Sunday, September23, 2018 L-36.com


Marine Weather and Tides
Port Huron, MI

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9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 7:17AMSunset 7:25PM Sunday September 23, 2018 10:18 PM EDT (02:18 UTC) Moonrise 6:09PMMoonset 4:33AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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- 924 Pm Edt Sun Sep 23 2018
.small craft advisory in effect from 2 am edt Monday through Tuesday morning...
Rest of tonight..East winds 10 to 15 knots increasing to 15 to 20 knots early in the morning. Clear. Waves 1 to 3 feet building to 2 to 4 feet early in the morning.
Monday..Southeast winds 15 to 20 knots. Partly cloudy until late afternoon...then mostly cloudy with a slight chance of light showers late in the afternoon. Waves 2 to 4 feet.
Monday night..South winds 15 to 20 knots. Cloudy with light showers likely and a chance of Thunderstorms. Waves 3 to 5 feet. Waves occasionally around 7 feet.
Tuesday..South winds 15 to 20 knots diminishing to 10 to 15 knots in the late morning and afternoon. Mostly cloudy. Showers likely and a chance of Thunderstorms early in the morning...then a chance of showers and Thunderstorms in the late morning and afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late morning and afternoon. SEe lake huron open lake forecast for days 3 through 5.
LHZ443 Expires:201809240900;;111579 FZUS53 KDTX 240132 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 924 PM EDT Sun Sep 23 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. LHZ443-240900-


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 232328
afddtx
area forecast discussion
national weather service detroit pontiac mi
728 pm edt Sun sep 23 2018

Aviation
Low level dry air and midlevel anticyclonic flow will keep
conditions quiet throughout the overnight. There remains some
potential for very shallow ground based radiation fog around
sunrise, but light easterly gradient flow will be slightly more
prevalent. A substantial amount of low level moisture advection will
then ramp up on Monday as flow turns southerly ahead of the
approaching plains trough. Model soundings show a significant amount
of low level saturation developing during the midday period for all
of the southern TAF sites. Generally, went slightly slower with
onset timing of MVFR cig heights and hydrometeors timing. Given the
lack of midlevel saturation in the soundings, preference was to just
carry a prevailing mention of -dz during the afternoon. Best
potential for light rainfall may remain near the detroit river and
lake st clair area through 00z Tuesday evening. Plenty of time
remains to iron this out.

Dtw threshold probabilities
* high for cigs AOB 5kft after 15z Monday.

Prev discussion
Issued at 353 pm edt Sun sep 23 2018
discussion...

a "chamber of commerce" day is unfolding for the first full day of
autumn around SE michigan thanks to high pressure in control. Full
sun with light and variable wind and neutral low level thermal
advection allowed afternoon temperatures to reach normal values in
the upper 60s and lower 70s and sets the stage for a typical late
september night. The surface high shrinks eastward and the cold
front dissipates over the northern great lakes tonight as these
features give way to low pressure organizing over the northern
plains and upper midwest. This process sharpens the surface pressure
gradient over lower michigan enough to maintain an easterly wind in
the 5 to 10 knot range that likely holds up against nocturnal
decoupling and prevents temperatures from reaching full radiational
cooling potential across SE michigan. Guidance min temps in the
upper 40s to lower 50s - upper 50s metro detroit - look good across
the board.

Changes then get underway in our area during Monday mainly due to
backing flow aloft and strengthening southerly low level flow ahead
of the upper level trough over the plains. This process sets off a
northward return of moisture from the sharp frontal zone stalled
across the tennessee valley along with a northward move of the upper
wave shearing out of the lower mississippi valley. The broad frontal
system over the plains and upper midwest carries strong 850-700 mb
theta-e advection northward into lower michigan during Monday
afternoon. This results in scattered high based showers increasing
coverage toward evening as the southern stream wave shears toward
the ohio border and adds a dynamic component of lift to the strong
moisture transport. The new round of 12z model data hints at the
bulk of the added short wave influence occuring south of the i-69
corridor with a slight eastward shift in the QPF axis. Coverage and
intensity may then start out lower toward the tri cities Monday
evening before a secondary surge of moisture transport occurs during
the night, originating over the western great lakes and increasing
coverage areawide through the night. The moisture surge occurs as
the southern stream upper wave exits east of lake erie and the
midwest upper trough and frontal system move closer to the western
great lakes. Low level jet enhancement then fuels nocturnal
expansion of showers over lower michigan with a few thunderstorms
possible in weak elevated instability.

