Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 508

May 7, 20144 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2014, 11:59 AM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2014, 11:59 AM MDT (17:59 UTC)
Expired
May 7, 2014, 2:00 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 23 counties

Adams County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Arthur County, NE, Banner County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Hayes County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, McPherson County, NE, Perkins County, NE, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 118 km from the middle of the area, began a volume at 18:00 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

Denver, CO (KDEN), launched 12:00Z, 6.0 hours before the alert went out and 137 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 2014-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 97 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 12:00Z on 2014-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
97 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
776 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
29 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
May 6, 11:52 PM MDTMesoscale DiscussionSPCLogan, Morgan, Phillips, Sedgwick, Weld2 hr
May 7, 12:37 PM MDTSevere Thunderstorm WatchSPCAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 10 more7 hr
May 7, 4:05 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Larimer, Logan, Morgan, Phillips and 4 more85 min
May 7, 3:41 PM MDTMesoscale DiscussionSPCBarber, Butler, Chase, Harper, Harvey, Kingman and 5 more64 min
May 7, 4:10 PM MDTSevere Thunderstorm WatchSPCBarton, Butler, Ellsworth, Harper, Harvey, Kingman and 8 more6 hr
May 7, 5:17 PM MDTSevere Thunderstorm WatchSPCClay, Dickinson, Geary, Marshall, Morris, Nemaha and 4 more5 hr
May 6, 6:06 PM MDTMesoscale DiscussionSPCBanner, Scotts Bluff54 min
May 7, 5:54 PM MDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Custer, Dawson and 15 more66 min

Nearby

Mesoscale Discussions in Nebraska, 2014Mesoscale Discussions in Colorado, 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.