Alert archive / North Dakota / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 255
The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2021, 1:58 AM CDT for 23 counties in North Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2021, 1:58 AM CDT (06:58 UTC)
- Expired
- Jun 11, 2021, 7:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 23 counties
Barnes County, ND, Benson County, ND, Cass County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Traill County, ND, Walsh County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 57 km from the middle of the area, began a volume at 06:58 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 2:33 AM CDT | Severe Thunderstorm Warning | BIS | Emmons, Kidder, Logan, Stutsman | 57 min |
| Jun 11, 3:23 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Eddy, Griggs, Nelson, Ramsey, Steele | 67 min |
| Jun 11, 3:43 AM CDT | Severe Thunderstorm Warning | BIS | Dickey, Foster, LaMoure, Logan, McIntosh, Stutsman | 47 min |
| Jun 11, 3:48 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Griggs, Steele | 57 min |
| Jun 11, 4:07 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Ransom, Richland, Sargent | 38 min |
| Jun 11, 4:19 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Grand Forks, Nelson, Steele, Traill, Walsh | 56 min |
| Jun 11, 4:28 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Eddy, Griggs, Nelson, Ramsey, Steele | 62 min |
| Jun 11, 4:36 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Nelson, Pembina, Ramsey, Towner, Walsh | 54 min |
| Jun 11, 4:42 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Ransom, Richland, Sargent | 63 min |
| Jun 11, 4:47 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Griggs, Steele | 28 min |
| Jun 11, 5:07 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Grand Forks, Nelson, Steele, Traill, Walsh | 68 min |
| Jun 11, 5:39 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Richland | 66 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, 7.0 hours before the alert went out and 230 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
- 1785 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 2484 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.8
The text
As transmitted.
089 WWUS20 KWNS 110655 SEL5 SPC WW 110655 MNZ000-NDZ000-111200- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 255 NWS Storm Prediction Center Norman OK 200 AM CDT Fri Jun 11 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of A small part of northwestern Minnesota Eastern North Dakota * Effective this Friday morning from 200 AM until 700 AM CDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible Isolated large hail events to 1 inch in diameter possible SUMMARY...A squall line in central North Dakota will continue to move generally eastward through the early morning hours, with the threat for occasional damaging gusts and marginally severe hail before the storms weaken after moving into western Minnesota toward sunrise. The severe thunderstorm watch area is approximately along and 65 statute miles east and west of a line from 60 miles north northeast of Devils Lake ND to 70 miles south southeast of Jamestown ND. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU5). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 253...WW 254... AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 25035. ...Thompson
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 8:30 PM CDT | Mesoscale Discussion | SPC | Billings, Burke, Divide, Golden Valley, McKenzie, Mountrail and 1 more | 2 hr |
| Jun 10, 9:54 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Billings, Bottineau, Bowman, Burke, Burleigh and 24 more | 5 hr |
| Jun 10, 11:07 PM CDT | Mesoscale Discussion | SPC | Adams, Bowman, Grant, Hettinger, Slope, Stark | 83 min |
| Jun 10, 11:21 PM CDT | Mesoscale Discussion | SPC | Bottineau, Burke, Divide, McHenry, McKenzie, Mountrail and 3 more | 114 min |
| Jun 11, 12:52 AM CDT | Mesoscale Discussion | SPC | Barnes, Benson, Cass, Cavalier, Dickey, Eddy and 17 more | 53 min |
| Jun 11, 4:37 AM CDT | Mesoscale Discussion | SPC | Barnes, Cass, Cavalier, Grand Forks, Griggs, Nelson and 8 more | 83 min |
Nearby
Severe Thunderstorm Watches in North Dakota, 2021Every severe thunderstorm watch in 2021
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.