Friday, March24, 2017 L-36.com


Marine Weather and Tides
Harper Woods, MI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:25AMSunset 7:51PM Friday March 24, 2017 7:55 PM EDT (23:55 UTC) Moonrise 4:33AMMoonset 3:09PM Illumination 7% Phase: Waning Crescent; Moon at 27 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- 942 Am Edt Fri Mar 24 2017
Rest of today..Southwest winds 10 to 15 knots. Partly Sunny. Waves 2 feet or less.
Tonight..Southwest winds 10 to 15 knots becoming north 5 to 10 knots in the late evening and overnight. Mostly cloudy. A chance of light rain after midnight. Waves 2 feet or less.
Saturday..North winds 5 to 10 knots becoming east 10 to 15 knots in the late morning and afternoon. A chance of light rain early in the morning...then rain in the late morning and afternoon. Waves 2 feet or less.
Saturday night..East winds 10 to 15 knots. Cloudy. Light rain likely until early morning...then a chance of light rain early in the morning. Waves 2 feet or less.
Sunday..Southeast winds 10 to 15 knots becoming south 5 to 10 knots in the evening. Light rain and a chance of Thunderstorms... Then light rain likely late in the evening. Waves 2 feet or less.
Monday..South winds 5 to 10 knots. Mostly cloudy with light rain likely. Waves 2 feet or less.
Tuesday..North winds 10 to 15 knots. Mostly cloudy with rain likely. Waves 2 feet or less.
LCZ460 Expires:201703242000;;005520 FZUS63 KDTX 241345 RRA GLFSC LAKE ST CLAIR FORECAST NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 942 AM EDT FRI MAR 24 2017 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...A LOW PRESSURE SYSTEM OVER THE CENTRAL PLAINS...AVERAGING 29.60 INCHES...WILL LIFT A WARM FRONT THROUGH SOUTHERN LOWER MICHIGAN THIS MORNING. THIS FRONT WILL STALL ACROSS THE CENTRAL GREAT LAKES TODAY AND REMAIN THERE THROUGH MOST OF THE WEEKEND. LCZ460-242000-

7 Day Forecast for Marine Location Near Harper Woods, MI
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location: 42.42, -82.99     debug


Area Discussion for - Detroit/Pontiac, MI
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Fxus63 kdtx 241953
afddtx
area forecast discussion
national weather service detroit/pontiac mi
353 pm edt Fri mar 24 2017

Discussion
Upper low centered over northern texas and oklahoma will slowly
track east through the plains tonight and Saturday, before beginning
to lift northward towards the great lakes. The frontal boundary
currently draped over central lower michigan will sink slowly
southward tonight as high pressure builds through ontario and
quebec. Main area of precipitation now over northern michigan and
wisconsin will settle southward as well, filling in some as the
convergence along the front tightens in response to right entrance
region forcing from a jet streak passing through the northern great
lakes and eastern canada. The fgen forcing should provide a fairly
steady rainfall along elevated portions of the frontal boundary
tonight into Saturday, before the jet streak slides east. Main area
of rainfall will sink into the northern portion of the forecast area
this evening and tonight. Another area of rainfall is looking to
develop this evening further south, however, and should affect the
detroit area.

Forecast models, including all higher-res runs, continue to develop
another area of showers ahead of the surface front this evening, as
it reaches roughly near the m-59 corridor southward. The increase in
activity looks to be in response to low-level convergence increasing
as the front encounters strong southerly flow, and as a modest theta-
e surge makes its way up into michigan from illinois/indiana.

Stability indices continue to hint that thunder may be a possibility,
but forecast soundings show enough of a cap to justify leaving the
mention of thunder out. Rain should then fill in over all of
southeast michigan by early Saturday morning as the elevated portion
of the front slides solidly over the area. High coverage/more steady
rain should continue through about mid-day before it likely tapers
to showers as upper jet support is lost. Showers will then continue
through Saturday night and Sunday as the upper low lifts northward
and pushes the front back northward into the area. Activity on
Sunday should be more convective in nature, with a few thunderstorms
even possible, as the upper low and associated cold pool work
across.

Clearing and mixing into very warm air aloft has pushed temperatures
into the upper 60s to low 70s this afternoon on the south side of
the warm front. Temperatures tonight will show wide variation as the
front slowly slides through the area, dropping into the mid 30s for
the northern portion of the area and the upper 40s near the ohio
border. Not much temperature recovery is expected during the day
tomorrow as southeast michigan remains on the north side of the
surface front, under clouds and rain, and we see stiff east to
northeast winds off the colder lake waters (especially lake huron).

A slight chance for spotty showers will exist throughout Monday as
southwest winds continue to advect warm, moist air into the region.

Pop values will steadily increase Monday night into Tuesday morning
as low pressure pushes from missouri, into the ohio valley. The
chance for rain will gradually diminish throughout the day on
Tuesday as high pressure moves in from the northern central plains
into the great lakes region late Tuesday into Thursday morning,
keeping conditions relatively dry through that period.

The next chance for precipitation will return Thursday into Friday,
as the gem and ECMWF 12z suites pick up on low pressure moving from
texas/oklahoma into michigan. High uncertainty still exists
regarding both the timing, track, and strength of the potential low.

For comparison, the GFS long-range run keeps the system well to the
south of michigan, centering it across kentucky Friday night and
into west virginia by Saturday morning. This feature will be
something to keep an eye on as we approach next week.

