Alert archive / Minnesota / Special Weather Statements in 2021

Special Weather Statement, NWS Duluth, MN

August 29, 2021Lake County, Minnesota

NWS Duluth, MN issued this special weather statement at Aug 29, 2021, 1:04 AM CDT for Lake County, Minnesota. It was in force for 26 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: Aug 29, 2021, 1:04 AM CDT (06:04 UTC)
Expired: Aug 29, 2021, 1:30 AM CDT
In force: 26 min
Issued by: NWS Duluth, MN
Hail: 0.00 in
Wind: 40

County Lake County, MN

The radar

The Duluth radar (KDLH), 85 km from the middle of the area, began a volume at 06:07 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

Minneapolis, MN (KMPX), launched 00:00Z, 6.1 hours before the alert went out and 330 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: 1990 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 977 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Duluth, MN wrote its last area forecast discussion before this special weather statement went out at Aug 29, 12:29 AM CDT, 35 minutes earlier.

Area forecast discussion, Aug 29, 12:29 AM CDT, 35 minutes before

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Hazardous weather outlook, Aug 28, 10:25 PM CDT, 2 hours 39 minutes before

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In the hours before

Special weather statement, Aug 28, 8:12 PM CDT, 4 hours 52 minutes before

Special Weather Statement
National Weather Service Duluth MN
812 PM CDT Sat Aug 28 2021

MNZ012-019-020-290145-
Northern Cook/Northern Lake MN-Central St. Louis MN-
Southern Lake/North Shore MN-
812 PM CDT Sat Aug 28 2021

...Strong thunderstorms will impact portions of southeastern St.
Louis and southern Lake Counties through 845 PM CDT...

At 811 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Boulder Lake, to 7 miles northwest of
Knife River, to 6 miles southeast of Larsmont, moving northeast at 55
mph.

HAZARD...Half inch hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
Two Harbors, Silver Bay, Beaver Bay, Castle Danger, Thomas Lake Near
Brimson, Larsmont, Highland Lake, Boulder Lake, Alger, Wales,
Gooseberry Falls State Park, Pequaywan Lake, Split Rock Lighthouse
State Park, and Tettegouche State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a sturdy building.

&&

LAT...LON 4709 9077 4730 9117 4727 9120 4710 9143
      4707 9153 4700 9160 4694 9171 4703 9188
      4708 9226 4739 9157 4733 9114 4732 9115
      4730 9115 4711 9079 4711 9070
TIME...MOT...LOC 0111Z 241DEG 50KT 4708 9214 4704 9186 4693 9164

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...<30 MPH

GSF

Special weather statement, Aug 28, 10:58 PM CDT, 2 hours 6 minutes before

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Special weather statement, Aug 28, 11:19 PM CDT, 1 hour 45 minutes before

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Special weather statement, Aug 28, 11:23 PM CDT, 1 hour 41 minutes before

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Special weather statement, Aug 28, 11:40 PM CDT, 1 hour 24 minutes before

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Special weather statement, Aug 29, 1:04 AM CDT, 0 minutes before

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The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 28, 8:12 PM CDT	Special Weather Statement	DLH	Lake	33 min
Aug 28, 9:51 PM CDT	Small Craft Advisory	DLH		22 hr
Aug 28, 11:23 PM CDT	Special Weather Statement	DLH	Carlton	22 min
Aug 28, 7:44 PM CDT	Special Weather Statement	DLH	Douglas	31 min
Aug 28, 10:58 PM CDT	Special Weather Statement	DLH	Douglas	32 min
Aug 28, 11:19 PM CDT	Special Weather Statement	DLH	Price	11 min
Aug 28, 11:40 PM CDT	Special Weather Statement	DLH	Ashland, Bayfield	35 min
Aug 29, 1:56 AM CDT	Special Weather Statement	DLH	Sawyer	34 min
Aug 29, 2:56 AM CDT	Special Weather Statement	DLH	Price	34 min

Nearby

Special Weather Statements in Minnesota, 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.