Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1645

September 5, 201612 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2016, 11:31 PM CDT for 12 counties in Nebraska. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued: Sep 5, 2016, 11:31 PM CDT (04:31 UTC)
Expired: Sep 6, 2016, 12:00 AM CDT
In force: 29 min
Issued by: the Storm Prediction Center

Counties Antelope County, NE, Blaine County, NE, Custer County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Logan County, NE, Loup 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 04:34 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, 4.5 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: 125 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 2495 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 5, 7:37 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boone, Boyd, Buffalo, Cedar and 27 more	7 hr
Sep 6, 3:00 PM CDT	Mesoscale Discussion	SPC	Franklin, Webster	3 hr
Sep 6, 3:47 PM CDT	Mesoscale Discussion	SPC	Burt, Butler, Colfax, Cuming, Dodge, Douglas and 5 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 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.