Alert archive / Montana / Mesoscale Discussions in 2018
Mesoscale Discussion 1033
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2018, 1:50 PM MDT for 24 counties in Montana. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2018, 1:50 PM MDT (19:50 UTC)
- Expired
- Jul 10, 2018, 3:45 PM MDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
- Chance of a watch
- 80%
All 24 counties
Blaine County, MT, Chouteau County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Hill County, MT, Judith Basin County, MT, McCone County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Sweet Grass County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 126 km from the middle of the area, began a volume at 19:52 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
Great_falls, MT (KTFX), launched 12:00Z, 7.8 hours before the alert went out and 160 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
- 406 J/kg
- Mixed-layer CIN
- -459 J/kg
- Mixed-layer LCL
- 2018 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 41 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 9, 6:01 PM MDT | Severe Thunderstorm Watch | SPC | Richland, Roosevelt, Sheridan | 8 hr |
| Jul 9, 6:22 PM MDT | Mesoscale Discussion | SPC | Powder River | 113 min |
| Jul 9, 7:59 PM MDT | Mesoscale Discussion | SPC | Richland, Roosevelt, Sheridan | 91 min |
| Jul 9, 9:24 PM MDT | Mesoscale Discussion | SPC | Roosevelt, Sheridan | 96 min |
| Jul 10, 2:14 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Broadwater, Cascade, Chouteau, Daniels, Fergus and 21 more | 7 hr |
| Jul 10, 4:28 PM MDT | Mesoscale Discussion | SPC | Blaine, Garfield, Golden Valley, Musselshell, Petroleum, Phillips and 2 more | 2 hr |
Nearby
Mesoscale Discussions in Montana, 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.