Alert archive / North Dakota / Special Weather Statements in 2020

Special Weather Statement, NWS Bismarck, ND

August 9, 2020Rolette County, North Dakota

NWS Bismarck, ND issued this special weather statement at Aug 9, 2020, 8:45 AM CDT for Rolette County, North Dakota. It was in force for 30 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 9, 2020, 8:45 AM CDT (13:45 UTC)
Expired: Aug 9, 2020, 9:15 AM CDT
In force: 30 min
Issued by: NWS Bismarck, ND

County Rolette County, ND

The radar

The Minot AFB radar (KMBX), 98 km from the middle of the area, began a volume at 13:46 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, 1.8 hours before the alert went out and 252 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2140 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Bismarck, ND wrote its last area forecast discussion before this special weather statement went out at Aug 9, 6:50 AM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Aug 9, 6:50 AM CDT, 1 hour 55 minutes before

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Hazardous weather outlook, Aug 9, 8:44 AM CDT, 1 minute before

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In the hours before

Special weather statement, Aug 9, 3:00 AM CDT, 5 hours 45 minutes before

Special Weather Statement
National Weather Service Bismarck ND
300 AM CDT Sun Aug 9 2020

NDZ010-090830-
Mountrail ND-
300 AM CDT Sun Aug 9 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MOUNTRAIL COUNTY
UNTIL 330 AM CDT...

At 300 AM CDT, a strong thunderstorm was located near Ross, or 11
miles west of Stanley, moving northeast at 30 mph.

Penny size hail and wind gusts to 40 mph will be possible with this
storm.

Locations impacted include...
Stanley and Ross.

LAT...LON 4816 10264 4830 10279 4852 10248 4829 10225
TIME...MOT...LOC 0800Z 235DEG 25KT 4828 10263

ABELING

Special weather statement, Aug 9, 3:19 AM CDT, 5 hours 26 minutes before

Special Weather Statement
National Weather Service Bismarck ND
319 AM CDT Sun Aug 9 2020

NDZ002-011-090900-
Ward ND-Burke ND-
319 AM CDT Sun Aug 9 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WARD AND BURKE
COUNTIES UNTIL 400 AM CDT...

At 319 AM CDT, a strong thunderstorm was located 10 miles south of
Lignite, or 18 miles west of Bowbells, moving northeast at 50 mph.

Penny size hail and wind gusts to 55 mph will be possible with this
storm.

Locations impacted include...
Bowbells, Lignite, Flaxton, Niobe, Coteau and Northgate.

LAT...LON 4900 10202 4874 10203 4856 10262 4879 10287
      4900 10252
TIME...MOT...LOC 0819Z 241DEG 45KT 4874 10264

ABELING

Special weather statement, Aug 9, 5:13 AM CDT, 3 hours 32 minutes before

Special Weather Statement
National Weather Service Bismarck ND
513 AM CDT Sun Aug 9 2020

NDZ012-013-091100-
McHenry ND-Pierce ND-
513 AM CDT Sun Aug 9 2020

...SIGNIFICANT WEATHER ADVISORY FOR PIERCE AND CENTRAL MCHENRY
COUNTIES UNTIL 600 AM CDT...

At 513 AM CDT, a strong thunderstorm was located 5 miles north of
Karlsruhe, or 31 miles southwest of Rugby, moving northeast at 45
mph.

Nickel size hail and wind gusts to 40 mph will be possible with this
storm.

Locations impacted include...
Rugby, Towner, Drake, Granville, Denbigh, Karlsruhe, Balta, Barton,
Berwick, Balfour, Bergen, Silva, George Lake and Orrin.

LAT...LON 4854 10041 4855 10017 4844 9988 4796 9986
      4791 10064 4824 10094 4859 10041
TIME...MOT...LOC 1013Z 245DEG 37KT 4817 10061

ABELING

Special weather statement, Aug 9, 6:18 AM CDT, 2 hours 27 minutes before

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Special weather statement, Aug 9, 8:45 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Bismarck ND
845 AM CDT Sun Aug 9 2020

NDZ005-091415-
Rolette ND-
845 AM CDT Sun Aug 9 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROLETTE COUNTY UNTIL
915 AM CDT...

At 845 AM CDT, a strong thunderstorm was located near International
Peace Garden, or 18 miles west of Rolla, moving northeast at 30 mph.

Penny size hail and wind gusts to 40 mph will be possible with this
storm.

Locations impacted include...
International Peace Garden.

LAT...LON 4899 9952 4887 10006 4891 10010 4898 10010
      4900 10005 4900 9952
TIME...MOT...LOC 1345Z 243DEG 27KT 4895 10000

EDWARDS

The office that day

Everything else NWS Bismarck, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 8, 8:57 PM CDT	Special Weather Statement	BIS	Bowman	48 min
Aug 8, 9:04 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	41 min
Aug 8, 9:41 PM CDT	Special Weather Statement	BIS	Slope	34 min
Aug 9, 12:33 AM CDT	Special Weather Statement	BIS	McKenzie	27 min
Aug 9, 12:35 AM CDT	Special Weather Statement	BIS	McKenzie	25 min
Aug 9, 1:12 AM CDT	Special Weather Statement	BIS	McKenzie	33 min
Aug 9, 1:57 AM CDT	Special Weather Statement	BIS	Mountrail	33 min
Aug 9, 2:18 AM CDT	Special Weather Statement	BIS	Mountrail	42 min
Aug 9, 2:33 AM CDT	Severe Thunderstorm Warning	BIS	Dunn, McLean, Mountrail	34 min
Aug 9, 3:00 AM CDT	Special Weather Statement	BIS	Mountrail	30 min
Aug 9, 3:19 AM CDT	Special Weather Statement	BIS	Burke	41 min
Aug 9, 5:13 AM CDT	Special Weather Statement	BIS	McHenry, Pierce	47 min
Aug 9, 5:47 AM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	43 min
Aug 9, 6:18 AM CDT	Special Weather Statement	BIS	Rolette	42 min
Aug 9, 2:08 PM CDT	Tornado Warning	BIS	LaMoure	37 min
Aug 9, 3:23 PM CDT	Special Weather Statement	BIS	LaMoure	37 min
Aug 9, 3:30 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure	30 min
Aug 9, 3:50 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	20 min

Nearby

Special Weather Statements in North Dakota, 2020 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.