Alert archive / Montana / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 199
The Storm Prediction Center issued this severe thunderstorm watch at May 31, 2014, 2:22 PM MDT for 22 counties in Montana. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 31, 2014, 2:22 PM MDT (20:22 UTC)
- Expired
- May 31, 2014, 9:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 22 counties
Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield 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, Treasure County, MT, Valley County, MT, Wibaux County, MT, Yellowstone County, MT
The radar
The Glasgow radar (KGGW), 96 km from the middle of the area, began a volume at 20:22 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 2:45 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 60 min |
| May 31, 3:41 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 64 min |
| May 31, 3:48 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 27 min |
| May 31, 3:56 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 64 min |
| May 31, 4:07 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 53 min |
| May 31, 4:20 PM MDT | Tornado Warning | BYZ | Custer, Rosebud | 25 min |
| May 31, 4:37 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 53 min |
| May 31, 4:44 PM MDT | Tornado Warning | BYZ | Rosebud | 31 min |
| May 31, 5:05 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, McCone, Roosevelt, Sheridan | 55 min |
| May 31, 5:12 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 63 min |
| May 31, 5:12 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 63 min |
| May 31, 5:16 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 59 min |
| May 31, 5:29 PM MDT | Tornado Warning | BYZ | Custer, Rosebud | 31 min |
| May 31, 5:29 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 61 min |
| May 31, 5:38 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 37 min |
| May 31, 6:09 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 66 min |
| May 31, 6:22 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 53 min |
| May 31, 7:29 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 61 min |
| May 31, 8:09 PM MDT | Flash Flood Warning | GGW | Garfield, McCone | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.4 hours before the alert went out and 98 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
- 2972 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 12:32 PM MDT | Mesoscale Discussion | SPC | Big Horn, Custer, Dawson, Garfield, McCone, Phillips and 4 more | 118 min |
| May 31, 4:43 PM MDT | Mesoscale Discussion | SPC | Big Horn, Custer, Daniels, Dawson, Garfield, McCone and 11 more | 47 min |
| May 31, 5:12 PM MDT | Mesoscale Discussion | SPC | Chouteau, Fergus, Gallatin, Hill, Judith Basin, Meagher and 3 more | 93 min |
Nearby
Severe Thunderstorm Watches in Montana, 2014Every severe thunderstorm watch 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.