Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1401

June 26, 201128 counties in Nebraska; 19 counties in South Dakota; Goshen County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2011, 2:30 PM CDT for 28 counties in Nebraska; 19 counties in South Dakota; Goshen County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 26, 2011, 2:30 PM CDT (19:30 UTC)
Expired
Jun 26, 2011, 4:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 48 counties

Antelope County, NE, Banner County, NE, Blaine County, NE, Boone County, NE, Box Butte County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Dawes County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Kimball County, NE, Knox County, NE, Loup County, NE, Morrill County, NE, Pierce County, NE, Rock County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Aurora County, SD, Bennett County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Douglas County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD, Goshen County, WY

The radar

The North Platte radar (KLNX), 67 km from the middle of the area, began a volume at 19:29 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 12:00Z, 7.5 hours before the alert went out and 138 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 12:00Z on 2011-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1761 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 12:00Z on 2011-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 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
1761 J/kg
Mixed-layer CIN
-195 J/kg
Mixed-layer LCL
1468 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
208 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

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.

IssuedProductOfficeCountiesLasted
Jun 25, 8:14 PM CDTSevere Thunderstorm WatchSPCBrown, Cherry, Keya Paha, Rock, Sheridan6 hr
Jun 25, 11:27 PM CDTMesoscale DiscussionSPCBrown, Cherry, Keya Paha63 min
Jun 26, 6:08 AM CDTMesoscale DiscussionSPCCherry, Keya Paha97 min
Jun 26, 6:16 AM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Brown, Burt, Butler and 40 more59 min
Jun 26, 10:44 AM CDTMesoscale DiscussionSPCBrown, Cherry, Grant, Hooker, Keya Paha, Sheridan and 1 more2 hr
Jun 26, 1:03 PM CDTSevere Thunderstorm WatchSPCBlaine, Boyd, Brown, Cherry, Garfield, Grant and 8 more7 hr
Jun 26, 3:09 PM CDTMesoscale DiscussionSPCAdams, Boone, Butler, Cass, Clay, Colfax and 20 more2 hr
Jun 26, 4:56 PM CDTSevere Thunderstorm WatchSPCAntelope, Boone, Burt, Butler, Cass, Cedar and 26 more7 hr
Jun 26, 12:35 PM CDTMesoscale DiscussionSPCBrown, Campbell, Corson, Dewey, Edmunds, Faulk and 10 more85 min

Nearby

Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in Wyoming, 2011Every 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.