Tuesday, December18, 2018 L-36.com


Marine Weather and Tides
Grosse Pointe, MI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:54AMSunset 5:02PM Tuesday December 18, 2018 1:50 PM EST (18:50 UTC) Moonrise 2:31PMMoonset 3:02AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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- 958 Pm Est Mon Dec 17 2018
Rest of tonight..Northwest winds 10 to 15 knots diminishing to 5 to 10 knots early in the morning. Partly cloudy. Waves 2 feet or less.
Tuesday..Northwest winds 5 to 10 knots early in the morning becoming light and variable...then becoming southwest 5 to 10 knots late in the afternoon. Mostly Sunny. Waves 2 feet or less.
Tuesday night..South winds 5 to 10 knots. Mostly clear. Waves 2 feet or less.
Wednesday..Southwest winds 10 to 15 knots becoming south 5 to 10 knots late in the afternoon. Mostly Sunny. Waves 2 feet or less.
Wednesday night..South winds 5 to 10 knots. Partly cloudy until early morning becoming mostly cloudy. Waves 2 feet or less.
Thursday..South winds 5 to 10 knots becoming light and variable. Mostly cloudy. Rain likely early in the evening. Rain and snow likely late in the evening. Waves 2 feet or less.
Friday..Northwest winds 15 to 20 knots. Rain and snow. Waves 2 feet or less.
Saturday..West winds 15 to 20 knots. Mostly cloudy. Waves 2 feet or less.
LCZ460 Expires:201812180915;;957391 FZUS63 KDTX 180258 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 958 PM EST Mon Dec 17 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...High pressure, 30.40 inches, will expand into the western Great Lakes this evening and tonight. This high will move across Lower Michigan Tuesday before advancing to the east coast by Wednesday. LCZ460-180915-


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 181733
afddtx
area forecast discussion
national weather service detroit pontiac mi
1233 pm est Tue dec 18 2018

Aviation
Vfr conditions will carry us the TAF cycle with high pressure
remaining in control over the region. The center of the high has
drifted just southeast of the area which has opened the door for
weak southerly flow which will persist through Wednesday. The last
of the low stratus localized over saginaw valley will scour out over
the next hour or so leaving mostly clear skies with only some
passing cirrus.

Dtw threshold probabilities
* none.

Prev discussion
Issued at 319 am est Tue dec 18 2018
discussion...

water vapor imagery over the continent reveals relatively little
change since yesterday. Active subtropical jet streaming across the
baja peninsula is substantially aiding the process of a new upper
low cutting off near the mexican border while a strong east pacific
jet funnels into the pacific northwest. In fact, some lead jet
energy is already noted feeding into this developing southern stream
low, a sign of things to come over the next 48 hours as the bulk of
upstream jet energy reaches the CONUS and further amplifies the
pattern. Locally, flow remains in in a quasi-split flow state which
will ensure a progressive pattern through mid-week as ridging
rapidly works through the great lakes.

As of this morning, deep layer subsidence and surface high pressure
is supporting clear skies over the western great lakes and southwest
half of the lower peninsula while stratus remains locked beneath
the inversion roughly along and northeast of a saginaw-pontiac-
detroit. These clouds will easily hold firm for the remainder of the
night before eroding from SW to NE as anticyclonic flow deepens and
the progressive pattern simply shunts the moisture plume off to the
east through the morning. Warm advection working downward through
the column will be highly ineffective at warming temperatures today.

In fact, the thermal trough at 925mb will be several degrees colder
at 12z this morning than 24 hours ago even though warm advection at
850mb already commenced a few hours ago. Given the expectation for
similar stratus coverage as yesterday to begin today, the general
expectation is for temperatures to fall short of yesterday's highs
over the mostly sunny zones mainly west of i-75 and at least match
in the thumb where clouds will clear by this afternoon.

Return flow around departing high pressure will commence tonight,
helping maintain elevated lows in the mid and upper 20s, especially
in the saginaw valley. With warm advection in full swing,
temperatures Wednesday and Thursday will be mild, at least low to
mid 40s, under gradually increasing mid and high clouds.

Friday is still the day of interest, if there is one, in the
forecast period as the next 48 hours will feature the aforementioned
pacific jet energy capitalizing on the already-deepening pv
reservoir over southwest texas. Extremely amplified trough, the
southern periphery of which will penetrate well into central
america, will support a significant cyclone that will translate
northeastward over the eastern third of the us late Thursday through
Friday. Initially cut off from warm air due to the system origins in
the stj, any locations impacted by the deformation zone are almost
certain to see mostly rain before ending as snow as cold air
gradually infiltrates. Although a high degree of uncertainty will
accompany this system due to the low-latitude positioning of the
energy, it would take a substantial modeling error of the mid-
latitude westerlies before snow became a concern. At this time, hard
to envision anything more than an inch or so Friday evening.

Marine...

winds and waves will continue to diminish this morning into early
afternoon as high pressure traverses lower michigan and lake huron.

This high will drift east of the region late tonight into Wednesday
morning. The result will be an increasing southwest gradient. Low
level warm air advection within the southwest winds will limit the
over-lake stability, thus keeping wind gusts at or below 25 knots. A
slow moving frontal boundary will approach the region Thursday,
resulting in a weakening gradient across the great lakes. This will
support a decrease in the winds and waves during the course of the
day Thursday.

Dtx watches warnings advisories
Mi... None.

Lake huron... None.

Lake st clair... None.

Michigan waters of lake erie... None.

Aviation... ..Drk
discussion... Jvc
marine... ... .Sc
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 mi50 min Calm G 6 33°F 1024 hPa (-2.1)
AGCM4 26 mi50 min 37°F 39°F1023.1 hPa (-1.7)
THLO1 - Toledo Light No. 2 OH 41 mi110 min S 4.1 G 6 34°F
MBRM4 - 9014090 - Mouth of the Black River, MI 48 mi50 min 36°F 1022.6 hPa (-1.5)

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 mi57 minSSW 610.00 miFair34°F21°F59%1024.5 hPa
Selfridge Air National Guard Base, MI17 mi54 minS 410.00 miA Few Clouds36°F23°F59%1024.5 hPa
Troy, Oakland/Troy Airport, MI19 mi55 minSW 810.00 miFair35°F19°F53%1024 hPa
Detroit/Grosse Ile, Grosse Ile Airport, MI24 mi55 minS 710.00 miFair33°F23°F67%1023.7 hPa

Wind History from DET (wind in knots)
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Last 24hrNW6NW5NW10NW8NW6NW5NW7CalmNW3CalmN4N6N4NE8NE5N6E5NE5CalmCalm34SW6SW6
1 day agoW7W6W5W6W4W8W7W6W5W7W7W7W5W8W8W6W6W7W5W5NW6NW9NW9NW7
2 days agoNE8NE7NE9NE8NE7N7N8NE8NE7NE7NE5NE5NE5N6N3N5N6N6N5NE5N4CalmS3SW4

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    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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Wind Forecast for Detroit/Pontiac, MI (13,3,4,5)
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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.