Alert archive / Montana / Mesoscale Discussions in 2014
Mesoscale Discussion 616
The Storm Prediction Center issued this mesoscale discussion at May 18, 2014, 4:57 PM MDT for 4 states. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- May 18, 2014, 4:57 PM MDT (22:57 UTC)
- Expired
- May 18, 2014, 6:00 PM MDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 43 counties
Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Wibaux County, MT, Yellowstone County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Hettinger County, ND, McKenzie County, ND, Slope County, ND, Stark County, ND, Williams County, ND, Butte County, SD, Custer County, SD, Harding County, SD, Lawrence County, SD, Crook County, WY, Weston County, WY
The radar
The Billings radar (KBLX), 223 km from the middle of the area, began a volume at 22:59 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, 11.0 hours before the alert went out and 316 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
- 1235 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 12:37 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Big Horn, Broadwater, Carbon, Carter, Custer and 28 more | 83 min |
| May 18, 2:13 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Carbon, Custer, Fergus, Garfield, Golden Valley and 13 more | 7 hr |
| May 18, 5:12 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Dawson, Fallon, Powder River, Richland, Roosevelt and 1 more | 7 hr |
Nearby
Mesoscale Discussions in Montana, 2014Mesoscale Discussions in North Dakota, 2014Mesoscale Discussions in South Dakota, 2014Every mesoscale discussion in 2014
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.