Friday, April20, 2018 L-36.com


Marine Weather and Tides
Port Huron, MI

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:36AMSunset 8:19PM Friday April 20, 2018 11:46 PM EDT (03:46 UTC) Moonrise 9:15AMMoonset 12:00AM Illumination 32% Phase: Waxing Crescent; Moon at 6 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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LHZ443 Port Sanilac To Port Huron Mi- 952 Pm Edt Fri Apr 20 2018
Rest of tonight..Light and variable winds. Mostly clear. Waves around 2 feet or less.
Saturday..Light and variable winds becoming east 5 to 10 knots late in the afternoon. Mostly cloudy in the morning becoming partly cloudy. Waves around 2 feet or less.
Saturday night..Northeast winds 5 to 10 knots early in the evening becoming light and variable. Mostly clear. Waves around 2 feet or less.
Sunday..Light and variable winds becoming northeast 5 to 10 knots in the afternoon. Sunny. Waves around 2 feet or less. SEe lake huron open lake forecast for days 3 through 5.
LHZ443 Expires:201804210900;;259868 FZUS53 KDTX 210155 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 952 PM EDT Fri Apr 20 2018 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. LHZ443-210900-

7 Day Forecast for Marine Location Near Port Huron, MI
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location: 43.04, -82.35     debug


Area Discussion for - Detroit/Pontiac, MI
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Fxus63 kdtx 202238
afddtx
area forecast discussion
national weather service detroit pontiac mi
638 pm edt Fri apr 20 2018

Aviation
High pressure will remain center over the area, providingVFR
conditions throughout the forecast period. Only expect cirrus to
thicken as an upper low lumbers east out of the four corners region
into the southern plains on Saturday and allows for upper level
moisture to spill over upper ridge in place downstream of this
system. Winds will remain very light and quite variable across the
area.

Dtw threshold probabilities
* none.

Prev discussion
Issued at 300 pm edt Fri apr 20 2018
discussion...

temps pretty much on target today rising into the low to mid 50s
except mid upper 40s in the thumb under full insolation. Extremely
dry 12z sounding fully supportive of cloud free skies for the
balance of the afternoon as surface dewpoints have fallen into the
teens with deep diurnal mixing. The dry boundary layer, clear skies,
and a gradient sufficiently weak to allow for decoupling early in
the evening will be supportive of another chilly night. Thin cirrus
already spreading across lake michigan will gradually spread over
the area and thicken through tonight, eventually putting a floor on
low temps in the upper 20s and low 30s per met mav statistical
guidance, which were both on the cooler side of the solution
envelope.

Mid and high clouds are widespread over the central us today in
association with the closed low centered near the 4-corners at press
time. 12z nwp appears to have initialized well with mid upper
tropospheric moisture fields and progged soundings for Saturday
suggest pessimism. Forecast soundings from the GFS indicate full
saturation from the troposphere down to 500mb. Overcast skies will
dominate for the balance of the day across the south. Given
virtually no change in the resident thermal profile from today,
temps have been lowered into the low 50s south of m59. Would not be
entirely surprised to see some locations stuck in the upper 40s, but
will give the mid shift a last minute opportunity to make that
adjustment if needed. Confluent flow pivoting through the great
lakes from the north will force the cloud shield south sufficiently
early in the day to allow temps to rebound in the saginaw valley.

The thumb will be limited by cool onshore flow due to the strong
lake aggregate that will limit mixing depths.

As the closed low meanders from the 4-corners today into the lower
ms valley by late Sunday, northern stream energy will force upper
ridging over the great lakes for the latter half of the weekend.

Subsequent modification of the thermal field may be too late to make
too much of a difference as the 12z GFS indicates 850mb temps will
remain below 0c until 21z Sunday afternoon. Therefore suspect Sunday
will be quite similar to today with no expectation for clouds and
highs only limited by the cool airmass over the region. A stronger
easterly gradient as the lake aggregate translates east beneath
progressive upper ridging will support highs near 60 west of us-23
and in the mid 50s over the eastern CWA where mixing depths will be
more limited in the lake shadows.

The stretch of dry weather will continue through Tuesday with high
pressure remaining in control at the surface with a split-flow
pattern aloft. Heading into Wednesday, a closed upper low over the
southeast CONUS will open up and merge with incoming northern stream
shortwave energy diving across the northern plains. The long range
guidance diverges significantly in the handling of this interaction,
but enough moisture advecting north across the region will lead to a
period of scattered showers late Tuesday and continuing into
Wednesday night. A secondary closed upper low amidst deepening
longwave troughing over the eastern CONUS will continue to lead to
unsettled weather conditions heading into the weekend.

Temperatures on Monday and Tuesday will be the warmest in quite some
time, with high temperatures reaching well into the 60s. As showers
overspread the region during the midweek period, temperatures will
cool, but still remain in the 50s for daytime highs.

Marine...

high pressure will dominate the region for the next few days. High
will slowly drift eastward, resulting in weakening winds tonight
that will remain light and variable through the weekend. Light
southerly winds will emerge Monday as the high exits to the east.

Unsettled weather likely to return by late Tuesday into Wednesday as
an upper trough pivots through the great lakes.

Dtx watches warnings advisories
Mi... None.

Lake huron... None.

Lake st clair... None.

Michigan waters of lake erie... None.

Aviation... ..Dg
discussion... Jvc irl
marine... ... .Mr
you can obtain your latest national weather service forecasts online
at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTGM4 - 9014098 - Fort Gratiot, MI 4 mi47 min W 2.9 G 4.1 1031.1 hPa (+0.0)
MBRM4 - 9014090 - Mouth of the Black River, MI 6 mi47 min 36°F 1031.1 hPa (+0.0)
PSCM4 28 mi47 min SW 2.9 G 5.1 33°F 1032.2 hPa (-0.0)
AGCM4 30 mi47 min 37°F 1031.2 hPa (-0.0)
CLSM4 - St. Clair Shores, MI 48 mi47 min E 4.1 G 5.1 41°F 1032.2 hPa (+0.7)

Wind History for Fort Gratiot, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St Clair County International Airport, MI13 mi50 minN 010.00 miFair30°F24°F80%1031.8 hPa

Wind History from MTC (wind in knots)
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Last 24hrW6W7NW6W6NW6NW5NW5NW5NW6NW5366N10N7N8NW8
G15
N9NE8NE11E9E7E4Calm
1 day agoN8NW7N7----------NW8N13N13
G20
N13--N16
G25
N18N16
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N13E13E8E824
2 days agoW10W9NW10W8NW9NW5NW5W4W3NW4NW44NW31SE6E5E8NE8NE9E9NE9NE9NE11N11

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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wmap_A
GOES Local Image of GreatLakes    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Detroit/Pontiac, MI (23,6,7,8)
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Ground Weather Radar Station Detroit, MI
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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.