Alert archive / Wyoming / Mesoscale Discussions in 2018
Mesoscale Discussion 1184
The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2018, 2:17 PM MDT for 8 counties in Nebraska; Custer County, Fall River County, South Dakota; 11 counties in Wyoming. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2018, 2:17 PM MDT (20:17 UTC)
- Expired
- Jul 28, 2018, 3:45 PM MDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 21 counties
Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Albany County, WY, Campbell County, WY, Converse County, WY, Goshen County, WY, Johnson County, WY, Laramie County, WY, Natrona County, WY, Niobrara County, WY, Platte County, WY, Washakie County, WY, Weston County, WY
The radar
The Cheyenne radar (KCYS), 148 km from the middle of the area, began a volume at 20:18 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
Rapid City, SD (KRAP), launched 12:00Z, 8.3 hours before the alert went out and 252 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
- 1215 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 63 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 28, 2:34 PM MDT | Tornado Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 7 hr |
| Jul 28, 5:01 PM MDT | Mesoscale Discussion | SPC | Arthur, Chase, Deuel, Dundy, Frontier, Garden and 8 more | 119 min |
| Jul 28, 5:40 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Chase, Deuel, Dundy, Frontier, Garden and 9 more | 7 hr |
Nearby
Mesoscale Discussions in Wyoming, 2018Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in South Dakota, 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.