Alert archive / Nebraska / Mesoscale Discussions in 2012

Mesoscale Discussion 1716

August 6, 2012Phillips County, Colorado; 9 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2012, 4:58 PM MDT for Phillips County, Colorado; 9 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Aug 6, 2012, 4:58 PM MDT (22:58 UTC)
Expired
Aug 6, 2012, 7:30 PM MDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Phillips County, CO, Blaine County, NE, Brown County, NE, Chase County, NE, Keith County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 105 km from the middle of the area, began a volume at 22:58 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

Denver, CO (KDEN), launched 12:00Z, 11.0 hours before the alert went out and 219 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, Denver, CO at 12:00Z on 2012-08-06Temperature 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, Denver, CO at 12:00Z on 2012-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.19395878Sfc1 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
3555 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
80 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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Nearby

Mesoscale Discussions in Nebraska, 2012Mesoscale Discussions in Colorado, 2012Every mesoscale discussion in 2012

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.