Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1799

July 30, 201144 counties in Minnesota; 10 counties in North Dakota; 19 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2011, 3:22 PM CDT for 44 counties in Minnesota; 10 counties in North Dakota; 19 counties in South Dakota. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jul 30, 2011, 3:22 PM CDT (20:22 UTC)
Expired
Jul 30, 2011, 4:15 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 73 counties

Becker County, MN, Beltrami County, MN, Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Clay County, MN, Clearwater County, MN, Cottonwood County, MN, Grant County, MN, Hubbard County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Mahnomen County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Pipestone County, MN, Polk County, MN, Pope County, MN, Red Lake County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Waseca County, MN, Watonwan County, MN, Wilkin County, MN, Wright County, MN, Yellow Medicine County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Griggs County, ND, LaMoure County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Beadle County, SD, Brookings County, SD, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McPherson County, SD, Miner County, SD, Moody County, SD, Roberts County, SD, Spink County, SD

The radar

The Minneapolis radar (KMPX), 207 km from the middle of the area, began a volume at 20:23 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 12:00Z, 8.4 hours before the alert went out and 205 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 2011-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2252 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 2011-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
2252 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
813 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.9

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 30, 5:47 AM CDTMesoscale DiscussionSPCBig Stone, Brown, Chippewa, Kandiyohi, Lac qui Parle, Lincoln and 9 more88 min
Jul 30, 11:28 AM CDTMesoscale DiscussionSPCAnoka, Benton, Brown, Carver, Chippewa, Chisago and 24 more3 hr
Jul 30, 1:28 PM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Brown, Carver, Chippewa, Chisago and 32 more112 min
Jul 30, 5:31 PM CDTSevere Thunderstorm WatchSPCAitkin, Anoka, Benton, Big Stone, Brown, Carlton and 41 more7 hr
Jul 29, 9:06 PM CDTMesoscale DiscussionSPCAdams, Bowman, Emmons, Grant, Hettinger, McIntosh and 2 more54 min
Jul 29, 10:14 PM CDTMesoscale DiscussionSPCBillings, Bottineau, Burke, Burleigh, Divide, Dunn and 12 more61 min
Jul 29, 11:52 PM CDTMesoscale DiscussionSPCBarnes, Benson, Billings, Bottineau, Burleigh, Dickey and 23 more83 min

Nearby

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