Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 1349

July 8, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2013, 3:42 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 8, 2013, 3:42 PM MDT (21:42 UTC)
Expired
Jul 8, 2013, 5:45 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 23 counties

Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Lawrence County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 120 km from the middle of the area, began a volume at 21:42 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

Riverton, WY (KRIW), launched 12:00Z, 9.7 hours before the alert went out and 344 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, Riverton, WY at 12:00Z on 2013-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2013-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2028 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jul 7, 6:31 PM MDTMesoscale DiscussionSPCBeaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter and 31 more119 min
Jul 8, 9:21 AM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Hill, Liberty, Phillips and 1 more84 min
Jul 8, 12:05 PM MDTMesoscale DiscussionSPCBroadwater, Cascade, Chouteau, Deer Lodge, Fergus, Golden Valley and 10 more85 min
Jul 8, 12:54 PM MDTMesoscale DiscussionSPCDaniels, McCone, Phillips, Richland, Roosevelt, Sheridan and 1 more66 min
Jul 8, 1:04 PM MDTSevere Thunderstorm WatchSPCBig Horn, Broadwater, Carbon, Fergus, Gallatin, Golden Valley and 10 more6 hr
Jul 8, 1:23 PM MDTSevere Thunderstorm WatchSPCDaniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more8 hr
Jul 8, 1:56 PM MDTMesoscale DiscussionSPCFlathead, Glacier, Lake, Lewis and Clark, Lincoln, Mineral and 6 more94 min
Jul 8, 4:01 PM MDTSevere Thunderstorm WatchSPCCarter, Custer, Fallon, Powder River, Rosebud, Treasure8 hr
Jul 8, 4:58 PM MDTMesoscale DiscussionSPCBig Horn, Broadwater, Carbon, Carter, Custer, Daniels and 28 more2 hr
Jul 7, 8:14 PM MDTMesoscale DiscussionSPCAdams, Antelope, Arthur, Boone, Buffalo, Burt and 52 more2 hr
Jul 8, 1:51 PM MDTMesoscale DiscussionSPCAntelope, Arthur, Banner, Blaine, Box Butte, Boyd and 25 more54 min
Jul 8, 3:00 PM MDTSevere Thunderstorm WatchSPCArthur, Blaine, Boyd, Brown, Cherry, Garden and 12 more7 hr

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Wyoming, 2013Mesoscale Discussions in Montana, 2013Every mesoscale discussion in 2013

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.