Small Craft Advisory 62, NWS Gaylord, MI

422 
WHUS73 KAPX 121938
MWWAPX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GAYLORD MI
338 PM EDT WED JUL 12 2017

LHZ345-347-122045-
/O.CAN.KAPX.SC.Y.0062.000000T0000Z-170712T2300Z/
STRAITS OF MACKINAC WITHIN 5 NM OF MACKINAC BRIDGE INCLUDING
MACKINAC ISLAND-
5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LIGHT MI INCLUDING
BOIS BLANC ISLAND-
338 PM EDT WED JUL 12 2017

...SMALL CRAFT ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS CANCELLED THE SMALL
CRAFT ADVISORY. 

$$

LHZ346-LSZ322-130345-
/O.CON.KAPX.SC.Y.0062.000000T0000Z-170713T1100Z/
ST IGNACE TO FALSE DETOUR CHANNEL-
ST. MARYS RIVER POINT IROQUOIS TO E. POTAGANNISSING BAY-
338 PM EDT WED JUL 12 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 AM EDT
THURSDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 AM EDT THURSDAY.

* PLEASE SEE THE LATEST MARINE FORECASTS FOR MORE DETAILED 
  INFORMATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS 

INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

$$

078 
WHUS73 KAPX 130143
MWWAPX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GAYLORD MI
943 PM EDT WED JUL 12 2017

LHZ346-LSZ322-130945-
/O.CON.KAPX.SC.Y.0062.000000T0000Z-170713T1100Z/
ST IGNACE TO FALSE DETOUR CHANNEL-
ST. MARYS RIVER POINT IROQUOIS TO E. POTAGANNISSING BAY-
943 PM EDT WED JUL 12 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 AM EDT
THURSDAY...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 AM EDT THURSDAY.

* PLEASE SEE THE LATEST MARINE FORECASTS FOR MORE DETAILED 
  INFORMATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS 

INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

$$

590 
WHUS73 KAPX 130827
MWWAPX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GAYLORD MI
427 AM EDT THU JUL 13 2017

LHZ345-347-348-LMZ341-342-131630-
/O.EXB.KAPX.SC.Y.0062.000000T0000Z-170714T0000Z/
STRAITS OF MACKINAC WITHIN 5 NM OF MACKINAC BRIDGE INCLUDING
MACKINAC ISLAND-
5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LIGHT MI INCLUDING
BOIS BLANC ISLAND-
PRESQUE ISLE LIGHT TO STURGEON PT MI INCLUDING THUNDER BAY
NATIONAL MARINE SANCTUARY-
SEUL CHOIX POINT TO 5NM WEST OF MACKINAC BRIDGE-
NORWOOD MI TO 5NM WEST OF MACKINAC BRIDGE INCLUDING LITTLE
TRAVERSE BAY-
427 AM EDT THU JUL 13 2017

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS ISSUED A SMALL CRAFT
ADVISORY...WHICH IS IN EFFECT UNTIL 8 PM EDT THIS EVENING. 

* PLEASE SEE THE LATEST MARINE FORECASTS FOR MORE DETAILED 
  INFORMATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS 

INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

$$

LHZ346-LSZ322-131630-
/O.EXT.KAPX.SC.Y.0062.000000T0000Z-170714T0000Z/
ST IGNACE TO FALSE DETOUR CHANNEL-
ST. MARYS RIVER POINT IROQUOIS TO E. POTAGANNISSING BAY-
427 AM EDT THU JUL 13 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

THE SMALL CRAFT ADVISORY IS NOW IN EFFECT UNTIL 8 PM EDT THIS
EVENING. 

* PLEASE SEE THE LATEST MARINE FORECASTS FOR MORE DETAILED 
  INFORMATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS 

INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

$$

229 
WHUS73 KAPX 131450
MWWAPX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GAYLORD MI
1050 AM EDT THU JUL 13 2017

LHZ345>348-LMZ341-342-LSZ322-132300-
/O.CON.KAPX.SC.Y.0062.000000T0000Z-170714T0000Z/
STRAITS OF MACKINAC WITHIN 5 NM OF MACKINAC BRIDGE INCLUDING
MACKINAC ISLAND-ST IGNACE TO FALSE DETOUR CHANNEL-
5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LIGHT MI INCLUDING
BOIS BLANC ISLAND-
PRESQUE ISLE LIGHT TO STURGEON PT MI INCLUDING THUNDER BAY
NATIONAL MARINE SANCTUARY-
SEUL CHOIX POINT TO 5NM WEST OF MACKINAC BRIDGE-
NORWOOD MI TO 5NM WEST OF MACKINAC BRIDGE INCLUDING LITTLE
TRAVERSE BAY-
ST. MARYS RIVER POINT IROQUOIS TO E. POTAGANNISSING BAY-
1050 AM EDT THU JUL 13 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

A SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING. 

