Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Grosse Pointe, 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 6:38AMSunset 8:22PM Saturday April 21, 2018 7:07 PM EDT (23:07 UTC) Moonrise 10:17AMMoonset 12:31AM Illumination 41% Phase: Waxing Crescent; Moon at 7 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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LCZ460 Lake St Clair- 316 Pm Edt Sat Apr 21 2018
Tonight..Light and variable winds. Partly cloudy until early morning then clearing. Waves 2 feet or less.
Sunday..Light and variable winds becoming east 5 to 10 knots in the afternoon. Sunny. Waves 2 feet or less.
Sunday night..East winds 5 to 10 knots. Clear. Waves 2 feet or less.
Monday..Southeast winds 5 to 10 knots. Sunny. Waves 2 feet or less.
Monday night..Southeast winds 5 to 10 knots. Partly cloudy until early morning becoming mostly cloudy. Waves 2 feet or less.
Tuesday..Southeast winds 5 to 10 knots becoming light and variable. Cloudy with a chance of light showers. Waves 2 feet or less.
Wednesday..North winds 10 to 15 knots. Mostly cloudy. A chance of light showers. Waves 2 feet or less.
Thursday..Southwest winds 5 to 10 knots. Partly cloudy. Waves 2 feet or less.
LCZ460 Expires:201804220800;;295154 FZUS63 KDTX 211916 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 316 PM EDT Sat Apr 21 2018 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. .SYNOPSIS...Calm weather conditions will continue this afternoon, as high pressure, 30.50 inches, continues to hold across the Great Lakes region. This high will persist through the end of the weekend before moving eastward away from the region early next week. A weak low, 29.80 inches, then lifts northward mid-week, bringing the next chance for unsettled weather. LCZ460-220800-

7 Day Forecast for Marine Location Near Grosse Pointe, MI
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location: 42.38, -82.9     debug


Area Discussion for - Detroit/Pontiac, MI
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Fxus63 kdtx 212247
afddtx
area forecast discussion
national weather service detroit pontiac mi
647 pm edt Sat apr 21 2018

Aviation
High pressure will maintainVFR CIGS and light winds throughout the
forecast period with just varying degrees of cirrus arcing into the
area from an upper low well southwest of the region. Light variable
winds will become easterly on Sunday as the center of this high
builds over lake huron and southern ontario. Wind speeds will remain
under 10 knots.

Dtw threshold probabilities
* none.

Prev discussion
Issued at 335 pm edt Sat apr 21 2018
discussion...

near term rest of today through tonight
as of 335 pm edt... A dry afternoon continues across southeast
michigan as surface high pressure remains in control. Dewpoints
plummeting into the 20s, and even upper teens across some areas, has
allowed it to feel even drier as rh values dip well below 40 percent.

High clouds spilling northeastward from a closed low parked over the
western plains continue to filter in across most areas, although
gradually thinning out with time and slowly shifting southward with
the peak opacity. A nearly full day of Sun across portions of the
northern thumb into the tri-cities region has allowed these areas to
see the warmest temperatures so far, with bad axe actually coming in
as the hot spot so far peaking at 60 degrees; not too often that the
northern thumb is the warmest spot in southeast michigan on a spring
afternoon. Across the rest of the region, temperatures continue to
warm through the 50s, and will likely reach maxes of mid 50s for most
areas, with upper 50s to around 60 possible north of the i-69
corridor where insolation today has been greatest. Winds will
continue to remain light and variable outside of any lake-enhanced
circulations.

High clouds will continue to slowly wisp away tonight, but may
linger until around midnight close to the ohio border. With high
pressure overhead and light gradient flow, expecting full decoupling
of the boundary layer overnight as winds trend calm in most areas. A
slight increase in the low-level thermal field will act to negate a
full bottoming-out of low temperatures, but excellent radiational
cooling conditions will still allow lows to dip to around the
freezing mark, and below freezing across the thumb.

