Tuesday, September29, 2020
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Marine Weather and Tides
Port Huron, MI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:24AMSunset 7:15PM Tuesday September 29, 2020 9:15 AM EDT (13:15 UTC) Moonrise 5:48PMMoonset 3:55AM Illumination 93% Phase: Waxing Gibbous; Moon at 12 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- 400 Am Edt Tue Sep 29 2020
Today..Southwest winds 10 to 15 knots diminishing to 5 to 10 knots in the afternoon. Partly cloudy in the morning, then mostly cloudy with a slight chance of light showers in the afternoon. Waves 2 feet or less.
Tonight..Southwest winds 10 to 15 knots. Mostly cloudy with a slight chance of light showers in the evening, then partly cloudy with a chance of light showers after midnight. Waves 2 feet or less.
Wednesday..Southwest winds 15 to 20 knots. Mostly cloudy with light showers likely in the morning, then partly cloudy with light showers likely in the afternoon. Waves 1 to 3 feet.
Wednesday night..West winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Mostly cloudy with light showers likely in the evening, then mostly clear after midnight. A chance of waterspouts. Waves 1 to 3 feet. SEe lake huron open lake forecast for days 3 through 5.
LHZ443 Expires:202009291500;;532989 FZUS53 KDTX 290800 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 400 AM EDT Tue Sep 29 2020 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. LHZ443-291500-


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 290952 AFDDTX

Area Forecast Discussion National Weather Service Detroit/Pontiac MI 552 AM EDT Tue Sep 29 2020

AVIATION.

Skies will be a bit chaotic to start the day as residual low level moisture is showing up as sub 2kft SCT observations around the area. In addition there is a layer of cirrus and a plum of moisture coming inland off Lake Michigan around 5-7kft. All in all we are looking at VFR through most of the period. Stratocu will fill in this afternoon as a convergent band works across lower MI. Best chance of diurnal showers is north of PTK. Better forcing creating more widespread showers will arrive later tonight working from west to east. DTW looks to be on the southern edge of this forcing so may stay dry til later on Wednesday.

DTW THRESHOLD PROBABILITIES.

* High for cigs less than 5000 ft agl.

PREV DISCUSSION. Issued at 359 AM EDT Tue Sep 29 2020

DISCUSSION .

High amplitude troughing now entrenched throughout the central U.S. will take an increasing hold of local conditions this forecast period. Southeast Michigan will maintain a position within the immediately downstream flank of the mean trough axis today, leaving low to mid level southwest flow to govern conditions during the daylight period. Resident thermal profile generally characterized as seasonable by late September standards - little noted thermal advection and prospects for some peaks of sun affording modest diurnal temperature recovery. Highs generally mid 60s. An area of convergence will emerge late today, as the pressure gradient responds to height falls associated with the inbound trough axis. Moisture quality likely proves too limited to support a greater response, but the underlying ascent within a steep lapse rate environment held during peak heating may support a few showers from the Flint area northward into the Saginaw Valley/northern thumb late afternoon and evening.

Upper trough axis pivots into the area tonight, the eastward movement aided by strong shortwave energy now noted over western Quebec digging southeast into the existing height fall center. The combination of increasing cva and deeper layer, albeit modest cold air advection will maintain the chance for shower production this period, primarily M-59 corridor northward. A deeper layer of cold, moist cyclonic flow derived from the resident upper trough axis will then define conditions Wednesday. This steep lapse rate environment will yield the usual higher coverage of stratocumulus, while maintaining the potential for periodic shower development. Greatest window for rainfall will exist from mid afternoon into the evening hours, focused within another period of stronger cold air advection and an accompanying increase in downstream moisture flux off lake Michigan as overlake instability grows. A scattered to numerous coverage of showers likely during this time. The strongest updrafts may offer a few instances of lightning, small hail and gusty winds given the magnitude of lapse rates, suppressed freezing levels and a very dry sub-cloud layer.

A similarly unsettled environment will exist Thursday, as a period of even stronger cold air advection arrives during the back half of daytime heating. The underlying deep layer ascent and overall thermodynamic profile again points to a scattered to numerous coverage of late day showers. Highs Thursday struggling to climb out of the 50s. Prolonged period of cold air advection as deeper northwest flow takes hold continues into Thursday night, allowing 850 mb temperatures to near the freezing mark by Friday morning.

Conditions Friday into the upcoming weekend remain governed by high amplitude troughing. Stretch of well below normal temperatures entrenched during this period - daytime highs solidly in the 50s. Coldest conditions likely noted Saturday morning as high pressure slips across the region, allowing lows to dip well into the 30s most locations.

MARINE .

Low pressure departed the Great Lakes this morning, lifting north toward James Bay today. A tightened pressure gradient remains in place for the next few days as broad upper level troughing begins to take hold of the region. Winds will remain out of the west to southwest in the 15 to 20 kt range through the midweek period. Today should be mostly dry, but periodic showers returns to the lakes on Wednesday as another cold front pushes in. A much cooler air mass filtering in for the late week will bring a chance for waterspouts, especially over Lake Huron.

DTX WATCHES/WARNINGS/ADVISORIES. MI . NONE. Lake Huron . NONE. Lake St Clair . NONE. Michigan waters of Lake Erie . NONE.

AVIATION . DRK DISCUSSION . MR MARINE . TF

You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTGM4 - 9014098 - Fort Gratiot, MI 4 mi46 min WSW 7 G 9.9 51°F 1009 hPa49°F
MBRM4 - 9014090 - Mouth of the Black River, MI 6 mi46 min 53°F 1009.4 hPa
PSCM4 28 mi16 min W 4.1 G 9.9 53°F 1028.1 hPa (+1.3)
AGCM4 30 mi46 min 55°F 65°F1010.6 hPa
45149 - Southern Lake Huron 38 mi76 min WSW 14 G 16 56°F 63°F3 ft1008.8 hPa
45147 - Lake St Clair 46 mi16 min W 9.7 G 12 1 ft1009.1 hPa (+1.5)
CLSM4 - St. Clair Shores, MI 48 mi16 min WSW 8 G 9.9 53°F 1011.9 hPa (+1.4)

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 mi21 minN 07.00 miFair52°F50°F94%1010.8 hPa

Link to 5 minute data for KPHN

Wind History from PHN (wind in knots)
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Last 24hrCalmW4CalmNW3CalmW3NW4W7W8W3CalmCalmCalmCalmCalmCalmSW3SW3CalmSW3SW3SW3SW3S3
1 day agoSW6S13
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S9S8SW4CalmNW7CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoS5S7S7S12
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S9S9S7S8S7S9S11
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SW7S8S9SW6S9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Detroit, MI
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