Alert archive / South Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1230

June 20, 2012Lac qui Parle County, Minnesota; 14 counties in Nebraska; 16 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2012, 4:00 AM CDT for Lac qui Parle County, Minnesota; 14 counties in Nebraska; 16 counties in South Dakota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jun 20, 2012, 4:00 AM CDT (09:00 UTC)
Expired
Jun 20, 2012, 5:00 AM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 31 counties

Lac qui Parle County, MN, Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Gregory County, SD, Hamlin County, SD, Hanson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Miner County, SD, Sanborn County, SD

The radar

The North Platte radar (KLNX), 170 km from the middle of the area, began a volume at 09:02 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 00:00Z, 9.0 hours before the alert went out and 204 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 2012-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 322 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 2012-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
322 J/kg
Mixed-layer CIN
-368 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
206 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.2

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 19, 7:01 PM CDTSevere Thunderstorm WatchSPCCottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more7 hr
Jun 19, 9:12 PM CDTMesoscale DiscussionSPCAnoka, Benton, Big Stone, Chippewa, Chisago, Douglas and 22 more93 min
Jun 19, 9:17 PM CDTMesoscale DiscussionSPCAitkin, Becker, Cass, Clay, Crow Wing, Hubbard and 7 more88 min
Jun 19, 11:20 PM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse5 hr
Jun 19, 11:37 PM CDTMesoscale DiscussionSPCAitkin, Benton, Big Stone, Carlton, Cass, Chippewa and 22 more83 min
Jun 20, 5:27 AM CDTMesoscale DiscussionSPCAitkin, Carlton, Crow Wing, Mille Lacs, Morrison2 hr
Jun 20, 9:40 AM CDTMesoscale DiscussionSPCAnoka, Benton, Chisago, Isanti, Kanabec, Mille Lacs and 3 more95 min
Jun 20, 2:10 PM CDTMesoscale DiscussionSPCBlue Earth, Dakota, Dodge, Faribault, Fillmore, Freeborn and 11 more95 min
Jun 19, 8:50 PM CDTMesoscale DiscussionSPCArthur, Box Butte, Cherry, Dawes, Garden, Grant and 7 more85 min
Jun 19, 11:59 PM CDTMesoscale DiscussionSPCBox Butte, Dawes, Garden, Grant, Morrill, Sheridan91 min
Jun 20, 12:57 AM CDTSevere Thunderstorm WatchSPCBlaine, Boyd, Brown, Cherry, Garden, Grant and 7 more3 hr
Jun 20, 3:24 PM CDTMesoscale DiscussionSPCAdams, Burt, Butler, Cass, Clay, Dodge and 21 more96 min

Nearby

Mesoscale Discussions in South Dakota, 2012Mesoscale Discussions in Nebraska, 2012Mesoscale Discussions in Minnesota, 2012Every mesoscale discussion in 2012

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.