Alert archive / North Dakota / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 264
The Storm Prediction Center issued this severe thunderstorm watch at Jul 7, 2018, 8:41 PM MDT for 20 counties in North Dakota; 6 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2018, 8:41 PM MDT (02:41 UTC)
- Expired
- Jul 8, 2018, 3:39 AM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 26 counties
Adams County, ND, Bowman County, ND, Burleigh County, ND, Dunn County, ND, Emmons County, ND, Foster County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, Logan County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Stutsman County, ND, Wells County, ND, Butte County, SD, Corson County, SD, Harding County, SD, Meade County, SD, Perkins County, SD, Ziebach County, SD
The radar
The Bismarck radar (KBIS), 134 km from the middle of the area, began a volume at 02:41 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 9:58 PM MDT | Severe Thunderstorm Warning | UNR | Harding, Perkins | 77 min |
| Jul 7, 10:28 PM MDT | Severe Thunderstorm Warning | BIS | Adams, Hettinger | 62 min |
| Jul 7, 10:37 PM MDT | Severe Thunderstorm Warning | UNR | Perkins | 53 min |
| Jul 7, 10:54 PM MDT | Severe Thunderstorm Warning | ABR | Corson | 52 min |
| Jul 7, 11:08 PM MDT | Severe Thunderstorm Warning | BIS | Adams, Grant, Hettinger, Sioux | 67 min |
| Jul 8, 12:17 AM MDT | Severe Thunderstorm Warning | BIS | McLean, Mercer, Oliver | 38 min |
| Jul 8, 12:31 AM MDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Kidder, Morton | 59 min |
| Jul 8, 1:28 AM MDT | Severe Thunderstorm Warning | BIS | Burleigh, Kidder, Stutsman, Wells | 62 min |
| Jul 8, 2:11 AM MDT | Severe Thunderstorm Warning | BIS | Foster, Pierce, Wells | 54 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 2.7 hours before the alert went out and 138 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
- 2704 J/kg
- Mixed-layer CIN
- -145 J/kg
- Mixed-layer LCL
- 1745 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:55 PM MDT | Mesoscale Discussion | SPC | Adams, Bowman, Burleigh, Emmons, Foster, Grant and 8 more | 65 min |
| Jul 7, 10:44 PM MDT | Mesoscale Discussion | SPC | Adams, Barnes, Burleigh, Eddy, Emmons, Foster and 12 more | 2 hr |
| Jul 8, 1:35 AM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Eddy, Foster, Grand Forks, Griggs and 10 more | 85 min |
| Jul 8, 2:14 AM MDT | Severe Thunderstorm Watch | SPC | Benson, Cavalier, Eddy, Grand Forks, Griggs, Nelson and 5 more | 5 hr |
| Jul 8, 12:16 PM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, Griggs, LaMoure, Logan and 7 more | 2 hr |
| Jul 8, 2:52 PM MDT | Severe Thunderstorm Watch | SPC | Barnes, Cass, Dickey, LaMoure, Ransom, Richland and 1 more | 7 hr |
| Jul 8, 4:46 PM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, LaMoure, Ransom, Richland and 1 more | 119 min |
Nearby
Severe Thunderstorm Watches in North Dakota, 2018Severe Thunderstorm Watches in South Dakota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.