Marine Weather and Tides
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
|Sunrise 5:57AM||Sunset 9:08PM||Saturday May 27, 2017 7:51 AM EDT (11:51 UTC)||Moonrise 6:55AM||Moonset 10:09PM||Illumination 4%|
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|LHZ421 Outer Saginaw Bay Sw Of Alabaster To Port Austin Mi To Inner Saginaw Bay- 412 Am Edt Sat May 27 2017 |
Today..Light and variable winds becoming east 5 to 10 knots in the late morning and afternoon. Partly cloudy in the morning becoming mostly Sunny. Waves around 2 feet or less.
Tonight..East winds 5 to 10 knots becoming southeast 10 to 15 knots late in the evening...then diminishing to 5 to 10 knots after midnight. Partly cloudy. Waves around 2 feet or less.
Sunday..Southeast winds 5 to 10 knots becoming east 10 to 15 knots in the afternoon. Partly cloudy early in the morning becoming mostly cloudy. Light showers and Thunderstorms likely in the afternoon. Waves around 2 feet or less.
Sunday night..East winds 10 to 15 knots veering to the west in the late evening and overnight. Mostly cloudy with showers and Thunderstorms likely early in the evening...then mostly cloudy with showers likely in the late evening and early morning. Partly cloudy early in the morning. Waves 1 to 3 feet. SEe lake huron open lake forecast for days 3 through 5.
|LHZ421 Expires:201705271500;;275018 FZUS53 KDTX 270820 NSHDTX NEARSHORE MARINE FORECAST FOR MICHIGAN NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 412 AM EDT SAT MAY 27 2017 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. LHZ421-271500-|
7 Day Forecast for Marine Location Near Caseville, MIHourly EDIT Help
Area Discussion for - Detroit/Pontiac, MI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus63 kdtx 270930|
area forecast discussion
national weather service detroit pontiac mi
530 am edt Sat may 27 2017
Any br or low clouds this morning will dissipate quickly after
sunrise. Diurnal heating will then allow a diurnal CU field to
develop this afternoon as a shallow layer of moisture remains under
an inversion. There is some uncertainty as to whether there is
enough moisture for a bkn coverage, however. Bases are expected to
remain below 5000 feet. Winds today will remain light out of the
east, generally under 6 knots.
Dtw threshold probabilities...
* low for cigs AOB 5kft from 15z-01z Saturday.
Showers and thunderstorms are likely Sunday, mainly during the
afternoon and evening as low pressure lifts across the area. Basin
average rainfall amounts are forecast to range between one-quarter
and one-half inch, but precipitation totals will vary widely from
location to location due to the hit and miss nature of showers and
thunderstorms. Storms could be on the strong to severe side,
producing very heavy rainfall which could cause ponding of water on
roads and in poor drainage areas.
Issued at 418 am edt Sat may 27 2017
holiday weekend - forecast package highlights.
1. Outstanding weather today. A good amount of sunshine with
temperatures warming into the middle to upper 70s. Cooler near the
lake huron shoreline.
2. Increasing confidence in numerous to widespread thunderstorm
activity on Sunday. The potential will exist for large hail and
damaging wind gusts. The potential will also exist for tornado
development. Uncertainty in timing remains, however, latest trends
have supported greatest potential for the thunderstorms will be in
the 5 pm to 11 pm ldt window.
Confidence is also increasing in quiet, very little precipitation
activity Sunday morning through the noon hour.
3. Cooler conditions, in the lower 70s Monday. Scattered showers
with some thunderstorms developing during the afternoon,
particularly north of the m 59 and I 69 corridors. No severe weather
Today. The northern edge of the persistent MCS has been evaporating
while quickly stripping out of southeastern michigan. Could see a
sprinkle or two before daybreak, otherwise, the precipitation has
largely ended. Model data continues to suggest enough near surface
moisture exists to support some fog, particularly in the thumb down
through the central part of the cwa. Haven't really seen much in
surface observations to this point, but decided to include a patchy
fog mention through daybreak.
Really a good anticyclone signal today throughout the depth of the
troposphere. Models show a dominant shortwave ridge at 300mb with
good continuity for a compact and localized anticyclonic vorticity
bubble tracking right through the cwa. Additionally, there is a
decent lake aggregate ridge response. Satellite trends this morning
do nothing to dispel the idea that a good amount of sunshine will be
observed. Undoubtedly, there will be a cumulus response, but models
soundings are lean on lapse rates and the look is more of a flat
convective depth. This should set up a great day with temperatures
for a majority of the area rising into the middle to upper 70s.
Warmest temperatures appears set for the tri cities region.
