Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1450

July 30, 201634 counties in Nebraska; Gregory County, Todd County, Tripp County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2016, 6:28 PM MDT for 34 counties in Nebraska; Gregory County, Todd County, Tripp County, South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jul 30, 2016, 6:28 PM MDT (00:28 UTC)
Expired
Jul 30, 2016, 8:00 PM MDT
In force
92 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 37 counties

Arthur County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Buffalo County, NE, Cherry County, NE, Custer County, NE, Dawes County, NE, Dawson County, NE, Frontier County, NE, Garden County, NE, Garfield County, NE, Gosper County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Rock County, NE, Sheridan County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Gregory County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 19 km from the middle of the area, began a volume at 00:30 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.5 hours before the alert went out and 110 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2016-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1833 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2016-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1833 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1461 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.4
Supercell composite
6.7

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.

IssuedProductOfficeCountiesLasted
Jul 30, 8:32 PM MDTSevere Thunderstorm WatchSPCArthur, Blaine, Box Butte, Boyd, Brown, Cherry and 18 more7 hr
Jul 30, 10:03 PM MDTMesoscale DiscussionSPCArthur, Blaine, Box Butte, Brown, Cherry, Custer and 13 more117 min
Jul 30, 11:53 PM MDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Cherry, Custer, Dawson and 15 more97 min
Jul 31, 12:00 PM MDTMesoscale DiscussionSPCBox Butte, Dawes, Scotts Bluff, Sheridan, Sioux90 min
Jul 31, 2:48 PM MDTSevere Thunderstorm WatchSPCArthur, Box Butte, Cherry, Dawes, Deuel, Garden and 6 more7 hr
Jul 31, 4:42 PM MDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 10 more2 hr
Jul 30, 6:34 PM MDTMesoscale DiscussionSPCDewey, Hughes, Hyde, Jones, Lyman, Potter and 3 more86 min
Jul 30, 6:48 PM MDTSevere Thunderstorm WatchSPCBuffalo, Hughes, Hyde, Jones, Lyman, Potter and 2 more4 hr
Jul 30, 8:50 PM MDTMesoscale DiscussionSPCHughes, Hyde, Jones, Lyman, Stanley55 min
Jul 31, 1:27 PM MDTMesoscale DiscussionSPCCorson, Harding, Perkins, Ziebach2 hr

Nearby

Mesoscale Discussions in Nebraska, 2016Mesoscale Discussions in South Dakota, 2016Every 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.