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2 products issued by NWS for: 7NM NE Grosse Pointe MI
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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
349 PM EDT Thu Sep 20 2018

LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-212000-
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt
beyond 5 NM off shore-
Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM
off shore-
Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore-
Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw
Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI-
Port Austin to Harbor Beach MI-Harbor Beach to Port Sanilac MI-
Port Sanilac to Port Huron MI-
Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore-
Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore-
Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore-
349 PM EDT Thu Sep 20 2018

This hazardous weather outlook is for portions of Lake Erie, Lake
Huron and Lake St Clair.

.DAY ONE...This Afternoon and Tonight

There is a Marginal Risk for severe weather today across southeast
Michigan. An isolated thunderstorm producing damaging winds will be
possible now through this evening. Greatest severe threat will be
during the afternoon hours.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Gale Warnings in effect Friday through Friday night. Please refer to
Lake Huron forecast for additional information.

.SPOTTER INFORMATION STATEMENT...

$$

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.

TF



Small Craft Advisory

URGENT - MARINE WEATHER MESSAGE
National Weather Service Detroit/Pontiac MI
347 PM EDT Thu Sep 20 2018

...GUSTS TO GALES EXPECTED FRIDAY AND FRIDAY NIGHT...

.A seasonably strong low pressure system will track across the
northern Great Lakes tonight and into Friday, initially lifting a
warm front through lower Michigan today into tonight before dragging
a strong cold front eastward across the region Friday. Scattered
showers and a few thunderstorms will accompany the low pressure
system, along with rapidly worsening marine conditions. A Gale
Warning is now in effect for all of Lake Huron midday Friday through
Friday night, with Small Craft Advisories in effect for Lake St.
Clair and western Lake Erie. A rush of warm air behind the warm
front will initially hamper peak wind gusts out of the southwest
tonight into Friday morning at or below 30 knots, but as colder air
rushes in behind the cold front passage under northwest flow, gusts
will reach gale force across all of the Lake Huron waters, peaking
around 40 knots by Friday afternoon. The strong winds will lead to
rapidly increasing waves over the open Lake Huron waters as well,
with peak wave heights exceeding 10 feet over northern and central
Lake Huron. High pressure will then build in quickly behind this
system by Saturday, bringing improved marine conditions during the
weekend.

LCZ460-LEZ444-210800-
/O.EXT.KDTX.SC.Y.0055.180921T1200Z-180922T0400Z/
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
347 PM EDT Thu Sep 20 2018

...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 8 AM FRIDAY TO
MIDNIGHT EDT FRIDAY NIGHT...

The Small Craft Advisory is now in effect from 8 AM Friday to
midnight EDT Friday night.

* WIND AND WAVES: During the Small Craft Advisory, expect
  sustained winds up to 20 knots from the northwest with gusts
  up to 33 knots. The largest expected significant waves will
  be 4 feet with a potential maximum wave height of 5 feet.

* TIMING: The maximum winds are expected around 8 PM EDT Friday
  with the largest waves expected around 12 PM EDT Friday.

Refer to the latest marine forecasts for greater detail.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
are expected to produce hazardous wave conditions to small craft.
Inexperienced mariners...especially those operating smaller
vessels should avoid navigating in these conditions.

&&

$$

TF



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