Special Weather Statement, NWS Duluth, MN

Area Forecast Discussion
National Weather Service Duluth MN
146 PM CDT Fri Aug 4 2017

.UPDATE...
Issued at 144 PM CDT Fri Aug 4 2017

Updated to increase the pops based on current radar and forecast
trends. A weak shortwave is moving through NE MN causing
thunderstorms to develop. Some of the storms have 30 mph and
small hail with them. The precip should dissipate after sunset.

UPDATE Issued at 1019 AM CDT Fri Aug 4 2017

Added a mention of thunderstorms this morning to Koochiching
county as storms are developing just over the Canadian border.
These storms will drift south of the border into the county.

UPDATE Issued at 913 AM CDT Fri Aug 4 2017

Skies have cleared over the western half of the forecast area this
morning, while hanging tough elsewhere. More clouds over the
Canadian border are beginning to stream over the Borderland and
will eventually move across the area. Cumulus clouds will also
develop where the sun is abundant at this moment and fill in.
Updated the sky cover and made other minor adjustments.

&&

.SHORT TERM...(Today through Saturday)
Issued at 311 AM CDT Fri Aug 4 2017

The upper low was over northern Wisconsin with the surface low
centered over the central Upper Peninsula as of 08Z. These
features will continue to move east today. Showers were occurring
over much of the Northland, most numerous over northwest
Wisconsin. The showers will diminish through the morning ending
for most areas for a time. Continued cyclonic flow, steep lapse
rates, and a shortwave moving through in north-northwest flow
aloft will all contribute to more showers and a few thunderstorms
this afternoon into the evening hours. Highs today will range from
the mid to upper sixties over the Arrowhead into
Iron/Price/Ashland Counties, to 70 to 75 elsewhere.

The showers will end tonight with diminishing cloud cover. Winds
will become light overnight and that will aid in developing fog as
the night progresses. It will be cool with lows from 45 to 53.

Cooler temperatures aloft will continue into Saturday with mainly
light forcing. There will again be a chance for showers and a few
thunderstorms in the afternoon for most areas with chances highest
over southern portions of the Northland. Highs will be in the
upper sixties to middle seventies.

.LONG TERM...(Saturday night through Thursday)
Issued at 311 AM CDT Fri Aug 4 2017

The extended forecast is highlighted with a mainly dry period,
except for a few shots of showers and storms. Temperatures should be
either right around or slightly below normal for the following week.

Saturday night/Sunday morning should be mostly dry across the
Northland, except for some small chances of showers, and maybe a
thunderstorm, mainly over our southern counties. A mid-level
shortwave is progged to translate just to our south, so some small
chances of showers/storms will be associated with this wave. Skies
might be mostly clear across the International Border, away from the
shortwave, so there is the potential for some fog in these areas
where there's less cloud cover and light winds. Another night of
good fog potential will exist Monday morning too as high pressure
builds into the region from the Canadian Prairies.

Chances of showers and storms will persist through the day Sunday
before said high pressure moves into the region. Conditions will
remain dry through Monday night before another shortwave moves in.
This wave will be accompanied by a sfc cool front boundary, which
will be the focusing mechanism for showers and storms. This boundary
will be pretty slow moving, so chances of precipitation will persist
through the day Tuesday and Wednesday. At this time, no severe
weather is expected with this round of storms as instability and
deep layer shear seems too low to support strong and organized
updrafts. The cold front should exit the region by Wednesday
evening. Synoptic models differ on the amount of QPF associated with
this front, so will leave specific amounts out of this discussion,
but a wetting rainfall will be possible in some locations. The
remainder of the extended forecast period looks to be quiet once
again as sfc high pressure builds back into the region.

Temperatures through the extended forecast period will be either
near or slightly below average. High temperatures will be in the
lower to mid 70s, with lows in the upper 40s and lower 50s, so
temperatures will be a bit cooler during the overnight periods,
especially for Sunday and Monday mornings.

&&

.AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon)
Issued at 1220 PM CDT Fri Aug 4 2017

Mainly VFR at all airports this afternon and evening through 03z.
There will be a chance for widely scattered showers/thunderstorms
with MVFR conditions as a weak upper level disturbance moves
through the region. Skies will be VFR through 07z when morning fog
may develop at all sites. If it develops, conditions may drop to
MVFR. All sites will be VFR by 14z Saturday.

