Thursday, June22, 2017 L-36.com


Marine Weather and Tides
Sebewaing, MI

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:53AMSunset 9:22PM Thursday June 22, 2017 7:50 PM EDT (23:50 UTC) Moonrise 3:49AMMoonset 6:41PM Illumination 2% Phase: Waning Crescent; Moon at 28 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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LHZ422 Inner Saginaw Bay Sw Of Point Au Gres To Bay Port Mi- 411 Pm Edt Thu Jun 22 2017
Tonight..Southwest winds 10 to 15 knots diminishing to 5 to 10 knots...then increasing to 10 to 15 knots after midnight. A chance of showers and Thunderstorms early in the evening...then showers with Thunderstorms likely in the late evening and overnight. Waves around 2 feet or less.
Friday..North winds 10 to 15 knots becoming northwest 5 to 10 knots in the late morning and early afternoon...then backing to the west late in the afternoon. Cloudy in the morning becoming partly cloudy. Showers and Thunderstorms likely early in the morning...then a chance of showers and Thunderstorms in the late morning and early afternoon. A slight chance of showers and Thunderstorms late in the afternoon. Waves around 2 feet or less.
Friday night..West winds 10 to 15 knots becoming northwest 5 to 10 knots early in the morning. Mostly clear. Waves around 2 feet or less.
Saturday..Northwest winds 5 to 10 knots becoming west 10 to 15 knots in the late morning and afternoon. Mostly Sunny early in the morning becoming partly cloudy. A chance of light showers in the afternoon. Waves around 2 feet or less. SEe lake huron open lake forecast for days 3 through 5.
LHZ422 Expires:201706230315;;653363 FZUS53 KDTX 222011 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 411 PM EDT Thu Jun 22 2017 For waters within five nautical miles of shore Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. LHZ422-230315-

7 Day Forecast for Marine Location Near Sebewaing, MI
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location: 43.76, -83.68     debug


Area Discussion for - Gaylord, MI
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Fxus63 kapx 221918
afdapx
area forecast discussion
national weather service gaylord mi
318 pm edt Thu jun 22 2017

Near term (tonight through Friday)
issued at 316 pm edt Thu jun 22 2017
high impact weather potential: showers and thunderstorms with
potential heavy rainfall. A few storms may be severe with damaging
winds and large hail the threats. Need to monitor rivers for
potentially higher rises if total QPF through the night happens to
near a couple inches.

Pattern synopsis and forecast:
fast westerly flow aloft continues over the area with the next in a
series of shortwaves pressing through wisconsin, spreading an axis
of deeper moisture (pwats now in the 1.75" to 2.00" range) through
the western great lakes. This out ahead of a cold front that
stretched from central lake superior through NW wisconsin. Low to
mid level WAA and additional upper divergence was helping to expand
showers and a few thunderstorms ahead of the front. Not much else
has developed from anything diurnally driven despite NRN lower
blcapes 1000-1500j kg (less in eastern upper), as there is a lack of
a focusing mechanism, aided by the fact there was some subsidence
warming aloft from behind this mornings rainfall. Low clouds have
held tough most of the day from roughly m-32 north, keeping heating
at a minimum, with the warmer readings south of there, reaching the
upper 70s to lower 80s.

Heading through the late afternoon and evening hours, am expecting
showers to expand further as the aforementioned forcing moves in
over the region, and while the LLJ will try to strengthen, back some
ahead of the shortwave, and result in increasing low level
convergence. Mucapes do not appear to wanna eclipse more than 1200
j kg across the SRN cwa, with much less instability further north,
especially into eastern upper. Still looking at a marginal risk for
a severe storm or two m-32 south, with slight risk scraping portions
of m-55 corridor. Damaging winds to 60 mph and large hail to 1 inch
still the threats. Heavy rainfall appears to be the main player here
with such a moist air mass. Expect periods of very heavy rain,
focused more so in the evening to maybe a few hours past midnight.

Many areas of NRN lower, still thinking more likely along and south
of a line from the gtv bay region over to alpena. Could easily see
over an inch of rain in this area. Will need to keep a close eye on
rainfall totals, rfc MAX 48hr contingency forecasts are as high as
2". This would have some impacts on area rivers and streams. As of
right now, there are no significant rises anticipated that would go
into flooding. Rainfall starts to trail off late tonight into Friday
morning, especially as the cold front slowly crosses the region. We
will more than likely have to deal with more low clouds and a little
fog until it passes. Cooler and less humid air and and some fairly
decent drying are expected to lead to a great Friday afternoon with
only some high based scattered cumulus. Large scale upper troughing
slides south toward eastern upper tomorrow afternoon with some
colder temperatures aloft combining with secondary sfc troughing,
for the potential of a few showers. This is a low chance low
confidence setup.

Very mild night SE CWA with mid to upper 60s for lows, while cooler
mid and upper 50s across eastern upper. Highs tomorrow in the 70s.

Short term (Friday night through Sunday)
issued at 316 pm edt Thu jun 22 2017

Cooler with (mainly) daytime showers storms...

high impact weather potential... Low risk for not severe
thunderstorms Saturday and Sunday afternoon.

