Alert archive / North Dakota / Tornado Warnings in 2017
Tornado Warning 6, NWS Bismarck, ND
NWS Bismarck, ND issued this tornado warning at Aug 12, 2017, 6:53 PM CDT for Sioux County, North Dakota. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2017, 6:53 PM CDT (23:53 UTC)
- Expired
- Aug 12, 2017, 7:30 PM CDT
- In force
- 37 min
- Issued by
- NWS Bismarck, ND
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.5 in
County Sioux County, ND
The radar
The Bismarck radar (KBIS), 88 km from the middle of the area, began a volume at 23:55 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.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.9 hours before the alert went out and 90 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
- 108 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 932 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
490
WFUS53 KBIS 122353
TORBIS
NDC085-130030-
/O.NEW.KBIS.TO.W.0006.170812T2353Z-170813T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Bismarck ND
653 PM CDT SAT AUG 12 2017
The National Weather Service in Bismarck has issued a
* Tornado Warning for...
South central Sioux County in south central North Dakota...
* Until 730 PM CDT
* At 653 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles southwest of Shields, or 14 miles west of
Selfridge, moving southeast at 15 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This tornadic thunderstorm will remain over mainly rural areas of
south central Sioux County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area.
&&
LAT...LON 4609 10131 4614 10122 4608 10101 4595 10103
4594 10116 4594 10118
TIME...MOT...LOC 2353Z 317DEG 15KT 4609 10122
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
SIMOSKO3 follow-up statements
619
WWUS53 KBIS 130006
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
706 PM CDT SAT AUG 12 2017
NDC085-130030-
/O.CON.KBIS.TO.W.0006.000000T0000Z-170813T0030Z/
Sioux ND-
706 PM CDT SAT AUG 12 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR SOUTH
CENTRAL SIOUX COUNTY...
At 705 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles north of Walker, or 11 miles west of Selfridge,
moving southeast at 15 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
south central Sioux County.
LAT...LON 4605 10128 4612 10115 4608 10101 4595 10103
4594 10116 4594 10118
TIME...MOT...LOC 0005Z 317DEG 15KT 4605 10117
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
SIMOSKO683
WWUS53 KBIS 130022
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
722 PM CDT SAT AUG 12 2017
NDC085-130030-
/O.CON.KBIS.TO.W.0006.000000T0000Z-170813T0030Z/
Sioux ND-
722 PM CDT SAT AUG 12 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR SOUTH
CENTRAL SIOUX COUNTY...
At 722 PM CDT, a severe thunderstorm capable of producing a tornado
was located 5 miles north of Walker, or 8 miles west of Selfridge,
moving southeast at 15 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
south central Sioux County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!
&&
LAT...LON 4603 10126 4607 10107 4608 10101 4595 10103
4594 10116 4594 10118
TIME...MOT...LOC 0022Z 317DEG 15KT 4600 10110
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
SIMOSKO434
WWUS53 KBIS 130028
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
728 PM CDT SAT AUG 12 2017
NDC085-130038-
/O.EXP.KBIS.TO.W.0006.000000T0000Z-170813T0030Z/
Sioux ND-
728 PM CDT SAT AUG 12 2017
...THE TORNADO WARNING FOR SOUTH CENTRAL SIOUX COUNTY WILL EXPIRE AT
730 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and heavy rain are still possible with this thunderstorm.
LAT...LON 4603 10126 4607 10107 4608 10101 4595 10103
4594 10116 4594 10118
TIME...MOT...LOC 0028Z 317DEG 15KT 4598 10108
$$
SIMOSKOThe office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:44 PM CDT | Special Weather Statement | BIS | Golden Valley | 46 min |
| Aug 11, 8:06 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley, McKenzie | 54 min |
| Aug 11, 8:57 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley | 63 min |
| Aug 11, 9:54 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 66 min |
| Aug 11, 10:57 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, Slope, Stark | 63 min |
| Aug 12, 2:03 PM CDT | Special Weather Statement | BIS | McIntosh | 42 min |
| Aug 12, 2:13 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 62 min |
| Aug 12, 3:15 PM CDT | Special Weather Statement | BIS | Stark | 45 min |
| Aug 12, 3:22 PM CDT | Special Weather Statement | BIS | Dickey | 38 min |
| Aug 12, 3:33 PM CDT | Special Weather Statement | BIS | Bowman | 42 min |
| Aug 12, 3:39 PM CDT | Severe Thunderstorm Warning | BIS | Bowman | 31 min |
| Aug 12, 3:56 PM CDT | Special Weather Statement | BIS | Dickey | 49 min |
| Aug 12, 4:00 PM CDT | Special Weather Statement | BIS | Mercer | 45 min |
| Aug 12, 4:09 PM CDT | Special Weather Statement | BIS | Billings | 51 min |
| Aug 12, 4:27 PM CDT | Special Weather Statement | BIS | Mercer | 48 min |
| Aug 12, 4:34 PM CDT | Severe Thunderstorm Warning | BIS | Mercer | 56 min |
| Aug 12, 4:45 PM CDT | Special Weather Statement | BIS | Billings | 45 min |
| Aug 12, 4:51 PM CDT | Special Weather Statement | BIS | Mercer | 39 min |
| Aug 12, 5:14 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger, Slope, Stark | 61 min |
| Aug 12, 5:36 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 54 min |
| Aug 12, 6:17 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Hettinger | 58 min |
| Aug 12, 6:25 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 65 min |
Nearby
Tornado Warnings in North Dakota, 2017Every tornado warning in 2017Tornadoes in 2017
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.