Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Bay City, 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 6:33AMSunset 8:32PM Wednesday April 25, 2018 10:01 PM EDT (02:01 UTC) Moonrise 2:49PMMoonset 3:42AM Illumination 82% 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
    EDIT      (on/off)   Help
LHZ422 Inner Saginaw Bay Sw Of Point Au Gres To Bay Port Mi- 332 Pm Edt Wed Apr 25 2018
Tonight..Northwest winds 5 to 10 knots. Mostly clear. Waves around 2 feet or less.
Thursday..West winds 5 to 10 knots backing to the southwest in the afternoon. Sunny. Waves around 2 feet or less.
Thursday night..Southwest winds 5 to 10 knots. Mostly clear. Waves around 2 feet or less.
Friday..Northwest winds 5 to 10 knots. Mostly cloudy with a chance of light showers until late afternoon...then partly cloudy late in the afternoon. Waves around 2 feet or less. SEe lake huron open lake forecast for days 3 through 5.
LHZ422 Expires:201804260300;;025057 FZUS53 KDTX 251936 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 332 PM EDT Wed Apr 25 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. LHZ422-260300-

7 Day Forecast for Marine Location Near Bay City, MI
   Hourly   EDIT   Help
location: 43.58, -83.88     debug


Area Discussion for - Detroit/Pontiac, MI
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kdtx 252328
afddtx
area forecast discussion
national weather service detroit pontiac mi
728 pm edt Wed apr 25 2018

Aviation
PeskyVFR stratus sustained under cooler northerly flow will only
gradually diminish in coverage early tonight. Ceilings will continue
to fluctuate within the 4 to 6k ft level, with recent satellite
trends and observational data suggesting MVFR will remain east of
all SE michigan terminals. Gradual low level drying overnight will
then favor a clearing sky, under weak gradient flow. This
environment may provide a brief window for shallow fog development
mid morning 10z-12z . High pressure then settles over the region on
Thursday. This will maintain a dry and stable environment,
supporting clear skies and modest west to southwest winds through
the day.

For dtw... Winds from a northerly direction early tonight,
diminishing in magnitude with time. Occasional pockets of cloud
cover carrying CIGS near 5000 ft will exist through late evening.

Dtw threshold probabilities
* low for ceiling 5000 ft or less early tonight.

Prev discussion
Issued at 321 pm edt Wed apr 25 2018
discussion...

partial clearing across the southern metro region have allowed
temperatures to overachieve this afternoon as temperatures have
climbed into the lower 60s. Northerly flow off of lake huron have
kept temperatures capped in the 40s across the thumb, while more
moderate temperatures have been observed from pontiac up to saginaw,
with highs in the 50s. Communities in the thumb, especially closer
to the shoreline, will have a slight chance to see brief showers
through the evening as a PV anomaly resides across central lake
huron. Cloud cover associated with this eastward moving PV anomaly
and diurnal heating will begin to diminish tonight and overnight as
incoming subsidence and dry air settles in across SE mi. Winds
gusting between 15 - 20 mph, isolated 25 mph, will also quickly
diminish tonight after diurnal mixing ceases after sunset. The cut-
off low and associated PV anomaly will push over new york by
Thursday 12z and will continue to reinforce NW flow across michigan,
allowing 850 mb temperatures to drop to an average of 1c overnight.

Clear skies will allow for strong radiational cooling overnight,
supporting lows in the lower 30s across SE mi and mid-30s across the
urban metro region. A very slight chance for periods of patchy fog
to develop overnight across the thumb, as winds diminish and dry air
moves in aloft, however, opted to leave patchy fog out of the
official forecast as latest high-resolution runs keep surface
conditions too dry to support fog chances.

Otherwise, a ridge of high pressure will then build across michigan
throughout Thursday and will continue to keep conditions dry as
clear to partly clouds skies persist throughout the day. Copious
amount of sunshine will allow temperatures to push into the low to
mid-60s for a daytime high as a weak pressure gradient keep winds
calm to light.

The next chance for rain will enter late Friday morning into the
early afternoon as an upper-level trough and associated cold front
push through the great lakes region. Temperatures will remain below-
normal as a thermal trough and overcast conditions help cap daytime
highs to the mid to upper 50s Friday afternoon. For reference,
normal highs reside in the lower-60s for late april. Otherwise, a
brief lull in precipitation will be possible late Friday afternoon,
before an embedded shortwave located on the backside of a trough
coupled with left exit dynamics from a jet maxima aloft help support
a second round of showers. Rain chances will be centered across the
metro region, late Friday into Saturday morning.

