Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 1580

August 1, 201329 counties in Nebraska; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2013, 8:16 AM CDT for 29 counties in Nebraska; 15 counties in South Dakota. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Aug 1, 2013, 8:16 AM CDT (13:16 UTC)
Expired
Aug 1, 2013, 9:15 AM CDT
In force
59 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 44 counties

Antelope County, NE, Boone County, NE, Boyd County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Hamilton County, NE, Holt County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD, Turner County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 158 km from the middle of the area, began a volume at 13:16 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 1.3 hours before the alert went out and 157 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 2013-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 580 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 12:00Z on 2013-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
580 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
1047 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
5 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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 1, 12:53 PM CDTMesoscale DiscussionSPCAdams, Arthur, Blaine, Boone, Box Butte, Brown and 52 more2 hr
Aug 1, 1:22 PM CDTTornado WatchSPCAntelope, Blaine, Boone, Boyd, Brown, Buffalo and 26 more9 hr
Aug 1, 2:08 PM CDTSevere Thunderstorm WatchSPCBurt, Cedar, Colfax, Cuming, Dakota, Dixon and 9 more8 hr
Aug 1, 3:25 PM CDTMesoscale DiscussionSPCAdams, Antelope, Arthur, Blaine, Boone, Box Butte and 57 more95 min
Aug 1, 3:59 PM CDTSevere Thunderstorm WatchSPCArthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 11 more9 hr
Aug 1, 5:06 PM CDTMesoscale DiscussionSPCChase, Dundy, Hitchcock54 min
Aug 1, 5:09 PM CDTSevere Thunderstorm WatchSPCDundy, Hitchcock5 hr
Aug 1, 6:02 PM CDTMesoscale DiscussionSPCButler, Cass, Clay, Fillmore, Gage, Jefferson and 11 more58 min
Aug 1, 6:07 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Butler, Cass, Clay, Dawson and 26 more7 hr
Aug 1, 6:49 PM CDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Custer, Garfield, Grant and 13 more86 min

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in South Dakota, 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.