* PLEASE SEE THE LATEST MARINE FORECASTS FOR MORE DETAILED 
  INFORMATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS 

INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

$$

422 
WHUS73 KAPX 131936
MWWAPX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GAYLORD MI
336 PM EDT THU JUL 13 2017

LHZ345>348-LMZ341-342-LSZ322-132045-
/O.CAN.KAPX.SC.Y.0062.000000T0000Z-170714T0000Z/
STRAITS OF MACKINAC WITHIN 5 NM OF MACKINAC BRIDGE INCLUDING
MACKINAC ISLAND-ST IGNACE TO FALSE DETOUR CHANNEL-
5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LIGHT MI INCLUDING
BOIS BLANC ISLAND-
PRESQUE ISLE LIGHT TO STURGEON PT MI INCLUDING THUNDER BAY
NATIONAL MARINE SANCTUARY-
SEUL CHOIX POINT TO 5NM WEST OF MACKINAC BRIDGE-
NORWOOD MI TO 5NM WEST OF MACKINAC BRIDGE INCLUDING LITTLE
TRAVERSE BAY-
ST. MARYS RIVER POINT IROQUOIS TO E. POTAGANNISSING BAY-
336 PM EDT THU JUL 13 2017

...SMALL CRAFT ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS CANCELLED THE SMALL
CRAFT ADVISORY. 

$$

Area Forecast Discussion
National Weather Service Gaylord MI
340 AM EDT Wed Jul 12 2017

.NEAR TERM...(Today through Tonight)
Issued at 339 AM EDT Wed Jul 12 2017

...Wet/stormy weather ahead...

High impact weather potential...Strong/svr t-storms with heavy
rain possible.

Warm front slowly lifting into central lower MI, as low pressure
evolves in the central and northern plains. Some showers are seen
north of this front, over eastern upper and far northern lower MI.
More vigorous MCSs are lined up from Michiana to MN. As an upper
trof axis gets dragged ese toward Superior tonight, a surface low
will slowly cross central/northern lower MI this evening. This is
certainly a set-up for some wet wx for some, but is it a svr/heavy
rain set-up, with so much activity lined up to our south?

Probably. We are (unexpectedly) not on tap for an early morning
MCS to cross northern MI early this morning, with the most
vigorous activity remaining to our s and w. That should help the
axis of more active wx to lift northward with time, as low
pressure consolidates somewhat to our w. By this afternoon and
evening, we (northern lower MI in particular) should be in a
favorable location for reasonably vigorous convective clusters to
move (perhaps train) ese across the region. Instability plume will
be most prominent in WI, but MlCape values should reach 1.5 k/kg
in the sw third of this forecast area. 0-6km bulk shear values are
quite healthy thru 21z (40-45kt), before falling off a bit after
that. There isn't an obvious focusing mechanism within a broad w-e
corridor of potential svr wx (per SPC day 1 outlook), but placing
a small risk of svr in sw sections is reasonable. In addition,
surface winds are quite backed in vicinity of and (of course)
north of the warm front. Storms in it's vicinity will have
sufficient low-level shear for rotation, and low LCL heights. We
may have a sneaky tornado threat emerge, and SPC has drawn in a
small outlook area for said threat.

There are also heavy rain concerns, again especially in northern
lower MI. This airmass has been a heavy rain producer at times,
and a stalling warm front is generally favorable for some training
convective clusters. The far se section of this forecast area is
more flood-prone than elsewhere, had a significant flood event
about 2 1/2 weeks ago, and a healthy rainfall event 4-5 days ago.
Flash flood guidance values are actually fairly high (around 2
inches per hour), perhaps too much so? Per coord with DTX, will be
posting a flood watch for W Branch and points s and e this
afternoon and tonight.

Highest pops will be from noon to midnight. The departure of the
surface low overnight leaves us in a still- moist airmass but
rather lacking in synoptic support. Pops will diminish, but not
end, overnight.

Max temps only mid/upper 60s eastern upper MI, while pushing into
the lower 80s TVC area and down by Gladwin. Min temps mid 50s
north to mid 60s far south.

&&

.SHORT TERM...(Thursday through Friday)
Issued at 339 AM EDT Wed Jul 12 2017

...Showers Thursday, Dry Friday...

High Impact Weather Potential...Thunder on Thursday afternoon
doesn't look likely, but there is a chance.

Pattern Synopsis/Forecast...thursday looks like scattered showers in
the morning with the chance for thunder in the afternoon as as the
main wave/front sags south along the southern border of the forecast
area. Dry air begins to push in late in the day, especially in
the 700-500 mb layer, which could dry things out, except for the
500 mb low in Lake Superior, which is expected to move east and
into Ontario by 12z/Fri. The 500 mb low moves out of the Upper
Great Lakes and the sfc high builds into the region. So will
expect that day will be dry. The high moves east, and the next
system begins to descend into the Upper Great Lakes, so the
clouds will begin to push into Upper Michigan early Saturday
morning, but the precipitation looks to remain over Lake Superior.

