Alert archive / Montana / Mesoscale Discussions in 2018
Mesoscale Discussion 532
The Storm Prediction Center issued this mesoscale discussion at May 26, 2018, 2:21 PM MDT for 39 counties in Montana; Park County, Wyoming. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2018, 2:21 PM MDT (20:21 UTC)
- Expired
- May 26, 2018, 4:15 PM MDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 40 counties
Beaverhead County, MT, Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Cascade County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Deer Lodge County, MT, Fallon County, MT, Fergus County, MT, Gallatin County, MT, Garfield County, MT, Golden Valley County, MT, Granite County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Madison County, MT, McCone County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Phillips County, MT, Powell County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Wibaux County, MT, Yellowstone County, MT, Park County, WY
The radar
The Billings radar (KBLX), 106 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 172 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
- 4 J/kg
- Mixed-layer CIN
- -294 J/kg
- Mixed-layer LCL
- 1948 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 173 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 |
|---|---|---|---|---|
| May 26, 4:46 PM MDT | Mesoscale Discussion | SPC | Custer, Dawson, Fallon, Garfield, McCone, Prairie and 4 more | 119 min |
| May 26, 5:36 PM MDT | Severe Thunderstorm Watch | SPC | Dawson, Fallon, Garfield, McCone, Prairie, Richland and 3 more | 9 hr |
Nearby
Mesoscale Discussions in Montana, 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.