Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1708

August 10, 20076 counties in Nebraska; 24 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2007, 10:45 AM CDT for 6 counties in Nebraska; 24 counties in South Dakota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Aug 10, 2007, 10:45 AM CDT (15:45 UTC)
Expired
Aug 10, 2007, 12:15 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 30 counties

Boyd County, NE, Brown County, NE, Cherry County, NE, Grant County, NE, Keya Paha County, NE, Rock 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, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 173 km from the middle of the area, began a volume at 15:49 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, 3.8 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 2007-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 492 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 2007-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
492 J/kg
Mixed-layer CIN
-403 J/kg
Mixed-layer LCL
2294 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
35 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
Aug 9, 8:18 PM CDTSevere Thunderstorm WatchSPCAntelope, Cedar, Knox, Madison, Pierce, Stanton and 1 more4 hr
Aug 9, 9:33 PM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Burt, Butler, Cedar and 18 more87 min
Aug 9, 10:14 PM CDTSevere Thunderstorm WatchSPCAntelope, Boone, Burt, Butler, Cass, Cedar and 18 more6 hr
Aug 10, 1:45 AM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Burt, Butler, Cass and 23 more60 min
Aug 10, 4:25 AM CDTMesoscale DiscussionSPCAntelope, Boyd, Cedar, Colfax, Cuming, Dixon and 8 more35 min
Aug 10, 12:28 PM CDTSevere Thunderstorm WatchSPCAntelope, Cedar, Dakota, Dixon, Knox, Pierce and 2 more5 hr
Aug 10, 4:33 PM CDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Hooker, Thomas57 min
Aug 10, 5:03 PM CDTSevere Thunderstorm WatchSPCArthur, Blaine, Brown, Cherry, Custer, Garden and 9 more6 hr
Aug 10, 2:04 PM CDTMesoscale DiscussionSPCCampbell, Corson, Dewey, Edmunds, McPherson, Potter and 4 more116 min
Aug 10, 3:41 PM CDTSevere Thunderstorm WatchSPCBrown, Campbell, Corson, Dewey, Edmunds, Faulk and 4 more8 hr

Nearby

Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Nebraska, 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.