Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1033

May 30, 20114 counties in Colorado; 15 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 30, 2011, 4:47 PM MDT for 4 counties in Colorado; 15 counties in Nebraska. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 30, 2011, 4:47 PM MDT (22:47 UTC)
Expired: May 30, 2011, 5:45 PM MDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Logan County, CO, Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Arthur County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, McPherson County, NE, Perkins County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 132 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, 10.8 hours before the alert went out and 83 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: 1099 J/kg
Mixed-layer CIN: -360 J/kg
Mixed-layer LCL: 2078 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 302 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.

Issued	Product	Office	Counties	Lasted
May 30, 1:19 PM MDT	Mesoscale Discussion	SPC	Logan, Phillips, Sedgwick, Weld	56 min
May 30, 3:45 PM MDT	Severe Thunderstorm Watch	SPC	Logan, Phillips, Sedgwick, Yuma	3 hr
May 29, 6:16 PM MDT	Tornado Watch	SPC	Cass, Douglas, Fillmore, Gage, Jefferson, Johnson and 11 more	4 hr
May 29, 8:24 PM MDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cass, Cedar and 31 more	96 min
May 30, 12:40 PM MDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Boyd, Buffalo, Cedar and 16 more	95 min
May 30, 1:08 PM MDT	Tornado Watch	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 29 more	7 hr
May 30, 5:17 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 25 more	118 min

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Colorado, 2011 Every mesoscale discussion in 2011

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.