Sunday. An interesting setup. Models are largely in agreement that a
number of features at the synoptic scale will come together over
southeastern michigan to support a severe weather risk. The most
dominant of the features will be the larger wavelength, canadian pv
anomaly that will dig into the far western great lakes basin. While
this is occurring, the southern branch to the upper level jet is
shown to merge with the PV anomaly. The combination of left exit
region dynamics from the speed maximum aloft with the apex of a very
well developed low to midlevel theta E ridge will result in a triple|
point or surface low center lifting northeastward though lower
michigan. Forecast timing has the surface low by the tri cities by
A warm front will reside immediately along the forward flank of the
theta E ridge, connected to the surface low triple point. The warm
front is forecasted to lift northward from the detroit metro at
approximately 20z up into the thumb by 00z. Given the limitations of
nwp, it is always difficult to say with absolute certainty what
surface dewpoints will be in an advection event. Looking at plan
view data along with forecast soundings, a safe expectation is for
surface dewpoints to eclipse the 60 degree mark and into the low 60s
during the afternoon. Without question the big negative for this
setup will be poor midlevel lapse rates. In fact, there is a pretty
formidable subsidence inversion progged early in the 5.0 to 10.0 kft
agl layer. Thinking at this time is that 1000 j kg of MLCAPE will
develop with perhaps as much as 1500 j kg possible if localized
pooling of moisture can occur along the warm front. In addition to
the instability, data suggests a good amount of shear will exist in
the warm frontal region with 35 to 40 knots of 0-6 km bulk shear and
25 knots of 0-0.5km bulk shear. Therefore, it is expected that
supercells are the most likely of storm mode. A frontal wave
response related to the midlevel theta E ridge lifting into lower
michigan will support the development of showers and thunderstorms.
The potential will exist for severe weather across all of
southeastern michigan. The best of the potential will exist along
and immediately on the cool side of the warm front. The severe
weather threats will be damaging wind gusts to 60 mph with mature
storms and downdraft development, some large hail to 1 inch. Backed
southeasterly surface flow ahead of the warm front which will result
in near surface directional shear, resulting in the potential for
The failure mechanism for severe weather development Sunday will be
if a combination of clouds and poor midlevel lapse rates will
significantly limit instability. Given the combination of late
afternoon timing, a climatologically favored period in late may, and
directional shear along a warm front, the decision was made to err
more aggressive on messaging for a potential severe weather event.
Monday... The upper level low will push down directly into the
central great lakes. A double barrel, merged, upper level jet
configuration should act in negating the southern push of the cold
front. With some breaks in clouds across the southern forecast area
temperatures will again climb above 70 degrees. However, the most
noticeable aspect of the forecast will be much cooler dewpoints.
Clouds will also push down across all of the area during the
afternoon. Some question about who exactly will see scattered
showers with possible thunderstorms during the afternoon. The nwp
data wants to limit the precipitation chances to the north of m59
and i69 corridors. However, not into splitting hairs at the moment
and want to keep a chance in for all areas. No severe weather risk
fairly light winds are expected over the region today as high
pressure builds back over the great lakes. Winds will stay
moderately light Sunday as low pressure lifts through the area, but
showers and thunderstorms will become likely across all of the
central great lakes. Some of these storms may become severe. Winds
will turns southwesterly behind a cold front by late Sunday evening,
then strengthen Monday through Tuesday as low pressure stalls over
ontario. Small craft advisories may be needed, especially over
Dtx watches warnings advisories
Lake huron... None.
Lake st clair... None.
Michigan waters of lake erie... None.
marine... ... .Hlo
you can obtain your latest national weather service forecasts online
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|GSLM4 - Gravelly Shoals Light MI||19 mi||49 min||NE 5.1 G 8.9||54°F||1013.2 hPa|
|KP58||20 mi||60 min||SE 5.1||51°F||1012.2 hPa||49°F|
|TAWM4 - Tawas City, MI||21 mi||71 min||ENE 4.1 G 6||50°F||1012.5 hPa|
|45163||23 mi||31 min||NE 5.8 G 5.8||57°F||58°F|
|HRBM4 - 9075014 - Harbor Beach, MI||31 mi||51 min||SSE 5.1 G 6||47°F||1012.4 hPa (+0.7)||47°F|
|SBLM4 - Saginaw Bay Light #1, MI||33 mi||51 min||S 5.1 G 7||60°F||1011.9 hPa (+0.7)|
|45008 - S HURON 43NM East of Oscoda, MI||44 mi||121 min||SSE 3.9 G 3.9||40°F||41°F||1013.2 hPa (+0.0)|
Wind History for Harbor Beach, MI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Bad Axe, Huron County Memorial Airport, MI||19 mi||54 min||N 0||2.50 mi||Fog/Mist||51°F||50°F||100%||1012.9 hPa|
|Port Hope, MI||20 mi||60 min||SE 5||mi||51°F||48°F||92%||1012.2 hPa|
Wind History from BAX (wind in knots)
|1 day ago||NE||NE||NE||NE||NE||E||Calm||E||NE||NE||NE||NE||NE||NE||NW||N||NW||NW||NW||N||NW||NW||NW||N|
|2 days ago||NE||E||NE||NE||NE||NE||NE||NE||NE||NE||NE||NE||NE||Calm||NE||NE||NE||NE||NE |
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Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of GreatLakes EDIT
Wind Forecast for Detroit/Pontiac, MI (7,2,3,4)(on/off)  Help
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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.