Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1240

June 21, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 3:15 PM CDT for 4 states. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2007, 3:15 PM CDT (20:15 UTC)
Expired
Jun 21, 2007, 3:45 PM CDT
In force
30 min
Issued by
the Storm Prediction Center
All 46 counties

Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Boyd County, NE, Dakota County, NE, Dixon County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 26 km from the middle of the area, began a volume at 20:15 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, 8.3 hours before the alert went out and 203 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 2007-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 245 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 2007-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 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
245 J/kg
Mixed-layer CIN
-388 J/kg
Mixed-layer LCL
1393 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

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
Jun 20, 11:30 PM CDTMesoscale DiscussionSPCHoward, Mitchell, Winnebago, Worth90 min
Jun 21, 4:27 AM CDTSevere Thunderstorm WatchSPCAllamakee, Howard, Mitchell, Winneshiek8 hr
Jun 21, 9:10 AM CDTMesoscale DiscussionSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux35 min
Jun 21, 9:38 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more6 hr
Jun 21, 9:57 AM CDTMesoscale DiscussionSPCAllamakee, Cedar, Clayton, Clinton, Delaware, Des Moines and 10 more33 min
Jun 21, 11:55 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 16 more50 min
Jun 21, 11:59 AM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more8 hr
Jun 21, 2:13 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 50 more62 min
Jun 21, 3:25 PM CDTMesoscale DiscussionSPCAdair, Allamakee, Audubon, Benton, Black Hawk, Boone and 52 more35 min
Jun 21, 3:55 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Cass, Cedar, Clarke and 26 more3 hr
Jun 21, 5:42 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Cedar and 25 more93 min
Jun 21, 6:47 PM CDTSevere Thunderstorm WatchSPCAppanoose, Cedar, Clayton, Clinton, Davis, Delaware and 18 more4 hr
Jun 20, 8:28 PM CDTMesoscale DiscussionSPCBlue Earth, Dodge, Goodhue, Le Sueur, Olmsted, Rice and 2 more92 min
Jun 21, 2:10 AM CDTMesoscale DiscussionSPCBig Stone, Lac qui Parle, Stevens, Traverse, Yellow Medicine95 min
Jun 21, 2:29 AM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse, Wilkin8 hr
Jun 21, 3:55 AM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 32 more95 min
Jun 21, 7:14 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Chippewa, Cottonwood, Faribault, Jackson and 11 more91 min
Jun 21, 11:08 AM CDTMesoscale DiscussionSPCAnoka, Benton, Brown, Carver, Chippewa, Dakota and 25 more67 min
Jun 21, 3:40 PM CDTMesoscale DiscussionSPCArthur, Chase, Cherry, Cheyenne, Deuel, Dundy and 11 more95 min
Jun 21, 4:37 PM CDTTornado WatchSPCArthur, Blaine, Box Butte, Brown, Chase, Cherry and 23 more7 hr
Jun 21, 6:33 PM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Buffalo, Custer, Dawson and 19 more87 min
Jun 21, 5:34 AM CDTMesoscale DiscussionSPCBrown, Campbell, Clark, Codington, Corson, Day and 10 more86 min
Jun 21, 2:43 PM CDTMesoscale DiscussionSPCCorson, Dewey, Harding, Meade, Perkins, Ziebach92 min

Nearby

Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Minnesota, 2007Every mesoscale discussion in 2007

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.