Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 153, NWS Bismarck, ND

August 30, 2021Morton County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Aug 30, 2021, 3:15 PM CDT for Morton County, North Dakota. It was in force for 60 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 30, 2021, 3:15 PM CDT (20:15 UTC)
Expired: Aug 30, 2021, 4:15 PM CDT
In force: 60 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

County Morton County, ND

The radar

The Bismarck radar (KBIS), 32 km from the middle of the area, began a volume at 20:18 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 30, 4:05 PM CDT	HAIL 2.25	11 Se Judson, ND	REPORT FROM AUGUST 30 STORM. HAIL WAS BETWEEN HEN EGG AND TENNIS BALL IN SIZE. YARD WAS WHITE WITH HAIL, AS IT HAILED FOR ABOUT ONE-HALF HOUR. 2.75 INCHES OF RAIN ALSO FELL. SOYBEAN CROP WAS SEVERELY DAMAGED.

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
Aug 30, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.3 hours before the alert went out and 36 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: 8 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1949 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

849 
WUUS53 KBIS 302015
SVRBIS
NDC059-302115-
/O.NEW.KBIS.SV.W.0153.210830T2015Z-210830T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
315 PM CDT Mon Aug 30 2021

The National Weather Service in Bismarck has issued a

* Severe Thunderstorm Warning for...
  Central Morton County in south central North Dakota...

* Until 415 PM CDT.

* At 315 PM CDT, a severe thunderstorm was located over Fish Creek
  Dam, or 15 miles west of Mandan, 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...
  St. Anthony.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4679 10138 4688 10107 4660 10079 4645 10120
TIME...MOT...LOC 2015Z 322DEG 11KT 4675 10120 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJS

2 follow-up statements

353 
WWUS53 KBIS 302038
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
338 PM CDT Mon Aug 30 2021

NDC059-302115-
/O.CON.KBIS.SV.W.0153.000000T0000Z-210830T2115Z/
Morton ND-
338 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR CENTRAL MORTON COUNTY...

At 338 PM CDT, a severe thunderstorm was located 5 miles southeast of
Fish Creek Dam, or 14 miles southwest of Mandan, moving southeast at
15 mph.

HAZARD...Two inch 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...
Fish Creek Dam and St. Anthony. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4678 10134 4687 10106 4660 10079 4645 10120
TIME...MOT...LOC 2038Z 322DEG 11KT 4669 10114 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJS

297 
WWUS53 KBIS 302102
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
402 PM CDT Mon Aug 30 2021

NDC059-302115-
/O.CON.KBIS.SV.W.0153.000000T0000Z-210830T2115Z/
Morton ND-
402 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR EAST CENTRAL MORTON COUNTY...

At 401 PM CDT, a severe thunderstorm was located 8 miles southeast of
Fish Creek Dam, or 15 miles southwest of Mandan, moving southeast at
10 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...
St. Anthony.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4670 10127 4682 10101 4660 10079 4645 10120
TIME...MOT...LOC 2101Z 321DEG 8KT 4666 10110 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 10:51 AM CDT	Special Weather Statement	BIS	Oliver	24 min
Aug 30, 10:54 AM CDT	Severe Thunderstorm Warning	BIS	Oliver	36 min
Aug 30, 11:28 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Oliver	47 min
Aug 30, 11:33 AM CDT	Areal Flood Advisory	BIS	Oliver	3 hr
Aug 30, 11:46 AM CDT	Flash Flood Warning	BIS	Oliver	3 hr
Aug 30, 12:13 PM CDT	Severe Thunderstorm Warning	BIS	Morton, Oliver	47 min
Aug 30, 12:58 PM CDT	Severe Thunderstorm Warning	BIS	Morton, Oliver	47 min
Aug 30, 1:02 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Oliver	43 min
Aug 30, 1:42 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Morton, Oliver	63 min
Aug 30, 1:44 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Oliver	61 min
Aug 30, 2:17 PM CDT	Severe Thunderstorm Warning Destructive damage threat	BIS	Morton	58 min
Aug 30, 3:48 PM CDT	Severe Thunderstorm Warning	BIS	McLean	42 min
Aug 30, 4:16 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Morton	59 min
Aug 30, 4:32 PM CDT	Severe Thunderstorm Warning	BIS	Hettinger	58 min
Aug 30, 4:43 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	47 min
Aug 30, 4:46 PM CDT	Areal Flood Advisory	BIS	Morton	3 hr
Aug 30, 5:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Grant, Morton	60 min
Aug 30, 5:28 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Oliver	47 min
Aug 30, 5:29 PM CDT	Severe Thunderstorm Warning Destructive damage threat	BIS	Adams, Hettinger	61 min
Aug 30, 5:43 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	47 min
Aug 30, 5:54 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	38 min
Aug 30, 6:02 PM CDT	Severe Thunderstorm Warning Destructive damage threat	BIS	Grant, Morton, Sioux	58 min
Aug 30, 6:30 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Adams	60 min
Aug 30, 6:49 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Grant, Morton, Sioux	35 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.