Dense Fog Advisory 21, NWS Duluth, MN

792 
WWUS73 KDLH 070234
NPWDLH

URGENT - WEATHER MESSAGE
National Weather Service Duluth MN
934 PM CDT Wed Oct 6 2021

MNZ020-021-037-071445-
/O.CON.KDLH.FG.Y.0021.000000T0000Z-211007T1500Z/
Southern Lake-Southern Cook-Carlton and South St. Louis-
Including the cities of Two Harbors, Silver Bay, Grand Marais, 
and Duluth
934 PM CDT Wed Oct 6 2021

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 10 AM CDT
THURSDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Southern Lake, Southern Cook and Carlton and South St. 
  Louis Counties. This includes the Tribal Lands of the Fond du 
  Lac Band and the Grand Portage Reservation.

* WHEN...Until 10 AM CDT Thursday.

* IMPACTS...Hazardous driving conditions due to low visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

Huyck

774 
WWUS73 KDLH 071014
NPWDLH

URGENT - WEATHER MESSAGE
National Weather Service Duluth MN
514 AM CDT Thu Oct 7 2021

WIZ001>003-071500-
/O.EXA.KDLH.FG.Y.0021.000000T0000Z-211007T1500Z/
Douglas-Bayfield-Ashland-
Including the cities of Superior, Washburn, Bayfield, and Ashland
514 AM CDT Thu Oct 7 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING...

* WHAT...Visibility less than one mile in dense fog.

* WHERE...Douglas, Bayfield and Ashland Counties. This includes 
  the Tribal Lands of the Red Cliff Band and the Bad River 
  Reservation.

* WHEN...Until 10 AM CDT this morning.

* IMPACTS...Hazardous driving conditions due to low visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

MNZ020-021-037-071500-
/O.CON.KDLH.FG.Y.0021.000000T0000Z-211007T1500Z/
Southern Lake-Southern Cook-Carlton and South St. Louis-
Including the cities of Two Harbors, Silver Bay, Grand Marais, 
and Duluth
514 AM CDT Thu Oct 7 2021

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 10 AM CDT THIS
MORNING...

* WHAT...Visibility one quarter to one half mile in dense fog.

* WHERE...Carlton and South St. Louis, Southern Cook and 
  Southern Lake Counties. This includes the Tribal Lands of the 
  Grand Portage Reservation and the Fond du Lac Band.

* WHEN...Until 10 AM CDT this morning.

* IMPACTS...Hazardous driving conditions due to low visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

918 
WWUS73 KDLH 071459
NPWDLH

URGENT - WEATHER MESSAGE
National Weather Service Duluth MN
959 AM CDT Thu Oct 7 2021

MNZ021-WIZ002-003-071600-
/O.CAN.KDLH.FG.Y.0021.000000T0000Z-211007T1500Z/
Southern Cook-Bayfield-Ashland-
Including the cities of Grand Marais, Washburn, Bayfield, 
and Ashland
959 AM CDT Thu Oct 7 2021

...DENSE FOG ADVISORY IS CANCELLED...

Fog has cleared and visibilities have improved for much of the
area.  

$$

MNZ020-037-WIZ001-071700-
/O.EXT.KDLH.FG.Y.0021.000000T0000Z-211007T1700Z/
Southern Lake-Carlton and South St. Louis-Douglas-
Including the cities of Two Harbors, Silver Bay, Duluth, 
and Superior
959 AM CDT Thu Oct 7 2021

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL NOON CDT TODAY...

* WHAT...Visibility less than one mile in dense fog.

* WHERE...In Wisconsin, Douglas County. In Minnesota, Carlton 
  and South St. Louis and Southern Lake Counties. This includes 
  the Tribal Lands of the Fond du Lac Band.

* WHEN...Until noon CDT today.

* IMPACTS...Hazardous driving conditions due to low visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

521 
WWUS73 KDLH 071704
NPWDLH

URGENT - WEATHER MESSAGE
National Weather Service Duluth MN
1204 PM CDT Thu Oct 7 2021

MNZ020-037-WIZ001-071815-
/O.EXP.KDLH.FG.Y.0021.000000T0000Z-211007T1700Z/
Southern Lake-Carlton and South St. Louis-Douglas-
Including the cities of Two Harbors, Silver Bay, Duluth, 
and Superior
1204 PM CDT Thu Oct 7 2021

...DENSE FOG ADVISORY HAS EXPIRED...

Fog has dissipated for much of the area, so the Advisory has been
allowed to expire.

$$

Area Forecast Discussion
National Weather Service Duluth MN
1240 PM CDT Wed Oct 6 2021

.DISCUSSION...(Today through Tuesday)
Issued at 351 AM CDT Wed Oct 6 2021

Summary: Quiet and mild weather today except for some areas of
fog, especially near Lake Superior. Some rain chances move in as
early as Thursday, but better chances on Friday and into the
weekend. Temperatures cool off a bit next week.

