Alert archive / North Dakota / Special Weather Statements in 2021

Special Weather Statement, NWS Grand Forks, ND

October 13, 2021Cass County, North Dakota

NWS Grand Forks, ND issued this special weather statement at Oct 13, 2021, 5:21 PM CDT for Cass County, North Dakota. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 13, 2021, 5:21 PM CDT (22:21 UTC)
Expired: Oct 13, 2021, 5:45 PM CDT
In force: 24 min
Issued by: NWS Grand Forks, ND
Hail: 0.25 in
Wind: 30
Spout: Possible

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 81 km from the middle of the area, began a volume at 22:24 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.4 hours before the alert went out and 247 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

645 
WWUS83 KFGF 132221
SPSFGF

Special Weather Statement
National Weather Service Grand Forks ND
521 PM CDT Wed Oct 13 2021
 
MNZ003-029-NDZ039-053-132245-
Clay MN-Wilkin MN-Richland ND-Cass ND-
521 PM CDT Wed Oct 13 2021

...Strong thunderstorms will impact portions of southern Clay,
northwestern Wilkin, eastern Cass and north central Richland Counties
through 545 PM CDT...

At 519 PM CDT, Doppler radar was tracking strong thunderstorms
capable of producing a landspout along a line extending from near
Chaffee to near Wolverton. Movement was northeast at 40 mph.

HAZARD...Landspouts, winds in excess of 30 mph, and pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds 
         could knock down tree limbs and blow around unsecured 
         objects.

Strong thunderstorms will be near...
  Comstock, Wolverton and Oxbow around 525 PM CDT.
  Baker, Mapleton and Sabin around 535 PM CDT.

Other locations in the path of these storms include Downer, Prosper,
Argusville, Brooktree Park and Harwood.

This includes the following highways...
 Interstate 29 between mile markers 43 and 79.
 Interstate 94 in North Dakota between mile markers 325 and 352.
 Interstate 94 in Minnesota between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Conditions are favorable for the development of weak, brief funnel
clouds. This type of funnel cloud is harmless, but on rare occasions
they can briefly touch down, producing wind gusts over 50 mph. If a
funnel cloud is spotted move indoors and report your sighting to the
National Weather Service.

&&

LAT...LON 4711 9705 4678 9624 4650 9669 4680 9744
TIME...MOT...LOC 2219Z 224DEG 36KT 4682 9728 4659 9671 

LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

$$

BH

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 13, 3:39 PM CDT	Special Weather Statement	FGF	Sargent	36 min
Oct 13, 3:55 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	26 min
Oct 13, 4:05 PM CDT	Tornado Warning Tornado observed	FGF	Ransom, Sargent	17 min
Oct 13, 4:16 PM CDT	Special Weather Statement	FGF	Ransom	29 min
Oct 13, 5:44 PM CDT	Special Weather Statement	FGF	Steele	46 min
Oct 13, 5:04 PM CDT	Special Weather Statement	FGF	Wilkin	26 min
Oct 13, 5:33 PM CDT	Special Weather Statement	FGF	Otter Tail	27 min
Oct 13, 5:46 PM CDT	Special Weather Statement	FGF	Clay	29 min
Oct 13, 5:51 PM CDT	Special Weather Statement	FGF	Becker, Otter Tail	24 min
Oct 13, 6:19 PM CDT	Special Weather Statement	FGF	Mahnomen, Norman	26 min
Oct 13, 6:22 PM CDT	Special Weather Statement	FGF	Becker	23 min

Nearby

Special Weather Statements in North Dakota, 2021 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.