Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1765

October 6, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Oct 6, 2016, 11:15 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 6, 2016, 11:15 AM CDT (16:15 UTC)
Expired
Oct 6, 2016, 1:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 42 counties

Cass County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Clay County, KS, Cloud County, KS, Jewell County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Washington County, KS, Atchison County, MO, Butler County, NE, Cass County, NE, Clay County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 134 km from the middle of the area, began a volume at 16:19 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, 4.3 hours before the alert went out and 134 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 2016-10-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 96 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 2016-10-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
96 J/kg
Mixed-layer CIN
-165 J/kg
Mixed-layer LCL
1114 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 6, 1:22 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Clarke, Dallas, Decatur and 9 more113 min
Oct 6, 2:12 PM CDTTornado WatchSPCAdair, Adams, Cass, Clarke, Decatur, Fremont and 10 more7 hr
Oct 5, 8:06 PM CDTMesoscale DiscussionSPCAnderson, Coffey, Douglas, Franklin, Greenwood, Jefferson and 6 more2 hr
Oct 5, 11:03 PM CDTMesoscale DiscussionSPCAllen, Bourbon, Chautauqua, Cowley, Elk, Greenwood and 4 more117 min
Oct 6, 5:12 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Cowley, Dickinson, Elk and 13 more93 min
Oct 6, 6:22 PM CDTMesoscale DiscussionSPCBourbon83 min

Nearby

Mesoscale Discussions in Nebraska, 2016Mesoscale Discussions in Kansas, 2016Mesoscale Discussions in Iowa, 2016Every mesoscale discussion in 2016

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.