Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1074

June 18, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2014, 8:47 PM CDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Jun 18, 2014, 8:47 PM CDT (01:47 UTC)
Expired
Jun 18, 2014, 10:15 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
All 64 counties

Dickinson County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Big Stone County, MN, Chippewa County, MN, Grant County, MN, Jackson County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Wilkin County, MN, Yellow Medicine County, MN, Barnes County, ND, Dickey County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Stutsman County, ND, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brown County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Edmunds County, SD, Faulk 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, McPherson County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Turner County, SD, Yankton County, SD

The radar

The Aberdeen radar (KABR), 101 km from the middle of the area, began a volume at 01:50 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, 1.8 hours before the alert went out and 52 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 2014-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1475 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 2014-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 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
1475 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
1398 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
228 m²/s²
Significant tornado parameter
0.7
Supercell composite
7.6

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 19, 1:15 AM CDTMesoscale DiscussionSPCLyon, Plymouth, Sioux, Woodbury90 min
Jun 19, 1:31 AM CDTSevere Thunderstorm WatchSPCLyon, O'Brien, Osceola, Plymouth, Sioux3 hr
Jun 19, 3:15 AM CDTMesoscale DiscussionSPCLyon, Plymouth, Sioux, Woodbury90 min
Jun 19, 1:10 PM CDTMesoscale DiscussionSPCAudubon, Buena Vista, Calhoun, Carroll, Cass, Clay and 15 more95 min
Jun 19, 2:02 PM CDTMesoscale DiscussionSPCKossuth, Winnebago, Worth88 min
Jun 19, 2:40 PM CDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Dubuque, Jackson, Jones and 4 more65 min
Jun 18, 9:42 PM CDTMesoscale DiscussionSPCBlue Earth, Brown, Chippewa, Clay, Cottonwood, Douglas and 22 more3 hr
Jun 18, 10:09 PM CDTTornado WatchSPCBig Stone, Blue Earth, Brown, Chippewa, Cottonwood, Faribault and 20 more5 hr
Jun 19, 1:32 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Carver, Chippewa, Faribault, Freeborn and 16 more58 min
Jun 18, 7:37 PM CDTTornado WatchSPCDickey, LaMoure, Ransom, Richland, Sargent6 hr
Jun 19, 2:37 PM CDTMesoscale DiscussionSPCButte, Corson, Dewey, Haakon, Harding, Jackson and 8 more53 min

Nearby

Mesoscale Discussions in South Dakota, 2014Mesoscale Discussions in Minnesota, 2014Mesoscale Discussions in North Dakota, 2014Every mesoscale discussion in 2014

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.