Alert archive / North Dakota / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 397
The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2020, 2:27 PM MDT for 8 counties in Montana; 11 counties in North Dakota; Butte County, Harding County, Perkins County, South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2020, 2:27 PM MDT (20:27 UTC)
- Expired
- Jul 23, 2020, 8:55 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 22 counties
Daniels County, MT, Dawson County, MT, Fallon County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Divide 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, Harding County, SD, Perkins County, SD
The radar
The Bismarck radar (KBIS), 223 km from the middle of the area, began a volume at 20:28 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
- 80%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 2:52 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 53 min |
| Jul 23, 3:12 PM MDT | Tornado Warning | UNR | Butte | 33 min |
| Jul 23, 3:18 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 57 min |
| Jul 23, 3:31 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Wibaux | 59 min |
| Jul 23, 3:47 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 58 min |
| Jul 23, 3:49 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 26 min |
| Jul 23, 4:07 PM MDT | Severe Thunderstorm Warning | BIS | Golden Valley, Slope | 53 min |
| Jul 23, 4:09 PM MDT | Severe Thunderstorm Warning | UNR | Harding, Perkins | 66 min |
| Jul 23, 4:53 PM MDT | Severe Thunderstorm Warning | BIS | Golden Valley, Slope | 40 min |
| Jul 23, 5:12 PM MDT | Severe Thunderstorm Warning | UNR | Harding, Perkins | 36 min |
| Jul 23, 5:35 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland, Wibaux | 55 min |
| Jul 23, 5:46 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Valley | 44 min |
| Jul 23, 7:08 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 35 min |
| Jul 23, 7:39 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 34 min |
| Jul 23, 8:40 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt | 15 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 |
|---|---|---|---|---|
| Jul 23, 11:39 AM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Deer Lodge, Gallatin, Granite, Jefferson and 6 more | 2 hr |
| Jul 23, 1:59 PM MDT | Mesoscale Discussion | SPC | Carter, Dawson, Fallon, Prairie, Richland, Wibaux | 2 hr |
| Jul 23, 2:43 PM MDT | Severe Thunderstorm Watch | SPC | Beaverhead, Broadwater, Cascade, Chouteau, Gallatin, Golden Valley and 9 more | 4 hr |
| Jul 23, 4:54 PM MDT | Mesoscale Discussion | SPC | Richland, Roosevelt, Sheridan, Wibaux | 2 hr |
| Jul 23, 5:24 PM MDT | Mesoscale Discussion | SPC | Carbon, Chouteau, Fergus, Golden Valley, Judith Basin, Musselshell and 3 more | 2 hr |
Nearby
Severe Thunderstorm Watches in North Dakota, 2020Severe Thunderstorm Watches in Montana, 2020Severe Thunderstorm Watches in South Dakota, 2020Every severe thunderstorm watch in 2020
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.