Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1643

September 5, 2016Decatur County, Rawlins County, Kansas; 24 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2016, 6:06 PM CDT for Decatur County, Rawlins County, Kansas; 24 counties in Nebraska. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Sep 5, 2016, 6:06 PM CDT (23:06 UTC)
Expired: Sep 5, 2016, 7:30 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 26 counties

Decatur County, KS, Rawlins County, KS, Antelope County, NE, Blaine County, NE, Boone County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Howard County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Phelps County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 107 km from the middle of the area, began a volume at 23:07 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.

Severe Thunderstorm Watch 468Sep 5, 7:35 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.1 hours before the alert went out and 45 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: 1581 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 798 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 4, 8:57 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Logan, Rawlins, Sheridan and 4 more	93 min
Sep 5, 3:30 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Graham, Grant, Greeley and 16 more	90 min
Sep 4, 7:50 PM CDT	Mesoscale Discussion	SPC	Blaine, Buffalo, Custer, Dawson, Logan, Loup and 2 more	115 min
Sep 4, 10:40 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boone, Boyd, Cedar, Custer and 10 more	4 hr
Sep 5, 1:10 AM CDT	Mesoscale Discussion	SPC	Dakota, Dixon, Thurston	2 hr
Sep 5, 3:08 PM CDT	Mesoscale Discussion	SPC	Blaine, Boyd, Garfield, Holt, Knox, Loup and 3 more	2 hr
Sep 5, 6:09 PM CDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Garden, Morrill, Scotts Bluff, Sioux	3 hr

Nearby

Mesoscale Discussions in Nebraska, 2016 Mesoscale Discussions in Kansas, 2016 Every mesoscale discussion in 2016

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.