Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 109

February 19, 2011Cheyenne County, Decatur County, Rawlins County, Kansas; 20 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Feb 19, 2011, 11:05 PM CST for Cheyenne County, Decatur County, Rawlins County, Kansas; 20 counties in Nebraska. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Feb 19, 2011, 11:05 PM CST (05:05 UTC)
Expired: Feb 20, 2011, 12:30 AM CST
In force: 85 min
Issued by: the Storm Prediction Center

All 23 counties

Cheyenne County, KS, Decatur County, KS, Rawlins County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Dawson County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Merrick County, NE, Phelps County, NE, Red Willow County, NE, Sherman County, NE, Webster County, NE

The radar

The Grand Island radar (KUEX), 133 km from the middle of the area, began a volume at 05:06 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 00:00Z, 5.1 hours before the alert went out and 97 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1710 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 398 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
Feb 19, 11:25 PM CST	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Cherry, Garfield, Holt and 7 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Kansas, 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.