Alert archive / Montana / Mesoscale Discussions in 2020
Mesoscale Discussion 911
The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2020, 2:21 PM MDT for 14 counties in Montana. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Jun 13, 2020, 2:21 PM MDT (20:21 UTC)
- Expired
- Jun 13, 2020, 4:15 PM MDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 40%
Counties Deer Lodge County, MT, Flathead County, MT, Glacier County, MT, Granite County, MT, Lake County, MT, Lewis and Clark County, MT, Mineral County, MT, Missoula County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Teton County, MT, Toole County, MT
The radar
The Missoula radar (KMSX), 60 km from the middle of the area, began a volume at 20:23 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 nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 8.4 hours before the alert went out and 197 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
- 1134 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- 165 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 |
|---|---|---|---|---|
| Jun 13, 5:19 PM MDT | Mesoscale Discussion | SPC | Custer, Dawson, Garfield, McCone, Phillips, Prairie and 2 more | 116 min |
Nearby
Mesoscale Discussions in Montana, 2020Every mesoscale discussion in 2020
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.