Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 2041

September 30, 200738 counties in Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 30, 2007, 11:01 AM CDT for 38 counties in Nebraska; 6 counties in South Dakota. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Sep 30, 2007, 11:01 AM CDT (16:01 UTC)
Expired
Sep 30, 2007, 12:00 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 44 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Bon Homme County, SD, Clay County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Grand Island radar (KUEX), 147 km from the middle of the area, began a volume at 16:01 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

Omaha, NE (KOAX), launched 12:00Z, 4.0 hours before the alert went out and 185 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 12:00Z on 2007-09-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2007-09-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 450 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1296 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
450 m²/s²
0-3 km storm-relative helicity
472 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
Sep 29, 9:31 PM CDTMesoscale DiscussionSPCArthur, Blaine, Brown, Chase, Cherry, Custer and 16 more89 min
Sep 29, 10:38 PM CDTSevere Thunderstorm WatchSPCBoyd, Buffalo, Dawson, Franklin, Furnas, Garfield and 10 more3 hr
Sep 30, 12:10 PM CDTMesoscale DiscussionSPCCass, Gage, Johnson, Nemaha, Otoe, Pawnee and 1 more65 min
Sep 30, 1:02 PM CDTTornado WatchSPCBurt, Butler, Cass, Cedar, Clay, Colfax and 32 more7 hr
Sep 30, 3:36 PM CDTMesoscale DiscussionSPCBurt, Cedar, Cuming, Dakota, Dixon, Thurston and 2 more54 min
Sep 29, 7:26 PM CDTMesoscale DiscussionSPCBennett, Brule, Buffalo, Edmunds, Faulk, Hand and 11 more64 min
Sep 29, 9:28 PM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 14 more6 hr
Sep 30, 1:37 AM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 14 more53 min

Nearby

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