Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Grand Forks, ND

June 6, 2021Cavalier County, Towner County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 6, 2021, 2:17 AM CDT for Cavalier County, Towner County, North Dakota. It was in force for 43 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: Jun 6, 2021, 2:17 AM CDT (07:17 UTC)
Expired: Jun 6, 2021, 3:00 AM CDT
In force: 43 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cavalier County, ND, Towner County, ND

The radar

The Minot AFB radar (KMBX), 122 km from the middle of the area, began a volume at 07:20 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
Jun 6, 2:45 AM CDT	TSTM WND GST 68	7 E Perth, ND	VIA NDAWN.
Jun 6, 2:46 AM CDT	TSTM WND GST 66	4 Sw Clyde, ND	VIA NDAWN.

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
Jun 6, 1:39 AM CDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 7.3 hours before the alert went out and 248 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: 1639 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 3032 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

587 
WUUS53 KFGF 060717
SVRFGF
NDC019-095-060800-
/O.NEW.KFGF.SV.W.0006.210606T0717Z-210606T0800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
217 AM CDT Sun Jun 6 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Towner County in northeastern North Dakota...
  Western Cavalier County in northeastern North Dakota...

* Until 300 AM CDT.

* At 217 AM CDT, severe thunderstorms were located along a line
  extending from 7 miles northeast of St. John to 6 miles south of
  Agate, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Bisbee, Rocklake, Clyde, Sarles, Egeland, Calio and Calvin. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4900 9953 4900 9888 4860 9884 4854 9949
      4872 9949 4872 9952
TIME...MOT...LOC 0717Z 270DEG 29KT 4900 9958 4854 9947 

HAIL...<.75IN
WIND...60MPH
 
$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 7:24 PM CDT	Special Weather Statement	FGF	Pembina	66 min
Jun 5, 7:47 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina	58 min
Jun 5, 8:44 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	16 min
Jun 6, 1:49 AM CDT	Special Weather Statement	FGF	Benson, Eddy, Towner	56 min
Jun 6, 1:55 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Eddy, Ramsey, Towner	65 min
Jun 6, 2:39 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Eddy, Grand Forks, Griggs, Nelson and 4 more	51 min
Jun 6, 3:24 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	66 min
Jun 6, 4:33 AM CDT	Red Flag Warning	FGF	Barnes, Benson, Cass, Cavalier, Eddy, Grand Forks and 8 more	16 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.