Alert archive / Montana / Mesoscale Discussions in 2017
Mesoscale Discussion 994
The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2017, 11:23 AM MDT for 6 counties in Idaho; 9 counties in Montana; Park County, Teton County, Wyoming. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2017, 11:23 AM MDT (17:23 UTC)
- Expired
- Jun 12, 2017, 2:00 PM MDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Bonneville County, ID, Clark County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Teton County, ID, Beaverhead County, MT, Carbon County, MT, Gallatin County, MT, Jefferson County, MT, Madison County, MT, Park County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Park County, WY, Teton County, WY
The radar
The Pocatello radar (KSFX), 214 km from the middle of the area, began a volume at 17:23 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, 5.4 hours before the alert went out and 287 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
- 956 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| Jun 12, 2:17 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Gallatin, Park, Stillwater, Sweet Grass | 88 min |
| Jun 12, 2:45 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Carbon, Golden Valley, Musselshell, Park, Powder River and 6 more | 7 hr |
| Jun 12, 11:29 AM MDT | Mesoscale Discussion | SPC | Converse, Goshen, Laramie, Niobrara, Platte, Weston | 2 hr |
| Jun 12, 1:11 PM MDT | Tornado Watch | SPC | Albany, Converse, Goshen, Laramie, Niobrara, Platte | 8 hr |
| Jun 12, 5:05 PM MDT | Mesoscale Discussion | SPC | Converse, Goshen, Laramie, Niobrara, Platte, Weston | 85 min |
| Jun 12, 5:35 PM MDT | Tornado Watch | SPC | Campbell, Crook, Weston | 8 hr |
Nearby
Mesoscale Discussions in Montana, 2017Mesoscale Discussions in Idaho, 2017Mesoscale Discussions in Wyoming, 2017Every mesoscale discussion in 2017
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.