The Monday night rain pattern ushers the warm sector air mass into
se michigan by Tuesday morning ahead of the cold front extending
across the western great lakes. Convective trends become the
forecast focus and the subject of the current day 3 slight risk
outlook. At this time range, the 3km NAM is the only high res run
offering output for Tuesday afternoon. It shows a quick recovery of
surface based instability after a wet and cloudy start to the day
for late afternoon convective initiation within a prefrontal trough.

Both high res and synoptic scale model consensus of MLCAPE around
1500 j kg combined with a strong wind field, anchored by 50 knots at
500 mb, does support organized thunderstorms but strongly dependent
on that projected CAPE actually materializes. The cold front itself
then sweeps through with a shower pattern mostly within the mid
levels and trailing the surface front for the rest of Tuesday night.

Showers and thunderstorms chances will continue along an approaching
cold front, however, long-range models diverge regarding the timing
of the front. The gem and ECMWF are the quickest of the group,
pushing the front through during the Wed 06 - 12z timeframe. The gfs
is slower with the passage of the front, bringing the front through
between Wed 12 - 18z. Timing of the front will have implications
regarding the end time of rain and thunderstorm chances. Left in the
chance for rain throughout Wednesday morning in the forecast to
account for the possibility of a slower moving cold front.

The introduction of cooler air and zonal flow aloft will bring an
extended period of slightly below normal temperatures for the
remainder of the forecasting period. Daytime highs are expected to
stay below the 70 mark, peaking in the low 60s north of i-69 up to
the upper 60s souther of i-96. Overnight lows in the 40s are
expected during this timeframe, with warmer lows in the lower 50s
across the urban metro area. Lack of meaningful forcing will keep
conditions relatively dry as an area of higher pressure holds across
the eastern u.S.

The next chance for rain will move in Saturday into Sunday as a
potential baroclinic zone sets up across southern michigan. The
ecmwf run sets up an overrunning scenario across a stationary front
as the main cause of rain chances over the weekend, however, the gfs
and gem are more aggressive with increasing theta-e advection
through the same timeframe, which would also provide rain chances to
the area.

Marine...

fresh easterly flow will gradually veer to southeasterly through
Monday. Onshore flow will build significant wave heights to several
feet during this time. Small craft advisories therefore remain in
effect. By Monday night... The long-duration southeast wind will
build maximum wave heights into the 10 to 15 foot range over much of
central lake huron. Wind will then diminish on Tuesday as low
pressure moves over the waters. However, moderate to fresh northwest
flow will quickly redevelop on Wednesday as a large canadian high
builds from the west.

Hydrology...

numerous showers are expected Monday evening and Monday night as a
warm front lifts into the state. Rainfall totals of one quarter to
one half-inch are anticipated. No flooding is expected.

Dtx watches warnings advisories
Mi... None.

Lake huron... Small craft advisory from 2 am Monday to 10 am edt Tuesday for
lhz441>443.

Small craft advisory from 2 am Monday to 4 am edt Tuesday for
lhz421.

Lake st clair... None.

Michigan waters of lake erie... None.

Aviation... ..Cb
discussion... Bt am
marine... ... .Jvc
hydrology... .Jvc
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 mi30 min 62°F 1023.9 hPa54°F
MBRM4 - 9014090 - Mouth of the Black River, MI 6 mi30 min 62°F 1023.8 hPa
PSCM4 28 mi18 min NE 17 G 19 62°F 1024.7 hPa (+1.0)
AGCM4 30 mi30 min 58°F 67°F1023.7 hPa
45149 - Southern Lake Huron 38 mi78 min NE 16 G 19 62°F 66°F2 ft1024 hPa (+0.7)
45147 - Lake St Clair 46 mi18 min NE 9.7 G 12 64°F 68°F1 ft1022.9 hPa (+1.1)
CLSM4 - St. Clair Shores, MI 48 mi18 min ENE 15 G 17 63°F 1023.7 hPa (+1.0)

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 mi23 minN 010.00 miFair54°F50°F88%1024.4 hPa

Wind History from PHN (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE6E5E6SE3N4NE6NE7NE5N3CalmN4
1 day agoW5NW8
G14
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N4NW5NW5NW6NW7NW5N7N4NE5NE6E3NE6NE5NE5CalmCalmCalmCalm
2 days agoSE4SE4SE3S4S5S7S9S9S11
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Tide / Current Tables for
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Weather Map and Satellite Images
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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 (22,6,7,8)
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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.