&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  71  54  73  53 /  50  20  40  20
INL  73  50  73  49 /  50  30  20  10
BRD  74  55  75  53 /  10  10  30  20
HYR  68  50  74  52 /  80  40  30  20
ASX  69  53  75  53 /  90  20  10  20

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
LS...Small Craft Advisory until 4 PM CDT this afternoon for LSZ148.

&&

UPDATE...Stewart
SHORT TERM...Melde
LONG TERM...JTS
AVIATION...Stewart

Hazardous Weather Outlook
National Weather Service Duluth MN
1042 AM CDT Fri Aug 4 2017

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-051030-
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-
1042 AM CDT Fri Aug 4 2017

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

.DAY ONE...Today and Tonight

A few thunderstorms are possible through this evening. The storms
are not expected to be severe.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Small chances for thunderstorms are expected to exist during the
afternoon and early evening hours this weekend and then again
Tuesday into Wednesday. At this time, the threat of any severe
storms appears very low.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotter activation is not anticipated today or tonight but
any reports of heavy rainfall, gusty winds, or hail are
appreciated.

LSZ121-140>148-051030-
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-
1042 AM CDT Fri Aug 4 2017

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

.DAY ONE...Today and Tonight

Strong north to northwest winds gusting to 25 knots at times will
affect the South Shore of western Lake Superior this morning and
afternoon. Associated wave heights will build to between 3 to 5
feet in some places, especially from the Apostle Islands to Saxon
Harbor, resulting in high waves and dangerous conditions for
small craft. Please refer to the latest Nearshore Marine Forecast
and Marine Weather Message for details on a Small Craft Advisory
that remains in affect.

A few thunderstorms are possible this afternoon and early evening.
The storms are not expected to be severe.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Small chances for thunderstorms are expected to exist during the
afternoon and early evening hours this weekend and then again
Tuesday into Wednesday. At this time, the threat of any severe
storms appears very low.

GSF

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

Special Weather Statement
National Weather Service Duluth MN
148 PM CDT FRI AUG 4 2017

MNZ019-026-035-037-041900-
Central St. Louis-Northern Aitkin-Carlton/South St. Louis-South
Itasca-
148 PM CDT FRI AUG 4 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN ITASCA...
NORTHEASTERN AITKIN AND SOUTHWESTERN ST. LOUIS COUNTIES...

At 148 PM CDT, a strong thunderstorm was 7 miles east of Swan River,
or 21 miles south of Hibbing, moving south at 35 mph.

Wind gusts up to 30 mph, half-inch hail, and occasional cloud to
ground lightning can be expected with this storm.

Locations impacted include...
Floodwood, Wawina, Island, Floodwood Lake, and Savanna Portage State
Park.

Seek shelter inside a sturdy building and away from windows until
this storm passes.

If you are on or near one of the many area lakes, get off the water
immediately and seek shelter on shore inside a sturdy building or a
hard-topped vehicle. If possible, stay away from trees.

LAT...LON 4712 9320 4719 9295 4693 9273 4683 9309
TIME...MOT...LOC 1848Z 337DEG 30KT 4709 9304

BJH

Special Weather Statement
National Weather Service Duluth MN
155 PM CDT FRI AUG 4 2017

MNZ011-019-041915-
Central St. Louis-North St. Louis-
155 PM CDT FRI AUG 4 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ST. LOUIS COUNTY...

At 155 PM CDT, a strong thunderstorm was near Cook, or 10 miles west
of Lake Vermilion, moving south at 35 mph.

Wind gusts up to 30 mph, half-inch hail, and occasional cloud to
ground lightning can be expected with this storm.

Locations impacted include...
Lake Vermilion, Mountain Iron, Cook, Angora, Big Rice Lake, Shermans
Corner, and Idington.

Seek shelter inside a sturdy building and away from windows until
this storm passes.

If you are on or near one of the many area lakes, get off the water
immediately and seek shelter on shore inside a sturdy building or a
hard-topped vehicle. If possible, stay away from trees.

LAT...LON 4791 9280 4798 9255 4772 9232 4762 9269
TIME...MOT...LOC 1855Z 337DEG 29KT 4788 9263

BJH

Special Weather Statement
National Weather Service Duluth MN
201 PM CDT FRI AUG 4 2017

MNZ019-035-037-041915-
Central St. Louis-Northern Aitkin-Carlton/South St. Louis-
201 PM CDT FRI AUG 4 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN AITKIN AND
SOUTHWESTERN ST. LOUIS COUNTIES...

