Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 1705

August 9, 20075 counties in Iowa; 24 counties in Nebraska; 11 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2007, 9:33 PM CDT for 5 counties in Iowa; 24 counties in Nebraska; 11 counties in South Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Aug 9, 2007, 9:33 PM CDT (02:33 UTC)
Expired
Aug 9, 2007, 11:00 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 40 counties

Crawford County, IA, Harrison County, IA, Monona County, IA, Plymouth County, IA, Woodbury County, IA, Antelope County, NE, Boone County, NE, Boyd County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Holt County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 139 km from the middle of the area, began a volume at 02:34 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

Omaha, NE (KOAX), launched 00:00Z, 2.6 hours before the alert went out and 142 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, Omaha, NE at 00:00Z on 2007-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3891 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, Omaha, NE at 00:00Z on 2007-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
3891 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1233 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
1.4
Supercell composite
13.9

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, 10:14 PM CDTSevere Thunderstorm WatchSPCCherokee, Fremont, Harrison, Ida, Mills, Monona and 6 more6 hr
Aug 10, 1:45 AM CDTMesoscale DiscussionSPCCass, Crawford, Fremont, Harrison, Mills, Monona and 5 more60 min
Aug 10, 12:28 PM CDTSevere Thunderstorm WatchSPCPlymouth, Sioux, Woodbury5 hr
Aug 9, 8:18 PM CDTSevere Thunderstorm WatchSPCAntelope, Cedar, Knox, Madison, Pierce, Stanton and 1 more4 hr
Aug 10, 4:25 AM CDTMesoscale DiscussionSPCAntelope, Boyd, Cedar, Colfax, Cuming, Dixon and 8 more35 min
Aug 10, 10:45 AM CDTMesoscale DiscussionSPCBoyd, Brown, Cherry, Grant, Keya Paha, Rock90 min
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 Nebraska, 2007Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Iowa, 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.