Marine
Frontal boundary over central lake huron his afternoon will sink
south tonight as high pressure builds into ontario, leading to
northeast winds of 15 to 25 knots over lake huron tomorrow with
gusts briefly up to 30 knots over the mid section of the lake early
tomorrow morning. This will lead to waves in excess of 4 feet
impacting the nearshore waters over the northern thumb region during
the day, and small craft advisories have been issued. Winds will
become a bit more east-southeast for the second half of the weekend
as low pressure tracks through the western ohio valley and into
lower michigan Sunday night. The weak low then looks to slowly pass
through lake huron on Monday, with generally light winds right into
Tuesday, but from the north behind the low.

Hydrology
Periods of showers tonight and right through the weekend as a
frontal boundary meanders over southern lower michigan. Rainfall
totals are expected to approach 1 inch across much of the area, but
flooding is not expected due to the long duration and intermittent
nature of the rainfall. Runoff from the rainfall will increase flow
rates and water levels in local streams and rivers.

Prev discussion
Issued at 113 pm edt Fri mar 24 2017
aviation...

just mid clouds around early this afternoon as majority of southeast
michigan resides solidly in the warm sector, promoting strong
southwest wind gusts of 25 to 30 knots across southern TAF sites.

The frontal boundary over northern lower michigan will be on the move
to the south by early this evening, helped out by sunset and the
cold flow off lake huron.

Modest surface based instability has built up toward the ohio border
this afternoon, and there is a very low risk of a thunderstorm early
this evening as front drops south.

Low clouds should easily develop and lower this evening/tonight as
low level front produces showers, and expected to reach ifr
conditions, with likely lifr conditions at all TAF sites late
tonight, with little to no improvement Saturday morning as the front
remains stalled and showers and drizzle persists.

For dtw... Southwest winds near 20 knots sustained, gusting to 30+
knots early this afternoon will subside toward sunset, becoming
light during the evening hours, with wind shift to the northeast
occuring by midnight. Easterly winds (around 10 knots) then look to
prevail overnight into Saturday. High confidence in borderline
ifr/lifr conditions developing tonight, and moderate for lifr
conditations.

//dtw threshold probabilities...

* high for cigs AOB 5000 ft after 00z this evening.

* low confidence in cigs/vsby AOB 200 ft or 1/2sm late tonight into
early Saturday morning.

* high guidance in southwest gusts exceeding 25 knots this afternoon.

* very low risk of a thunderstorm early this evening

Dtx watches/warnings/advisories
Mi... None.

Lake huron... Small craft advisory from 6 am to 8 pm edt Saturday for lhz422.

Small craft advisory from 6 am Saturday to 4 am edt Sunday for
lhz421-441.

Lake st clair... None.

Michigan waters of lake erie... None.

Discussion... Hlo/am
marine... ... .Sf
hydrology... .Sf
aviation... ..Sf
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 7 mi55 min SSW 8 G 13 72°F 1013.5 hPa (-0.0)
AGCM4 28 mi37 min 50°F 1014.3 hPa
THLO1 - Toledo Light No. 2 OH 42 mi55 min SW 18 G 19 60°F
MBRM4 - 9014090 - Mouth of the Black River, MI 49 mi37 min 1015.8 hPa

Wind History for Fort Gratiot, MI
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Last
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S12
G15
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G17
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G19
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G16
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G19
S10
G13
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G15
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G19
SW11
G20
SW9
G14
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G14
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G14
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G16
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G18
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G22
SW13
G19
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G16
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G18
W7
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N24
NE18
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1 day
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NE8
E5
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G7
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G9
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G5
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G12
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G17
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G17
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NW15
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G23
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G21
NW14
G25
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NW18
G25
NW13
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G17
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G23
NE26
G32
NE25
G31
NE29
NE22
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G24
NE16
G21
NE13
G17
NE13
G16
NE14
G18
NE13
NE12
NE9

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Detroit, Detroit City Airport, MI2 mi62 minSW 810.00 miMostly Cloudy73°F55°F53%1013.1 hPa
Troy, Oakland/Troy Airport, MI13 mi61 minSW 610.00 miPartly Cloudy75°F44°F34%1013.5 hPa
Selfridge Air National Guard Base, MI16 mi2 hrsSW 910.00 miMostly Cloudy74°F53°F49%1013 hPa
Detroit, Detroit Metropolitan Wayne County Airport, MI22 mi62 minSW 189.00 miMostly Cloudy and Breezy74°F54°F50%1013.9 hPa
Detroit/Grosse Ile, Grosse Ile Airport, MI24 mi63 minWSW 9 G 1710.00 miPartly Cloudy73°F52°F49%1013.5 hPa

Wind History from DET (wind in knots)
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Last 24hrE10SE11SE9SE5SE5SE5S6S10S13
G19
SW8SW13
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SW11SW11SW10SW13
G21
W13
G23
SW14
G21
W13
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SW14
G26
SW18
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W14SW15
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SW14SW8
1 day agoSE6SE5E8E4E5S3S3SW3CalmCalmSE3CalmCalmSE5SE9SE10SE12SE8SE8E9E11SE12S10SE8
2 days agoN13
G24
N18
G26
NW15
G23
N14
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N13
G27
N11
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N12
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N10
G17
N7N8N6N11N13
G19
N14NE96N10
G15
N9
G15
N5CalmSE9E5

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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Weather Map
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IR Satellite Image from GEOS
east_satellite

GOES Local Image of GreatLakes    EDIT
Geos

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.