Alert archive / South Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 803

May 25, 20134 states

The Storm Prediction Center issued this mesoscale discussion at May 25, 2013, 10:59 PM CDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
May 25, 2013, 10:59 PM CDT (03:59 UTC)
Expired
May 26, 2013, 12:30 AM CDT
In force
91 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 52 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sac County, IA, Sioux County, IA, Woodbury County, IA, Rock County, MN, Cedar County, NE, Dakota County, NE, Dixon County, NE, Knox County, NE, Thurston County, NE, Wayne County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clay County, SD, Corson County, SD, Davison County, SD, Dewey County, SD, Douglas County, SD, Faulk County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Perkins County, SD, Potter County, SD, Sanborn County, SD, Stanley County, SD, Sully County, SD, Turner County, SD, Union County, SD, Walworth County, SD, Yankton County, SD, Ziebach County, SD

The radar

The Aberdeen radar (KABR), 156 km from the middle of the area, began a volume at 04:01 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, 4.0 hours before the alert went out and 103 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 2013-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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 2013-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
2 J/kg
Mixed-layer CIN
-560 J/kg
Mixed-layer LCL
1028 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
May 26, 6:47 PM CDTMesoscale DiscussionSPCAdams, Cass, Clarke, Decatur, Fremont, Mills and 7 more88 min
May 25, 7:36 PM CDTSevere Thunderstorm WatchSPCAdams, Blaine, Buffalo, Custer, Dawson, Franklin and 16 more4 hr
May 25, 9:43 PM CDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Buffalo, Butler and 35 more92 min
May 26, 3:03 PM CDTMesoscale DiscussionSPCArthur, Blaine, Buffalo, Custer, Dawson, Garden and 8 more87 min
May 26, 3:49 PM CDTMesoscale DiscussionSPCBanner, Kimball, Scotts Bluff, Sioux56 min
May 26, 6:55 PM CDTMesoscale DiscussionSPCAdams, Blaine, Boone, Buffalo, Butler, Clay and 27 more2 hr
May 25, 8:48 PM CDTMesoscale DiscussionSPCBuffalo, Butte, Campbell, Corson, Dewey, Haakon and 16 more87 min
May 26, 1:17 AM CDTSevere Thunderstorm WatchSPCBuffalo, Corson, Dewey, Edmunds, Faulk, Haakon and 12 more5 hr
May 26, 3:24 AM CDTMesoscale DiscussionSPCBeadle, Brule, Buffalo, Corson, Dewey, Faulk and 10 more96 min

Nearby

Mesoscale Discussions in South Dakota, 2013Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Nebraska, 2013Every mesoscale discussion in 2013

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.