Any lingering showers will be on the way out by Saturday afternoon
as upper jet support and shortwave move off to the east. Strong
ridging through the troposphere will take over in the wake and high
pressure at the surface will dominate the weekend forecast. Thermal
trough with 850 mb temps in the negative single digits c will linger
through Saturday and limit surface highs to the low 50s. Quick
modification of this air mass in late april insolation will allow
Sunday's highs to rise to the mid 50s. Dry and mostly sunny
conditions will prevail Saturday through late Tuesday as the high
pressure slowly drifts south and east. Warm air advection will
become established by Monday with southerly flow bringing highs to
the upper 60s that day, and the lower 70s by midweek. Chance for
rain returns on Wednesday due to low pressure over ontario pushing a
cold front through the great lakes.

Marine...

small craft advisories remain in effect for saginaw bay and southern
lake huron through this evening. Peak gusts topping out near 25
knots will relax through the evening as low pressure tracks east to
southern ontario but the long north fetch will keep waves elevated
in excess of 4 feet for several more hours. High pressure will build
overhead tonight and hold through Thursday resulting in light winds
backing from northwest to southwest. A cold front will then reach
northern lake huron late Thursday night and sweep across the rest of
the basin through the day Friday. This combined with an additional
low pressure system sweeping across the southern lakes will keep
unsettled conditions and gusty northerly flow through the weekend.

Dtx watches warnings advisories
Mi... None.

Lake huron... Small craft advisory until 10 pm edt this evening for lhz421-
441>443.

Lake st clair... None.

Michigan waters of lake erie... None.

Aviation... ..Bt
discussion... Am tf
marine... ... .Dk
you can obtain your latest national weather service forecasts online
at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SBLM4 - Saginaw Bay Light #1, MI 18 mi61 min ENE 6 G 7 43°F 1014.6 hPa (-0.3)
GSLM4 - Gravelly Shoals Light MI 35 mi81 min NE 5.1 G 6 42°F 1015.9 hPa
TAWM4 - Tawas City, MI 52 mi81 min NW 1.9 G 4.1 42°F 1014.6 hPa

Wind History for Harbor Beach, MI
(wind in knots)    EDIT      (on/off)   Help
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last
24hr
E7
E6
E4
E1
E2
N3
N8
N11
G14
N17
G22
NW12
G16
NW12
G18
NW13
G17
N20
N19
G23
N18
G24
NW16
G21
N18
G23
N21
G26
N20
G25
NW20
NW20
NW15
G22
NW11
G17
NW9
G13
1 day
ago
--
SE1
S2
S8
S6
SW7
SW3
S3
SW2
S3
G7
SE6
S4
SE7
SE8
SE6
SE9
SE5
NE4
E3
SE6
E2
E1
SE5
E3
2 days
ago
NE4
NE3
G6
NE5
N2
N3
SW2
G7
SE4
E2
NE1
NE1
N4
N5
NE3
E2
NE3
NE3
NE4
NE4
NE4
N5
N5
N6
N3
N5

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Saginaw County H W Browne Airport, MI10 mi66 minNE 510.00 miOvercast43°F35°F76%1015.2 hPa
MBS International Airport, MI11 mi68 minENE 610.00 miOvercast45°F37°F74%1015.7 hPa
Jack Barstow Airport, MI21 mi66 minNNW 510.00 miOvercast46°F34°F64%1015.2 hPa

Wind History from HYX (wind in knots)
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last 24hrCalmE5CalmN3N3N6N9
G14
N7NW13
G17
N5N9NW10N9N10
G15
NE8NE9NE12NE11N11
G17
NE13NE10N9NE10NE4
1 day agoCalmCalmCalmS4S4SW7SW5CalmSE3SE4SE5SE5S6S3CalmCalmN3NE9N9N7N9N9N5Calm
2 days agoCalmE4CalmE3CalmCalmN3N5NE4N4N4NE5NE8N8NE5N9N11N11N11N10N8N6N5N3

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (22,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Detroit, MI
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.