Fog and low stratus continue to persist over a good portion of the
region this morning, particularly across the Arrowhead, near Lake
Superior, and into parts of northwest Wisconsin. A warm air mass
aloft with persistent southerly return flow is trapping low-level
moisture near the surface, and with the aid of a light easterly
component over Lake Superior, the fog and stratus is not likely to
disappear quickly today, even after sunrise, though it will
gradually lift for most areas going into the afternoon. Aside from
the fog, temperatures will remain mild today with highs right
around 70 degrees with some sunshine developing. Surface high
pressure centered east of Lake Superior with elongated low
pressure over the western Dakotas will create a tightening
pressure gradient especially over western Minnesota. This may
cause some gusty southerly winds for western parts of the region
today.

More fog, dense at times, is likely tonight especially near Lake
Superior, but otherwise quiet weather is expected. A closed low
over the south-central states will move north on Thursday into
Friday, bringing a stream of moist air up to the region and
introducing a chance for showers mainly for southern parts of the
region on Thursday. A better chance for showers and possibly a few
thunderstorms will occur on Friday with a bit more instability in
place.

A potentially larger system may impact parts of the region over
the weekend as a Colorado low deepens associated with a potent
upper level trough. This could bring some windy conditions,
periods of moderate to heavy rain to some places, and a few
thunderstorms. There remains a good amount of uncertainty with
this system as far as timing and intensity, so expect some
forecast changes in the coming days. Temperatures are likely to
cool off a bit behind this system going into early next week.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 1235 PM CDT Wed Oct 6 2021

Stratus is starting to thin, and is being replaced by diurnal
cumulus for all the sites except INL. These diurnal clouds will
bring MVFR conditions at times. More fog is expected tonight, and
is mainly expected to affect DLH and HIB, with visibilities
getting down to 1/4SM late tonight. Fog will linger through most
of the morning at HIB and DLH, similar how we have seen the past
few days.

&&

.MARINE...
Issued at 1023 AM CDT Wed Oct 6 2021

No major issues anticipated in the next 48 hours involving winds
or wave heights. Departing high pressure will keep winds light
from the east with wave heights two feet or less. Fog is likely to
be a periodic issue today and again tonight over the nearshore
waters of Lake Superior. Dense Fog Advisories are in effect for
nearshore zones along the North Shore until noon Thursday. The
latest weather models suggest that the fog may persist into
Friday. An area of low pressure approaching the region from the
southwest over the weekend may result in some stronger winds,
which may create conditions that could be hazardous for small
craft.

&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  67  55  67  56 /  10  10  20  40
INL  74  56  72  57 /   0   0  10  30
BRD  71  57  70  57 /   0  10  20  30
HYR  71  52  70  56 /   0  10  30  40
ASX  72  51  72  55 /  10  10  20  40

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
LS...Dense Fog Advisory until noon CDT Thursday for LSZ140>143.

&&

DISCUSSION...JDS
AVIATION...Kossen
MARINE...Kossen

Hazardous Weather Outlook
National Weather Service Duluth MN
1136 AM CDT Wed Oct 6 2021

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-071645-
Koochiching-North St. Louis-Northern Cook/Northern Lake-
North Itasca-Central St. Louis-Southern Lake/North Shore-
Southern Cook/North Shore-North Cass-South Itasca-South Cass-
Crow Wing-Northern Aitkin-South Aitkin-Carlton/South St. Louis-
Pine-Douglas-Bayfield-Ashland-Iron-Burnett-Washburn-Sawyer-Price-
1136 AM CDT Wed Oct 6 2021

This Hazardous Weather Outlook is for portions of northeast
Minnesota and northwest Wisconsin.

.DAY ONE...This afternoon and Tonight

Fog is expected to form again tonight near Lake Superior.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Periodic thunderstorms are possible Thursday night through the
weekend.

.SPOTTER INFORMATION STATEMENT...

Skywarn spotter activation will not be needed this afternoon or
tonight.

LSZ121-140>148-150-071645-
Bayfield to Oak Point WI-Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-Two Harbors to Duluth MN-
Duluth MN to Port Wing WI-Port Wing to Sand Island WI-
Sand Island to Bayfield WI-Oak Point to Saxon Harbor WI-
Outer Apostle Islands Beyond 5 NM from Mainland-
1136 AM CDT Wed Oct 6 2021

This Hazardous Weather Outlook is for portions of Lake Superior
and the Nearshore waters of western Lake Superior.

.DAY ONE...This afternoon and Tonight

Areas of dense fog are expected over portions of western Lake
Superior with visibility less than 1 nautical mile. Visibility
less than one- quarter nautical mile is possible near the
shoreline. A Dense Fog Advisory is in effect for areas where
visibility will be lowest.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

A few thunderstorms are possible this weekend.

LE

More information may be obtained at the following web address:
http://www.weather.gov/duluth (all lower case)