Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 1971

July 31, 20086 counties in Minnesota; 7 counties in North Dakota; 25 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2008, 3:30 AM CDT for 6 counties in Minnesota; 7 counties in North Dakota; 25 counties in South Dakota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jul 31, 2008, 3:30 AM CDT (08:30 UTC)
Expired
Jul 31, 2008, 5:00 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 38 counties

Big Stone County, MN, Lac qui Parle County, MN, Lincoln County, MN, Pipestone County, MN, Rock County, MN, Yellow Medicine County, MN, Dickey County, ND, Emmons County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Sargent County, ND, Sioux County, ND, Beadle County, SD, Brookings County, SD, Brown County, SD, Campbell 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, Hand County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McPherson County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 3 km from the middle of the area, began a volume at 08:33 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

Aberdeen, SD (KABR), launched 00:00Z, 8.5 hours before the alert went out and 63 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 00:00Z on 2008-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1719 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 00:00Z on 2008-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
1719 J/kg
Mixed-layer CIN
-151 J/kg
Mixed-layer LCL
1514 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.2
Supercell composite
10.9

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 31, 12:50 AM CDTMesoscale DiscussionSPCBig Stone, Chippewa, Lac qui Parle, Lincoln, Lyon, Murray and 9 more85 min
Jul 31, 1:23 AM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse5 hr
Jul 31, 4:51 AM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 30 more4 hr
Jul 31, 5:28 AM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Chippewa, Cottonwood, Faribault and 17 more92 min
Jul 31, 6:50 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 35 more85 min
Jul 31, 7:18 AM CDTSevere Thunderstorm WatchSPCCottonwood, Dodge, Fillmore, Houston, Jackson, Mower and 6 more6 hr
Jul 31, 8:03 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 26 more87 min
Jul 31, 10:28 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 26 more92 min
Jul 30, 7:04 PM CDTMesoscale DiscussionSPCBurke, Burleigh, Emmons, Grant, Kidder, Logan and 11 more56 min
Jul 30, 9:42 PM CDTMesoscale DiscussionSPCBarnes, Benson, Bottineau, Burleigh, Cavalier, Eddy and 17 more93 min
Jul 30, 10:04 PM CDTSevere Thunderstorm WatchSPCAdams, Barnes, Benson, Bottineau, Burke, Burleigh and 34 more7 hr

Nearby

Mesoscale Discussions in South Dakota, 2008Mesoscale Discussions in North Dakota, 2008Mesoscale Discussions in Minnesota, 2008Every mesoscale discussion in 2008

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.