Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 152, NWS Bismarck, ND

August 30, 2021Morton County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Aug 30, 2021, 2:17 PM CDT for Morton County, North Dakota. It was in force for 58 min. 2 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
Aug 30, 2021, 2:17 PM CDT (19:17 UTC)
Expired
Aug 30, 2021, 3:15 PM CDT
In force
58 min
Issued by
NWS Bismarck, ND
Area
Storm-based polygon
Tornado
Possible
Damage threat
Destructive
Hail
2.75 in
Wind
60.0 mph

County Morton County, ND

The radar

The Bismarck radar (KBIS), 39 km from the middle of the area, began a volume at 19:21 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

TimeReportWhereRemark
Aug 30, 2:24 PM CDTHAIL 1Sweet Briar Lake, NDALSO ESTIMATED 50 MPH WINDS.
Aug 30, 2:25 PM CDTHAIL 2.754 E New Salem, NDREPORT FROM AUGUST 30TH STORM. VARIOUS RESIDENTS OF THE AREA WERE GREATLY DAMAGED FROM BASEBALL SIZE HAIL. A COUPLE OF CAMPERS WERE DAMAGED, WINDOWS ON HOMES WERE BROKEN, AND SIDING WAS DESTROYED.

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.

IssuedProductOfficeLasted
Aug 30, 1:38 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.3 hours before the alert went out and 44 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2021-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2021-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

279 
WUUS53 KBIS 301917
SVRBIS
NDC059-302015-
/O.NEW.KBIS.SV.W.0152.210830T1917Z-210830T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
217 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 315 PM CDT.

* At 215 PM CDT, a severe thunderstorm was located near New Salem, or
  19 miles west of Mandan, moving southeast at 10 mph.

  THIS IS A DESTRUCTIVE STORM FOR CENTRAL MORTON COUNTY INCLUDING 
  SWEET BRIAR LAKE AND JUDSON.

  HAZARD...Baseball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be severely injured. 
           Expect shattered windows, extensive damage to roofs, 
           siding, and vehicles.

* Locations impacted include...
  Sweet Briar Lake, Judson, and Fish Creek Dam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

&&

LAT...LON 4689 10142 4698 10124 4678 10094 4663 10131
TIME...MOT...LOC 1915Z 327DEG 9KT 4685 10131 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJS
2 follow-up statements
346 
WWUS53 KBIS 301940
SVSBIS

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

NDC059-302015-
/O.CON.KBIS.SV.W.0152.000000T0000Z-210830T2015Z/
Morton ND-
240 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR CENTRAL MORTON COUNTY...

At 239 PM CDT, a severe thunderstorm was located near Fish Creek Dam,
or 17 miles west of Mandan, moving southeast at 10 mph.

THIS IS A DESTRUCTIVE STORM FOR CENTRAL MORTON COUNTY.

HAZARD...Baseball size hail and 60 mph wind gusts.

SOURCE...Radar indicated. At 210 PM CDT, golf ball size hail was 
         reported 4 miles northeast of New Salem.

IMPACT...People and animals outdoors will be severely injured. 
         Expect shattered windows, extensive damage to roofs, 
         siding, and vehicles.

Locations impacted include...
Fish Creek Dam, Judson, and Sweet Briar Lake. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.

&&

LAT...LON 4689 10142 4698 10124 4678 10094 4663 10131
TIME...MOT...LOC 1939Z 328DEG 9KT 4680 10127 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJS
465 
WWUS53 KBIS 301959
SVSBIS

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

NDC059-302015-
/O.CON.KBIS.SV.W.0152.000000T0000Z-210830T2015Z/
Morton ND-
259 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR CENTRAL MORTON COUNTY...

At 258 PM CDT, a severe thunderstorm was located just north of Fish 
Creek Dam, or 16 miles west 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...
Fish Creek Dam, Judson, and Sweet Briar Lake. 

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 4689 10142 4695 10119 4678 10094 4663 10131
TIME...MOT...LOC 1958Z 324DEG 8KT 4677 10124 

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.

IssuedProductOfficeCountiesLasted
Aug 30, 10:51 AM CDTSpecial Weather StatementBISOliver24 min
Aug 30, 10:54 AM CDTSevere Thunderstorm WarningBISOliver36 min
Aug 30, 11:28 AM CDTSevere Thunderstorm Warning Considerable damage threatBISOliver47 min
Aug 30, 11:33 AM CDTAreal Flood AdvisoryBISOliver3 hr
Aug 30, 11:46 AM CDTFlash Flood WarningBISOliver3 hr
Aug 30, 12:13 PM CDTSevere Thunderstorm WarningBISMorton, Oliver47 min
Aug 30, 12:58 PM CDTSevere Thunderstorm WarningBISMorton, Oliver47 min
Aug 30, 1:02 PM CDTSevere Thunderstorm WarningBISMercer, Oliver43 min
Aug 30, 1:42 PM CDTSevere Thunderstorm Warning Considerable damage threatBISMorton, Oliver63 min
Aug 30, 1:44 PM CDTSevere Thunderstorm WarningBISMercer, Oliver61 min
Aug 30, 3:15 PM CDTSevere Thunderstorm Warning Considerable damage threatBISMorton60 min
Aug 30, 3:48 PM CDTSevere Thunderstorm WarningBISMcLean42 min
Aug 30, 4:16 PM CDTSevere Thunderstorm Warning Considerable damage threatBISMorton59 min
Aug 30, 4:32 PM CDTSevere Thunderstorm WarningBISHettinger58 min
Aug 30, 4:43 PM CDTSevere Thunderstorm WarningBISGrant, Morton47 min
Aug 30, 4:46 PM CDTAreal Flood AdvisoryBISMorton3 hr
Aug 30, 5:00 PM CDTSevere Thunderstorm Warning Considerable damage threatBISGrant, Morton60 min
Aug 30, 5:28 PM CDTSevere Thunderstorm WarningBISMercer, Oliver47 min
Aug 30, 5:29 PM CDTSevere Thunderstorm Warning Destructive damage threatBISAdams, Hettinger61 min
Aug 30, 5:43 PM CDTSevere Thunderstorm WarningBISMcLean, Mercer47 min
Aug 30, 5:54 PM CDTSevere Thunderstorm WarningBISGrant, Morton38 min
Aug 30, 6:02 PM CDTSevere Thunderstorm Warning Destructive damage threatBISGrant, Morton, Sioux58 min
Aug 30, 6:30 PM CDTSevere Thunderstorm Warning Considerable damage threatBISAdams60 min
Aug 30, 6:49 PM CDTSevere Thunderstorm WarningBISEmmons, Grant, Morton, Sioux35 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2021Every 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.