Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 1, NWS Bismarck, ND

May 23, 20214 counties in North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at May 23, 2021, 7:31 PM MDT for 4 counties in North Dakota. It was in force for 44 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: May 23, 2021, 7:31 PM MDT (01:31 UTC)
Expired: May 23, 2021, 8:15 PM MDT
In force: 44 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Grant County, ND, Mercer County, ND, Morton County, ND, Stark County, ND

The radar

The Bismarck radar (KBIS), 92 km from the middle of the area, began a volume at 01:32 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
May 23, 7:45 PM MDT	TSTM WND GST 70	6 Se Hebron, ND

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
May 23, 1:50 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.5 hours before the alert went out and 97 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: 36 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

006 
WUUS53 KBIS 240131
SVRBIS
NDC037-057-059-089-240215-
/O.NEW.KBIS.SV.W.0001.210524T0131Z-210524T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
831 PM CDT Sun May 23 2021

The National Weather Service in Bismarck has issued a

* Severe Thunderstorm Warning for...
  Northwestern Morton County in south central North Dakota...
  Eastern Stark County in southwestern North Dakota...
  Southwestern Mercer County in south central North Dakota...
  Northwestern Grant County in south central North Dakota...

* Until 915 PM CDT/815 PM MDT/.

* At 831 PM CDT/731 PM MDT/, a severe thunderstorm was located 13
  miles southwest of Glen Ullin, moving north at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Hebron around 855 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT/900 PM MDT/ for
south central and southwestern North Dakota.

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

&&

LAT...LON 4658 10205 4663 10206 4665 10218 4701 10220
      4701 10215 4703 10214 4705 10196 4699 10176
      4698 10176 4698 10174 4694 10158 4653 10193
TIME...MOT...LOC 0131Z 192DEG 32KT 4671 10206 

HAIL...1.00IN
WIND...60MPH
 
$$

EDWARDS

3 follow-up statements

657 
WWUS53 KBIS 240147
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
847 PM CDT Sun May 23 2021

NDC037-240157-
/O.CAN.KBIS.SV.W.0001.000000T0000Z-210524T0215Z/
Grant ND-
847 PM CDT Sun May 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GRANT COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT/900 PM MDT/ for
south central North Dakota.

LAT...LON 4675 10214 4701 10220 4701 10215 4703 10214
      4705 10196 4699 10176 4698 10176 4697 10169
      4672 10189 4672 10209 4669 10210
TIME...MOT...LOC 0147Z 192DEG 32KT 4685 10202 

$$

NDC057-059-089-240215-
/O.CON.KBIS.SV.W.0001.000000T0000Z-210524T0215Z/
Morton ND-Stark ND-Mercer ND-
847 PM CDT Sun May 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM
CDT/815 PM MDT/ FOR NORTHWESTERN MORTON...NORTHEASTERN STARK AND
SOUTHWESTERN MERCER COUNTIES...

At 847 PM CDT/747 PM MDT/, a severe thunderstorm was located near
Hebron, or 9 miles west of Glen Ullin, moving north at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  Hebron.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT/900 PM MDT/ for
south central North Dakota.

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

&&

LAT...LON 4675 10214 4701 10220 4701 10215 4703 10214
      4705 10196 4699 10176 4698 10176 4697 10169
      4672 10189 4672 10209 4669 10210
TIME...MOT...LOC 0147Z 192DEG 32KT 4685 10202 

HAIL...1.00IN
WIND...60MPH
 
$$

EDWARDS

820 
WWUS53 KBIS 240156
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
856 PM CDT Sun May 23 2021

NDC089-240204-
/O.CAN.KBIS.SV.W.0001.000000T0000Z-210524T0215Z/
Stark ND-
856 PM CDT Sun May 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN STARK COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4683 10210 4698 10210 4698 10214 4703 10214
      4705 10196 4699 10176 4698 10175 4681 10186
TIME...MOT...LOC 0154Z 194DEG 35KT 4696 10195 

$$

NDC057-059-240215-
/O.CON.KBIS.SV.W.0001.000000T0000Z-210524T0215Z/
Morton ND-Mercer ND-
856 PM CDT Sun May 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR NORTHWESTERN MORTON AND SOUTHWESTERN MERCER COUNTIES...

At 854 PM CDT, a severe thunderstorm was located 6 miles northeast of
Hebron, or 11 miles northwest of Glen Ullin, moving north at 40 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters reported 70 mph wind gusts 6 miles 
         southeast of Hebron.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

This severe thunderstorm will remain over mainly rural areas of
northwestern Morton and southwestern Mercer Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4683 10210 4698 10210 4698 10214 4703 10214
      4705 10196 4699 10176 4698 10175 4681 10186
TIME...MOT...LOC 0154Z 194DEG 35KT 4696 10195 

HAIL...1.00IN
WIND...70MPH
 
$$

EDWARDS

136 
WWUS53 KBIS 240214
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
914 PM CDT Sun May 23 2021

NDC057-059-240221-
/O.EXP.KBIS.SV.W.0001.000000T0000Z-210524T0215Z/
Morton ND-Mercer ND-
914 PM CDT Sun May 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MORTON AND
SOUTHWESTERN MERCER COUNTIES WILL EXPIRE AT 915 PM CDT...
        
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning will be allowed to expire.  However 
gusty winds are still possible with this thunderstorm, and a 
Significant Weather Advisory has been issued for western Mercer 
County until 930 PM CDT.

LAT...LON 4683 10210 4698 10210 4698 10214 4703 10214
      4705 10196 4699 10176 4698 10175 4681 10186
TIME...MOT...LOC 0211Z 192DEG 32KT 4710 10191 

$$

EDWARDS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 6:30 PM MDT	Special Weather Statement	BIS	Hettinger	30 min
May 23, 7:23 PM MDT	Special Weather Statement	BIS	Hettinger	22 min
May 23, 8:06 PM MDT	Special Weather Statement	BIS	Mercer	24 min
May 23, 11:12 PM MDT	Special Weather Statement	BIS	Logan, McIntosh	33 min
May 23, 11:44 PM MDT	Special Weather Statement	BIS	Dickey, LaMoure	31 min
May 24, 12:15 AM MDT	Special Weather Statement	BIS	Sheridan, Wells	30 min
May 24, 2:27 AM MDT	Wind Advisory	BIS	Burke, Divide, Dunn, McKenzie, Mountrail, Williams	17 hr

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.