Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1759

September 23, 2014Custer County, Sherman County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 23, 2014, 5:43 PM CDT for Custer County, Sherman County, Nebraska. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Sep 23, 2014, 5:43 PM CDT (22:43 UTC)
Expired
Sep 23, 2014, 6:45 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Custer County, NE, Sherman County, NE

The radar

The North Platte radar (KLNX), 92 km from the middle of the area, began a volume at 22:47 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.7 hours before the alert went out and 76 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, N. Platte/Lee Bi, NE at 12:00Z on 2014-09-23Temperature 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, N. Platte/Lee Bi, NE at 12:00Z on 2014-09-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 174 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
705 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
174 m²/s²
0-3 km storm-relative helicity
225 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 23, 3:48 PM CDTMesoscale DiscussionSPCBlaine, Brown, Buffalo, Cherry, Custer, Dawson and 19 more87 min

Nearby

Mesoscale Discussions in Nebraska, 2014Every mesoscale discussion in 2014

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.