Alert archive / Nebraska / Mesoscale Discussions in 2019

Mesoscale Discussion 1449

July 12, 201910 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2019, 9:02 PM MDT for 10 counties in Nebraska. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jul 12, 2019, 9:02 PM MDT (03:02 UTC)
Expired: Jul 12, 2019, 10:30 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 111 km from the middle of the area, began a volume at 03:00 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, 3.0 hours before the alert went out and 85 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: 2983 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2033 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jul 12, 6:15 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Blaine, Box Butte, Brown, Chase and 25 more	2 hr
Jul 12, 7:00 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Brown, Chase, Custer, Deuel and 16 more	6 hr
Jul 12, 10:48 PM MDT	Mesoscale Discussion	SPC	Blaine, Brown, Custer, Garfield, Holt, Logan and 5 more	57 min

Nearby

Mesoscale Discussions in Nebraska, 2019 Every mesoscale discussion in 2019

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.