Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 843

June 23, 201810 counties in Nebraska; Bon Homme County, Hutchinson County, Yankton County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2018, 5:09 PM CDT for 10 counties in Nebraska; Bon Homme County, Hutchinson County, Yankton County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 23, 2018, 5:09 PM CDT (22:09 UTC)
Expired
Jun 23, 2018, 7:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Madison County, NE, Pierce County, NE, Saunders County, NE, Stanton County, NE, Wayne County, NE, Bon Homme County, SD, Hutchinson County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 130 km from the middle of the area, began a volume at 22:08 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, 10.2 hours before the alert went out and 130 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 2018-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 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 2018-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
14 J/kg
Mixed-layer CIN
-407 J/kg
Mixed-layer LCL
962 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jun 23, 5:14 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Dawes, Garden, Morrill, Scotts Bluff and 2 more61 min

Nearby

Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in South Dakota, 2018Every mesoscale discussion in 2018

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.