Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 506

May 6, 20145 counties in Colorado; 7 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 6, 2014, 11:52 PM MDT for 5 counties in Colorado; 7 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 6, 2014, 11:52 PM MDT (05:52 UTC)
Expired: May 7, 2014, 2:15 AM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Weld County, CO, Arthur County, NE, Cheyenne County, NE, Deuel County, NE, Garden County, NE, Keith County, NE, Kimball County, NE, Perkins County, NE

The radar

The Cheyenne radar (KCYS), 168 km from the middle of the area, began a volume at 05:54 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, 5.9 hours before the alert went out and 128 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 134 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 3362 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 229 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.

Issued	Product	Office	Counties	Lasted
May 7, 11:59 AM MDT	Mesoscale Discussion	SPC	Adams, Logan, Morgan, Phillips, Sedgwick, Washington and 2 more	2 hr
May 7, 12:37 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 10 more	7 hr
May 7, 4:05 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Larimer, Logan, Morgan, Phillips and 4 more	85 min
May 6, 6:06 PM MDT	Mesoscale Discussion	SPC	Banner, Scotts Bluff	54 min
May 7, 5:54 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Custer, Dawson and 15 more	66 min

Nearby

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