Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 111, NWS Grand Forks, ND

September 15, 2021Pembina County, Walsh County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 15, 2021, 9:42 PM CDT for Pembina County, Walsh County, North Dakota. It was in force for 63 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: Sep 15, 2021, 9:42 PM CDT (02:42 UTC)
Expired: Sep 15, 2021, 10:45 PM CDT
In force: 63 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Pembina County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 102 km from the middle of the area, began a volume at 02:45 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
Sep 15, 10:05 PM CDT	HAIL 1	6 Ene Park River, ND	A FEW HAIL UP TO QUARTER SIZED. TIME ESTIMATED BASED ON RADAR.

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

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.7 hours before the alert went out and 287 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: 96 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 2621 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

416 
WUUS53 KFGF 160242
SVRFGF
NDC067-099-160345-
/O.NEW.KFGF.SV.W.0111.210916T0242Z-210916T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
942 PM CDT Wed Sep 15 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Central Walsh County in northeastern North Dakota...
  South central Pembina County in northeastern North Dakota...

* Until 1045 PM CDT.

* At 941 PM CDT, a severe thunderstorm was located near Lankin, or 22
  miles west of Grafton, moving east at 30 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...
  Edinburg around 945 PM CDT.
  Park River and Pisek around 955 PM CDT.

Other locations in the path of this severe thunderstorm include
Mandt, Hoople, Nash and Auburn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4836 9802 4848 9801 4862 9728 4831 9722
      4830 9788
TIME...MOT...LOC 0241Z 258DEG 26KT 4840 9789 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Lynch

1 follow-up statement

996 
WWUS53 KFGF 160312
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
1012 PM CDT Wed Sep 15 2021

NDC067-099-160345-
/O.CON.KFGF.SV.W.0111.000000T0000Z-210916T0345Z/
Walsh ND-Pembina ND-
1012 PM CDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHEASTERN WALSH AND SOUTH CENTRAL PEMBINA COUNTIES...

At 1011 PM CDT, a severe thunderstorm was located over Mandt, or 9
miles west of Grafton, moving east at 30 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...
  Nash, Auburn, Grafton, Cashel and Oakwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4838 9787 4852 9778 4862 9728 4831 9722
      4830 9774
TIME...MOT...LOC 0311Z 258DEG 26KT 4844 9761 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Lynch

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 8:52 PM CDT	Special Weather Statement	FGF	Cavalier	38 min
Sep 15, 9:31 PM CDT	Special Weather Statement	FGF	Walsh	59 min
Sep 15, 9:33 PM CDT	Special Weather Statement	FGF	Nelson	57 min
Sep 15, 10:38 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	52 min
Sep 15, 10:47 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	43 min
Sep 15, 11:45 PM CDT	Severe Thunderstorm Warning	FGF	Traill	60 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.