Alert archive / Nebraska / Mesoscale Discussions in 2018
Mesoscale Discussion 1177
The Storm Prediction Center issued this mesoscale discussion at Jul 27, 2018, 4:55 PM MDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 27, 2018, 4:55 PM MDT (22:55 UTC)
- Expired
- Jul 27, 2018, 7:00 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 31 counties
Big Horn County, MT, Blaine County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Dawes County, NE, Dawson County, NE, Garfield County, NE, Grant County, NE, Hooker County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Jackson County, SD, Lawrence County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Sheridan County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 112 km from the middle of the area, began a volume at 22:55 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
Rapid City, SD (KRAP), launched 12:00Z, 10.9 hours before the alert went out and 107 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1058 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:07 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Chase, Cheyenne, Deuel, Dundy and 9 more | 113 min |
| Jul 27, 12:35 PM MDT | Mesoscale Discussion | SPC | Banner, Chase, Cheyenne, Deuel, Dundy, Hayes and 4 more | 85 min |
| Jul 27, 1:04 PM MDT | Tornado Watch | SPC | Banner, Chase, Cheyenne, Deuel, Dundy, Hayes and 6 more | 8 hr |
| Jul 27, 2:52 PM MDT | Mesoscale Discussion | SPC | Dundy | 83 min |
Nearby
Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in South Dakota, 2018Mesoscale Discussions in Wyoming, 2018Every mesoscale discussion in 2018
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.