Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 622

May 19, 201411 counties in Nebraska; Goshen County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 19, 2014, 6:44 PM MDT for 11 counties in Nebraska; Goshen County, Wyoming. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
May 19, 2014, 6:44 PM MDT (00:44 UTC)
Expired
May 19, 2014, 7:45 PM MDT
In force
61 min
Issued by
the Storm Prediction Center
Chance of a watch
40%

Counties Arthur County, NE, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 160 km from the middle of the area, began a volume at 00:47 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

Denver, CO (KDEN), launched 00:00Z, 0.7 hours before the alert went out and 201 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 00:00Z on 2014-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 268 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 00:00Z on 2014-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
268 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
3141 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
May 20, 2:08 PM MDTMesoscale DiscussionSPCBanner, Kimball67 min
May 20, 2:31 PM MDTSevere Thunderstorm WatchSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more6 hr
May 20, 4:50 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more85 min

Nearby

Mesoscale Discussions in Nebraska, 2014Mesoscale Discussions in Wyoming, 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.