Short term Sunday through Monday night
departing upper-level jet axis into the mid-atlantic region will
allow for ridging to continue building aloft Sunday, as the western
plains closed low begins to slowly open up and meander southeast in
a quasi rex block pattern. Low amplitude of these features will
limit blocking potential for just about a 24-30 hr period heading
into Sunday night before northern stream energy passing through
manitoba ontario acts to break down the ridging overhead. As Monday
progresses, southeast michigan will be in the pivot point of the
split flow pattern between the closed low drifting over the
tennessee river valley and a secondary piece of pacific shortwave
energy diving southeastward off the northern high plains.

Full daytime heating thanks to bountiful sunshine will allow for
well-mixed and dry boundary layers Sunday and Monday, keeping any
moisture advection trying to lift northward associated with the
closed upper low at bay south of the ohio border. Thermal ridge will
also drift overhead during this timeframe as well, allowing for
continuing moderating temperatures. Highs on Sunday look to reach
into the lower 60s for most locations, with Monday being even warmer
as a southeasterly breeze picks up. Highs on Monday look to reach
well into the 60s, with 70 degree readings possible across inland
areas. Low temperatures Sunday night will fall into the mid and
upper 30s, with only 40s expected for lows Monday night.

Long term Tuesday through Friday
an upper low slowly lifting into the ohio valley on Tuesday will
introduce shower chances to the region as temperatures remain mild
in the upper 50s to lower 60s. A quick-moving northern stream
shortwave diving into the region late Tuesday is then progged to
merge with the ohio valley low early Wednesday before quickly
exiting eastward keeping shower chances in the forecast through at
least the first half of Wednesday. Shortwave ridging will then cross
the region late Wednesday through Thursday bringing a period of dry
conditions ahead of the next northern stream wave progged to dive
southward into the region late next week. Another period of showers
is expected with the second wave along with a shot of colder air
that will bring highs back into the lower 50s.

Marine...

high pressure maintaining its grip on the region through the weekend
resulting in light and variable winds and calm waves across the open
waters of lake huron, lake st. Clair and western lake erie. Look for
light southerly winds on Monday as the surface high pressure drifts
east of michigan. A slow moving mid level low pressure system
meandering across the southern us will lift northward into the great
lakes region late Tuesday into Wednesday. This will bring increasing
chances for precipitation and unsettled weather, which will continue
into the late week as a stronger trough is forecast impact the
region.

Dtx watches warnings advisories
Mi... None.

Lake huron... None.

Lake st clair... None.

Michigan waters of lake erie... None.

Aviation... ..Dg
discussion... Irl jd
marine... ... .Cb
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
CLSM4 - St. Clair Shores, MI 6 mi67 min SE 2.9 G 2.9 46°F 1030.5 hPa (-1.0)
AGCM4 26 mi49 min 48°F 1029.4 hPa
THLO1 - Toledo Light No. 2 OH 41 mi47 min E 2.9 G 2.9 42°F
MBRM4 - 9014090 - Mouth of the Black River, MI 48 mi49 min 56°F 1028.6 hPa

Wind History for Fort Gratiot, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Coleman A Young Municipal Airport, MI7 mi74 minESE 610.00 miFair53°F15°F22%1030.5 hPa
Selfridge Air National Guard Base, MI17 mi71 minSSE 610.00 miMostly Cloudy52°F22°F31%1030.5 hPa
Troy, Oakland/Troy Airport, MI19 mi72 minE 610.00 miFair55°F10°F17%1030.1 hPa
Detroit/Grosse Ile, Grosse Ile Airport, MI24 mi72 minS 510.00 miFair46°F26°F46%1030.1 hPa

Wind History from DET (wind in knots)
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Last 24hrE8SE5E5E4E4E4CalmCalmCalmCalmCalmE3CalmE5SE4E4SE4CalmCalm5SE3SE6SE6SE6
1 day agoE8E6SE3CalmCalmW4W5NW4NW5NW3NW4NW4NW6N6N4Calm----N6SE4S4SE9E8E9
2 days agoE8NE10E8NE15
G22
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NE14N10N9N10--NW8----NW12NW8
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G21
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E12

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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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Detroit/Pontiac, MI (19,4,5,8)
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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.