Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 86, NWS Bismarck, ND

July 8, 2021Slope County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Jul 8, 2021, 4:38 PM MDT for Slope County, North Dakota. It was in force for 52 min. 3 reports 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: Jul 8, 2021, 4:38 PM MDT (22:38 UTC)
Expired: Jul 8, 2021, 5:30 PM MDT
In force: 52 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Slope County, ND

The radar

The Bismarck radar (KBIS), 202 km from the middle of the area, began a volume at 22:37 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
Jul 8, 4:52 PM MDT	HAIL 1.25	10 Ene Three V Crossing, ND	RELAYED FROM EMERGENCY MANAGER. MOSTLY QUARTERS WITH A FEW HALF DOLLARS MIXED IN.
Jul 8, 5:11 PM MDT	HAIL 1.75	3 W Amidon, ND	ARB OBSERVER. HAIL LASTED ABOUT 4 MINUTES.
Jul 8, 5:17 PM MDT	HAIL 1.75	3 Sw Amidon, ND	ONGOING AT THE TIME OF THE REPORT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 8, 3:38 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.6 hours before the alert went out and 207 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: 10 J/kg
Mixed-layer CIN: -299 J/kg
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

864 
WUUS53 KBIS 082238
SVRBIS
NDC087-082330-
/O.NEW.KBIS.SV.W.0086.210708T2238Z-210708T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
438 PM MDT Thu Jul 8 2021

The National Weather Service in Bismarck has issued a

* Severe Thunderstorm Warning for...
  Slope County in southwestern North Dakota...

* Until 530 PM MDT.

* At 437 PM MDT, a severe thunderstorm was located 15 miles west of
  Amidon, moving east at 25 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...
  Amidon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4663 10380 4663 10293 4628 10293 4628 10297
      4640 10381
TIME...MOT...LOC 2237Z 270DEG 21KT 4654 10365 

HAIL...1.75IN
WIND...60MPH
 
$$

EDWARDS

2 follow-up statements

383 
WWUS53 KBIS 082253
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
453 PM MDT Thu Jul 8 2021

NDC087-082330-
/O.CON.KBIS.SV.W.0086.000000T0000Z-210708T2330Z/
Slope ND-
453 PM MDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR SLOPE COUNTY...

At 453 PM MDT, a severe thunderstorm was located 9 miles northwest of
Amidon, moving east at 25 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...
Amidon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4663 10293 4628 10293 4628 10297 4638 10368
      4663 10373
TIME...MOT...LOC 2253Z 270DEG 21KT 4654 10351 

HAIL...1.75IN
WIND...60MPH
 
$$

EDWARDS

872 
WWUS53 KBIS 082314
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
514 PM MDT Thu Jul 8 2021

NDC087-082330-
/O.CON.KBIS.SV.W.0086.000000T0000Z-210708T2330Z/
Slope ND-
514 PM MDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR EASTERN SLOPE COUNTY...

At 513 PM MDT, a severe thunderstorm was located near Amidon, moving
east at 30 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...
Amidon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4663 10293 4628 10293 4628 10297 4637 10364
      4663 10366
TIME...MOT...LOC 2313Z 272DEG 26KT 4643 10338 

HAIL...1.75IN
WIND...60MPH
 
$$

EDWARDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 5:43 AM MDT	Special Weather Statement	BIS	Divide	47 min
Jul 8, 6:26 AM MDT	Special Weather Statement	BIS	Divide	49 min
Jul 8, 7:16 AM MDT	Special Weather Statement	BIS	Burke	29 min
Jul 8, 3:34 PM MDT	Severe Thunderstorm Warning	BIS	Divide	41 min
Jul 8, 4:00 PM MDT	Severe Thunderstorm Warning	BIS	Divide, Williams	60 min
Jul 8, 4:36 PM MDT	Severe Thunderstorm Warning	BIS	Williams	54 min
Jul 8, 4:51 PM MDT	Severe Thunderstorm Warning	BIS	Adams, Bowman	54 min
Jul 8, 4:53 PM MDT	Severe Thunderstorm Warning	BIS	McKenzie, Williams	37 min
Jul 8, 5:28 PM MDT	Severe Thunderstorm Warning	BIS	McKenzie, Williams	47 min
Jul 8, 5:28 PM MDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Slope	62 min
Jul 8, 5:34 PM MDT	Special Weather Statement	BIS	Stark	11 min
Jul 8, 5:38 PM MDT	Severe Thunderstorm Warning	BIS	McKenzie	37 min
Jul 8, 5:51 PM MDT	Severe Thunderstorm Warning	BIS	Billings, Stark	54 min
Jul 8, 5:52 PM MDT	Severe Thunderstorm Warning	BIS	Billings, Dunn, McKenzie	68 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.