Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1461

July 1, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2011, 12:59 PM CDT for 4 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Jul 1, 2011, 12:59 PM CDT (17:59 UTC)
Expired
Jul 1, 2011, 2:00 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
All 58 counties

Dickinson County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Big Stone County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Stevens County, MN, Swift County, MN, Watonwan County, MN, Yellow Medicine County, MN, Boyd County, NE, Cedar County, NE, Knox County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings 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, 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, 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), 57 km from the middle of the area, began a volume at 18:00 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 12:00Z, 6.0 hours before the alert went out and 162 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 2011-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 407 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 2011-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -270 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
407 J/kg
Mixed-layer CIN
-374 J/kg
Mixed-layer LCL
983 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
-270 m²/s²
0-3 km storm-relative helicity
-229 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 1, 2:08 PM CDTSevere Thunderstorm WatchSPCLyon9 hr
Jul 1, 5:03 PM CDTMesoscale DiscussionSPCAnoka, Benton, Carver, Chisago, Dakota, Hennepin and 14 more57 min
Jul 1, 6:36 PM CDTMesoscale DiscussionSPCAitkin, Anoka, Benton, Blue Earth, Brown, Carlton and 34 more114 min
Jun 30, 8:25 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 15 more2 hr
Jul 1, 3:47 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 6 more58 min
Jun 30, 9:58 PM CDTMesoscale DiscussionSPCBeadle, Brule, Buffalo, Hughes, Jerauld, Jones and 4 more32 min
Jun 30, 10:07 PM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Brule, Buffalo, Clark, Codington and 16 more3 hr

Nearby

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