Alert archive / Montana / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 140
The Storm Prediction Center issued this severe thunderstorm watch at May 31, 2018, 1:50 PM MDT for 31 counties in Montana. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 31, 2018, 1:50 PM MDT (19:50 UTC)
- Expired
- May 31, 2018, 10:00 PM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 31 counties
Beaverhead County, MT, Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Carter County, MT, Cascade County, MT, Custer 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, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Powder River County, MT, Powell County, MT, Rosebud County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 129 km from the middle of the area, began a volume at 19:49 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
- 20%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 2:33 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 13 min |
| May 31, 2:38 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 52 min |
| May 31, 2:47 PM MDT | Severe Thunderstorm Warning | MSO | Granite | 43 min |
| May 31, 3:11 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 34 min |
| May 31, 3:27 PM MDT | Severe Thunderstorm Warning | BYZ | Park, Sweet Grass | 48 min |
| May 31, 3:44 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 46 min |
| May 31, 4:16 PM MDT | Severe Thunderstorm Warning | BYZ | Carbon, Stillwater | 43 min |
| May 31, 4:27 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 48 min |
| May 31, 4:28 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 62 min |
| May 31, 4:39 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 36 min |
| May 31, 5:11 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Sweet Grass | 37 min |
| May 31, 5:20 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 55 min |
| May 31, 6:14 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 61 min |
| May 31, 6:20 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Gallatin, Madison | 40 min |
| May 31, 6:21 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 54 min |
| May 31, 6:59 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 14 min |
| May 31, 7:01 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud | 42 min |
| May 31, 7:03 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 42 min |
| May 31, 7:10 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 65 min |
| May 31, 7:27 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 46 min |
| May 31, 8:41 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 64 min |
| May 31, 8:51 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer | 54 min |
| May 31, 9:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 50 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 12:33 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Deer Lodge, Gallatin, Granite, Jefferson and 5 more | 117 min |
| May 31, 1:47 PM MDT | Mesoscale Discussion | SPC | Carter, Dawson, Fallon, Wibaux | 118 min |
| May 31, 5:27 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Custer, Gallatin, Golden Valley, Madison and 10 more | 93 min |
Nearby
Severe Thunderstorm Watches in Montana, 2018Every severe thunderstorm watch 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; radar from the NEXRAD Level II archive.