Primary Forecast concerns...Will there be thunder Thursday
afternoon? the models show some modest MLCAPE for the afternoon in
NE Lower, so will leave the chance in, but think that for the most
part, it will be showers as the. The other thing will be if there
will be showers Thursday night into Friday as the 500 mb low moves
east to the north of the forecast area. ECMWF is the most bullish
with this, the GFS less so with the Dry air in the layer stopping
most of the rain. SREF plumes barely shows precipitation, so think
that there is a good chance that the Thursday night into Friday
morning could turn out dry.

&&

.LONG TERM...(Friday night through Tuesday)
Issued at 339 AM EDT Wed Jul 12 2017

...Weekend showers gives way to sunshine next week...

High Impact Weather Potential...None

Extended (Saturday through Tuesday)...Saturday, Looks like a quick
cold front and 500 mb wave that pushes through the region, and
mainly overnight and into Sunday morning. Things look like they dry
out for Sunday as the models are in better agreement. In fact it
looks like it will be more on the dry side through Monday. Tuesday
the next wave threatens, although the ECMWF shows it dry as the main
forcing gets pulled apart with the 500 mb jet north of Lake Superior
and the a flat ridge over the Plains, and Upper Great Lakes. GFS
breaks the ridge down a bit and tries to bring rain into the region
Tuesday night.

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1145 PM EDT Tue Jul 11 2017

VFR conditions will diminish to MVFR overnight due to shower
activity and some patchy fog development. Low VFR/MVFR conditions
are expected on Wednesday as better chances of showers and lower
cigs develop ahead of low pressure pushing eastward into the
Western Great Lakes region. Light/variable winds overnight will
become S/SE AOB 10 kts on Wednesday.

&&

.MARINE...
Issued at 339 AM EDT Wed Jul 12 2017

Easterly winds will increase this morning, ahead of low pressure
advancing toward the upper MS Valley. Gustiest winds will occur
over far northern Lake Huron, on up into Whitefish Bay. Will be
evaluating the need for any advisories shortly. Somewhat breezy e
to ne winds will continue on our waters into Thursday.

&&

.APX WATCHES/WARNINGS/ADVISORIES...
MI...FLOOD WATCH from noon EDT today through late tonight for MIZ035-
     036-041-042.
LH...NONE.
LM...NONE.
LS...NONE.
&&

NEAR TERM...JZ
SHORT TERM...JL
LONG TERM...JL
AVIATION...MR
MARINE...JZ

Hazardous Weather Outlook
National Weather Service Gaylord MI
359 AM EDT Wed Jul 12 2017

LHZ345>349-LMZ323-341-342-344>346-LSZ321-322-MIZ008-015>036-041-
042-131200-
Straits of Mackinac within 5 nm of Mackinac Bridge including
Mackinac Island-St Ignace to False Detour Channel-
5NM East of Mackinac Bridge to Presque Isle Light MI including
Bois Blanc Island-
Presque Isle Light to Sturgeon Pt MI Including Thunder Bay
National Marine Sanctuary-Sturgeon Pt to Alabaster MI-
Grand Traverse Bay south of a line Grand Traverse Light to
Norwood MI-Seul Choix Point to 5NM West of Mackinac Bridge-
Norwood MI to 5NM West of Mackinac Bridge including Little
Traverse Bay-Sleeping Bear Point to Grand Traverse Light MI-
Point Betsie to Sleeping Bear Point MI-
Manistee to Point Betsie MI-
Whitefish Bay (U.S. Portion)/Whitefish Point to Point Iroquois MI-
St. Marys River Point Iroquois to E. Potagannissing Bay-Chippewa-
Mackinac-Emmet-Cheboygan-Presque Isle-Charlevoix-Leelanau-Antrim-
Otsego-Montmorency-Alpena-Benzie-Grand Traverse-Kalkaska-Crawford-
Oscoda-Alcona-Manistee-Wexford-Missaukee-Roscommon-Ogemaw-Iosco-
Gladwin-Arenac-
359 AM EDT Wed Jul 12 2017

This hazardous weather outlook is for northern Lower Michigan...
eastern Upper Michigan...and adjacent nearshore waters of Lake
Michigan...Lake Huron and Lake Superior.

.DAY ONE...Today and tonight.

Scattered thunderstorms are expected, diminishing overnight.
Severe thunderstorms will be possible between noon and midnight,
south of a line from Charlevoix, to Grayling, to Tawas City.
Damaging wind gusts, large hail, and isolated tornadoes will be
possible with any severe storms.

In addition, locally heavy rainfall is possible. Rainfall amounts
of 1 to 3 inches will occur in parts of northern lower Michigan,
with potentially locally higher amounts. Localized flooding may
result, especially in the more flood-prone locations near Saginaw
Bay. See the ongoing flood watch for details.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Additional thunderstorms will be possible Saturday afternoon into
Saturday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required today and tonight.

Spotters are encouraged to report any significant weather and
rainfall amounts to the National Weather Service. Reports may be
made one of three ways:

Online:   weather.gov/gaylord
Facebook: facebook.com/nwsgaylord
Twitter: twitter.com/nwsgaylord

&&

For more information visit http://weather.gov/gaylord.

JZ