Alert archive / North Dakota / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 252, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at Aug 11, 2020, 5:33 PM MDT for Bowman County, North Dakota. It was in force for 42 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 11, 2020, 5:33 PM MDT (23:33 UTC)
- Expired
- Aug 11, 2020, 6:15 PM MDT
- In force
- 42 min
- Issued by
- NWS Bismarck, ND
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Bowman County, ND
The radar
The Rapid City radar (KUDX), 239 km from the middle of the area, began a volume at 23:34 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 6:14 PM MDT | HAIL 1 | 6 W Sunset Butte, ND | 30-40 MPH WINDS ACCOMPANIED THE HAIL. ALSO MEASURED 3.5 INCHES OF RAIN IN ONE HOUR. MOST OF THE HAIL WAS SMALLER, WITH THE LARGER STONES THE SIZE OF A QUARTER. THE LARGER HAIL LASTED AROUND 10 MINUTES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 11.6 hours before the alert went out and 243 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
- 619 J/kg
- Mixed-layer CIN
- -348 J/kg
- Mixed-layer LCL
- 2036 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
319
WUUS53 KBIS 112333
SVRBIS
NDC011-120015-
/O.NEW.KBIS.SV.W.0252.200811T2333Z-200812T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
533 PM MDT Tue Aug 11 2020
The National Weather Service in Bismarck has issued a
* Severe Thunderstorm Warning for...
Western Bowman County in southwestern North Dakota...
* Until 615 PM MDT.
* At 532 PM MDT, a severe thunderstorm was located 10 miles northwest
of Mud Buttes, or 23 miles west of Bowman, moving southeast at 15
mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Mud Buttes around 605 PM MDT.
Other locations impacted by this severe thunderstorm include Sunset
Butte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4628 10405 4628 10394 4617 10345 4594 10366
4595 10370 4613 10405
TIME...MOT...LOC 2332Z 292DEG 13KT 4615 10388
HAIL...1.25IN
WIND...60MPH
$$
SCHILD1 follow-up statement
258
WWUS53 KBIS 112354
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
554 PM MDT Tue Aug 11 2020
NDC011-120015-
/O.CON.KBIS.SV.W.0252.000000T0000Z-200812T0015Z/
Bowman ND-
554 PM MDT Tue Aug 11 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR WESTERN BOWMAN COUNTY...
At 553 PM MDT, a severe thunderstorm was located 7 miles northwest of
Mud Buttes, or 21 miles west of Bowman, moving southeast at 15 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Mud Buttes and Sunset Butte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4628 10405 4628 10394 4617 10345 4594 10366
4595 10370 4613 10405
TIME...MOT...LOC 2353Z 297DEG 12KT 4612 10384
HAIL...1.75IN
WIND...60MPH
$$
SCHILDThe office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 5:06 PM MDT | Special Weather Statement | BIS | Bowman | 39 min |
| Aug 11, 5:50 PM MDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 25 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2020Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.