Pattern synopsis forecast... Long wave troughing persists across much
of canada and into the northern plains great lakes region with long
wave ridging building northward along the west coast... Toward the
gulf of alaska. Closed occluding low pressure short wave energy
moving through the mean trough is sliding through south-central
canada... With an occluded cold front arcing into the upper midwest
then back to secondary low pressure in the central plains. Occluded
low pressure system slides through ontario far northern lakes region
through Friday kicking the front through the state. Cooler weather
arrives for the weekend along with the possibility for daytime
instability showers possibly thunder... With shower activity
augmented by the passage of a secondary short wave late Saturday
night into Sunday.

Primary forecast concerns... Minimal. There will be a low end risk
for thunderstorms Saturday afternoon and a little better chance for
thunderstorms Sunday afternoon... With daytime heating and as colder
air aloft slides over the region (core of -22c 500 mb air moves
through Sunday). Best chances will likely be across north-central
and northeast lower michigan with prevailing westerly flow. But
aside from any brief pulse-severe hailer with low wet-bulb zero
heights... Severe weather risk will be minimal.

Otherwise... Cool once again through Sunday with high temperatures in
the middle 60s to around 70 both days (coolest on Sunday) and a good
10 to 15 degrees below normal.

Long term (Sunday night through Thursday)
issued at 316 pm edt Thu jun 22 2017
the extended forecast, Monday through Thursday, indicates a slow
warming trend across the great lakes next week, with a few rounds of
rain showers expected.

At upper levels, a broad upper trough which settled over the great
lakes and hudson bay during the weekend, will slowly exit east of
the region Wednesday, while an upper ridge strengthens over the
plains and pushes into the state Thursday. 850mb temps in this
pattern will warm from around 5c to begin the upcoming work week, to
around 12c Thursday in the developing upper ridge. The upper lvl
pattern will help surface temperatures warm from below normal
readings in the upper 60s to around 70 degrees thru Tuesday, before
warming into the mid 70s Thursday.

Aviation (for the 18z tafs through 18z Friday afternoon)
issued at 126 pm edt Thu jun 22 2017
MVFR CIGS likely to hold on across pln apn further into the
afternoon, before conditions really start deteriorating late this
afternoon through this evening, as cold front slowly slides into
nrn michigan. The air mass is already quite moist, and further
moisture advection ahead of the front, combined with a disturbance
aloft, will result in definite rains moving in over the airports.

Best instability will reside south, so better thunderstorm chances
tvc mbl. Only a small chance for a severe storm with damaging
winds and large hail being the threats, but as these storms roll
through, heavy rainfall is the more likely expectation, with well
over an inch of rain possible. Temporary MVFR ifr conditions in
the stronger rain storms, with more solid MVFR ifr CIGS sweeping
through overnight into Friday morning. Should see these low clouds
and fog quickly dissipate toward the end of the TAF period as the
cold front passes.

Marine
Issued at 316 pm edt Thu jun 22 2017
gradient winds and waves not expected to be of any issue over the
next several days. Generally southerly winds will turn more westerly
overnight into Friday morning behind the passing of a cold front.

Gusty and erratic winds will be possible within periods of showers
and scattered thunderstorms that will be associated with this front,
with the strongest of activity this evening to a few hours past
midnight. There is a small chance for a storm or two to become
severe across the SRN nearshore waters, but that chance is fairly
low. Expect some very heavy rainfall however. Skies open up through
the day Friday, with cooler and drier air increasing over the
region. Additional scattered showers and a few potential storms
through the weekend, mainly in the afternoons.

Apx watches warnings advisories
Mi... None.

Lh... None.

Lm... None.

Ls... None.

Near term... Smd
short term... Tba
long term... Swr
aviation... Smd
marine... Smd


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SBLM4 - Saginaw Bay Light #1, MI 4 mi50 min WSW 12 G 13 77°F 1006.1 hPa (-1.0)
45163 16 mi50 min SW 7.8 G 7.8 72°F 66°F1 ft
GSLM4 - Gravelly Shoals Light MI 19 mi50 min SSW 17 G 22 76°F 1007.5 hPa (-1.3)
TAWM4 - Tawas City, MI 36 mi70 min S 6 G 8.9 65°F 1006.4 hPa

Wind History for Harbor Beach, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Caro, Tuscola Area Airport, MI24 mi56 minW 610.00 miFair81°F70°F71%1007.4 hPa

Wind History from CFS (wind in knots)
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Last 24hrS4CalmCalmCalmCalmCalmCalmCalmSE4SE3SE6SE5N4SE5CalmS3S3S3SW3W9
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1 day agoSW5SW3SW4S3CalmCalmCalmCalmCalmCalmCalmCalmW3NW4N4NW3CalmN3N3CalmNW3CalmS6SW4
2 days agoCalmSW3SW4SW3W5CalmSW5SW4SW7SW6SW6SW6SW7SW8W9
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of GreatLakes    EDIT
Geos

Wind Forecast for Gaylord, MI (19,4,5,8)
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Ground Weather Radar Station Detroit, MI
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weather_mapweather_map weather_map

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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.