN, Beltrami County, MN, Big Stone County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Hubbard County, MN, Kittson County, MN, Lake of the Woods 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, Roseau County, MN, Stevens County, MN, Traverse County, MN, Wilkin County, MN, Cass County, ND, Grand Forks County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Traill County, ND, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Marshall County, SD, Potter County, SD, Roberts County, SD, Spink County, SD

The radar

The Fargo/Grand Forks radar (KMVX), 121 km from the middle of the area, began a volume at 18:58 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

Aberdeen, SD (KABR), launched 12:00Z, 6.9 hours before the alert went out and 208 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, Aberdeen, SD at 12:00Z on 2012-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1286 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, Aberdeen, SD at 12:00Z on 2012-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -197 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
1286 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
794 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-197 m²/s²
0-3 km storm-relative helicity
-14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 24, 9:08 PM CDTSevere Thunderstorm WatchSPCBecker, Cass, Clay, Crow Wing, Douglas, Grant and 8 more7 hr
Jul 24, 11:24 PM CDTMesoscale DiscussionSPCAitkin, Becker, Benton, Big Stone, Cass, Clay and 20 more96 min
Jul 25, 2:05 AM CDTMesoscale DiscussionSPCAitkin, Carlton, Cass, Crow Wing, Pine55 min
Jul 25, 2:24 AM CDTSevere Thunderstorm WatchSPCAitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 13 more5 hr
Jul 25, 3:41 AM CDTMesoscale DiscussionSPCBecker, Clay, Grant, Hubbard, Mahnomen, Otter Tail and 2 more34 min
Jul 25, 5:24 AM CDTMesoscale DiscussionSPCAitkin, Benton, Big Stone, Carlton, Cass, Chisago and 20 more66 min
Jul 25, 5:16 PM CDTSevere Thunderstorm WatchSPCBlue Earth, Dodge, Faribault, Fillmore, Freeborn, Goodhue and 11 more8 hr
Jul 24, 8:01 PM CDTSevere Thunderstorm WatchSPCAdams, Billings, Bowman, Burleigh, Dickey, Dunn and 19 more7 hr
Jul 25, 2:52 PM CDTMesoscale DiscussionSPCBon Homme, Clay, Hutchinson, Turner, Union, Yankton113 min

Nearby

Mesoscale Discussions in Minnesota, 2012Mesoscale Discussions in South Dakota, 2012Mesoscale Discussions in North Dakota, 2012Every mesoscale discussion in 2012

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.