At 201 PM CDT, a strong thunderstorm was near Floodwood, or 22 miles
northeast of Big Sandy Lake, moving south at 35 mph.

Wind gusts up to 30 mph, half-inch hail, and occasional cloud to
ground lightning can be expected with this storm.

Locations impacted include...
Floodwood, Gowan, Island, and Savanna Portage State Park.

Seek shelter inside a sturdy building and away from windows until
this storm passes.

If you are on or near one of the many area lakes, get off the water
immediately and seek shelter on shore inside a sturdy building or a
hard-topped vehicle. If possible, stay away from trees.

LAT...LON 4703 9306 4707 9306 4711 9291 4686 9268
      4675 9305 4703 9315
TIME...MOT...LOC 1901Z 337DEG 29KT 4701 9299

BJH

Special Weather Statement
National Weather Service Duluth MN
204 PM CDT FRI AUG 4 2017

MNZ037-WIZ001-041915-
Carlton/South St. Louis-Douglas-
204 PM CDT FRI AUG 4 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL ST. LOUIS AND
NORTHWESTERN DOUGLAS COUNTIES...

At 204 PM CDT, a strong thunderstorm was over Hermantown, or near
Duluth, moving south at 35 mph.

Wind gusts up to 30 mph, half-inch hail, and occasional cloud to
ground lightning can be expected with this storm.

Locations impacted include...
Duluth, Superior, Hermantown, Proctor, Oliver, Wisconsin Point, City
of Rice Lake, Irving, Cody, Park Point, Billings Park, Gary New
Duluth, Morgan Park, Spirit Valley, Central Hillside, Norton Park,
Piedmont Heights, Duluth Heights, Lincoln Park, and Denfeld.

Seek shelter inside a sturdy building and away from windows until
this storm passes.

If you are on or near one of the many area lakes, get off the water
immediately and seek shelter on shore inside a sturdy building or a
hard-topped vehicle. If possible, stay away from trees.

LAT...LON 4683 9234 4690 9210 4679 9201 4678 9203
      4672 9195 4664 9188 4654 9224
TIME...MOT...LOC 1904Z 337DEG 29KT 4680 9219

BJH

Special Weather Statement
National Weather Service Duluth MN
212 PM CDT FRI AUG 4 2017

MNZ035-041930-
Northern Aitkin-
212 PM CDT FRI AUG 4 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN AITKIN COUNTY...

At 212 PM CDT, a strong thunderstorm was near Jacobson, or 11 miles
north of Big Sandy Lake, moving south at 35 mph.

Wind gusts up to 30 mph, half-inch hail, and occasional cloud to
ground lightning can be expected with this storm.

Locations impacted include...
Big Sandy Lake, Libby, Jacobson, Ball Bluff, Balsam, Flowage Lake,
Sheshebee, and Savanna Portage State Park.

Seek shelter inside a sturdy building and away from windows until
this storm passes.

If you are on or near one of the many area lakes, get off the water
immediately and seek shelter on shore inside a sturdy building or a
hard-topped vehicle. If possible, stay away from trees.

LAT...LON 4696 9347 4702 9322 4675 9306 4667 9337
TIME...MOT...LOC 1912Z 338DEG 28KT 4693 9331

BJH

Special Weather Statement
National Weather Service Duluth MN
213 PM CDT FRI AUG 4 2017

MNZ037-WIZ001-041930-
Carlton/South St. Louis-Douglas-
213 PM CDT FRI AUG 4 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL ST. LOUIS AND
NORTHWESTERN DOUGLAS COUNTIES...

At 213 PM CDT, a strong thunderstorm was near Duluth, moving south
at 25 mph.

Wind gusts up to 30 mph, pea-size hail, heavy downpours, and
occasional cloud to ground lightning can be expected with this storm.

This storm will be near...
  Superior around 225 PM CDT.
  Oliver and Wisconsin Point around 230 PM CDT.

Other locations impacted by this storm include Cody, Park Point,
Billings Park, Gary New Duluth, Morgan Park, Congdon Park, Spirit
Valley, Central Hillside, Chester Park, and Norton Park.

Seek shelter inside a sturdy building and away from windows until
this storm passes.

LAT...LON 4664 9224 4683 9229 4688 9210 4678 9202
      4678 9203 4675 9199 4670 9195
TIME...MOT...LOC 1912Z 339DEG 20KT 4679 9218

Huyck