Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 1930

July 27, 2008Lyon County, Sioux County, Iowa; 7 counties in Minnesota; 35 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 27, 2008, 7:15 AM CDT for Lyon County, Sioux County, Iowa; 7 counties in Minnesota; 35 counties in South Dakota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jul 27, 2008, 7:15 AM CDT (12:15 UTC)
Expired
Jul 27, 2008, 8:45 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 44 counties

Lyon County, IA, Sioux County, IA, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Marshall County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 110 km from the middle of the area, began a volume at 12:17 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

Minneapolis, MN (KMPX), launched 12:00Z, 0.3 hours before the alert went out and 305 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 2008-07-27Temperature 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, Minneapolis, MN at 12:00Z on 2008-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.19395878Sfc1 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
1506 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 27, 2:25 AM CDTMesoscale DiscussionSPCLyon, O'Brien, Osceola, Sioux95 min
Jul 27, 1:02 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 47 more118 min
Jul 27, 2:29 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 64 more8 hr
Jul 27, 6:22 PM CDTMesoscale DiscussionSPCAdair, Benton, Black Hawk, Boone, Bremer, Buchanan and 51 more83 min
Jul 26, 8:51 PM CDTMesoscale DiscussionSPCAurora, Bennett, Brule, Buffalo, Charles Mix, Corson and 22 more84 min
Jul 26, 9:02 PM CDTSevere Thunderstorm WatchSPCBennett, Buffalo, Butte, Campbell, Corson, Custer and 21 more7 hr
Jul 26, 11:15 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bennett, Brule, Buffalo, Charles Mix and 34 more90 min
Jul 26, 11:34 PM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more8 hr
Jul 27, 3:14 AM CDTSevere Thunderstorm WatchSPCBrown, Buffalo, Campbell, Clark, Codington, Corson and 20 more5 hr

Nearby

Mesoscale Discussions in South Dakota, 2008Mesoscale Discussions in Minnesota, 2008Mesoscale Discussions in Iowa, 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.