Wednesday, May27, 2020
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Marine Weather and Tides
Chatham, MI

Version 3.4
NOTICE
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 6:01AMSunset 9:32PM Wednesday May 27, 2020 2:06 AM EDT (06:06 UTC) Moonrise 9:14AMMoonset 12:19AM Illumination 26% Phase: Waxing Crescent; Moon at 5 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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LSZ249 1040 am edt Fri may 15 2020 a marine weather statement has been issued for the following areas... Grand marais to whitefish point mi... Lake superior east of a line from manitou island to marquette mi and west of a line from grand marais mi to the us/canadian border beyond 5nm from shore... Lake superior from grand marais mi to whitefish point mi 5nm off shore to the us/canadian border... Marquette to munising mi... Munising to grand marais mi... At 1039 am edt, doppler radar indicated a strong Thunderstorm, capable of producing winds to around 30 knots and small hail. This Thunderstorm was located 19 nm north of grand island, moving east at 25 knots. Precautionary/preparedness actions... Mariners can expect gusty winds to around 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until this storm passes. && lat...lon 4663 8615 4654 8638 4673 8707 4700 8685 4691 8597 4663 8596
LSZ249 Expires:202005151615;;206880 FZUS73 KMQT 151440 MWSMQT Marine Weather Statement National Weather Service Marquette MI 1040 AM EDT Fri May 15 2020 LSZ249>251-266-267-151615-


7 Day Forecast for Marine Location Near Chatham, MI
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location: 46.43, -86.84     debug


Area Discussion for - Marquette, MI
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FXUS63 KMQT 270537 AFDMQT

Area Forecast Discussion National Weather Service Marquette MI 137 AM EDT Wed May 27 2020

SHORT TERM. (This evening through Wednesday) Issued at 310 PM EDT TUE MAY 26 2020

Unseasonably warm and humid conditions will continue through Wednesday before some relief thereafter. Isolated to scattered convection will continue to dot the radar across the western U.P. this afternoon into early evening. Activity is being driven solely by daytime heating in the absence of any real upper support (weak shortwaves) and no additional low level forcing. Weak surface low over northern MN with a surface boundary extending southward through eastern MN will be the focus for more organized shower and thunderstorm activity this evening. Some of the remnant from that activity will flirt with the far western U.P. overnight tonight. In addition . increasing low level jet of up to 50 knots aimed into northern WI/the far western U.P. should be enough to keep some of this activity going through the night.

Expected another very warm and muggy night tonight with record high low temperatures in jeopardy for some. Overnight lows will stay in the 60s for most.

Wednesday will be similar to today for many. Remnants of overnight shras/tsras from northern WI into the far western U.P. may lay out a boundary which could focus shra/tsra activity a bit further east on Wednesday . especially if any weak shortwave lobes can lift northward out of the Upper Midwest. Will carry highest chance pops over the central U.P. tomorrow afternoon. Still expect another very warm and humid day with highs in the 80s except near Lake Michigan and over the far west.

LONG TERM. (Wednesday night through Tuesday) Issued at 320 PM EDT TUE MAY 26 2020

Upper air pattern will have a shortwave across the Canadian Prairies and northern plains and another over the southern plains 00z Thu. The northern shortwave digs southeast into the upper Great Lakes 00z Fri and becomes a deep trough over the ern U.S. 00z Sat. 850-500 mb q-vector convergence and deeper moisture remain over the area Wed night into Thu afternoon. This will slow down the system as it comes through the area with a slow retreat east of the pops. Overall, did not make too many changes to the going forecast.

In the extended, the GFS and ECMWF show a 500 mb trough over the ern half of the U.S. 12z Sat with a ridge over the Rockies with a trough off the west coast. The upper pattern remains stationary through Sun and then the ridge moves out into the plains 12z Mon. The ridge then moves slowly east towards the upper Great Lakes 12z Tue. Temperatures will begin a warming trend again in this range with temperatures going above normal by early next week.

AVIATION. (For the 06Z TAFS through 06Z Wednesday night) Issued at 136 AM EDT WED MAY 27 2020

Showers and thunderstorms continue over the western TAF sites early this morning but will end before daybreak. All three sites will be experiencing LLWS early this morning as the low level jet continues over the area. Expect low end MVFR ceilings across KIWD and KCMX late tonight but ceilings will improve during the mid morning hours. Some patchy fog is also possible at KCMX and KIWD overnight. VFR conditions return during the day over the western sites. A s the area becomes more unstable with daytime heating, the possibility of showers and thunderstorms return to the area during the afternoon and evening hours.

MARINE. (For the 4 PM Lake Superior forecast issuance) Issued at 310 PM EDT TUE MAY 26 2020

With a warm air mass over the area, the cold marine layer will assist in keeping winds on the lighter side across Lake Superior into Thu. This is especially true since a relatively weak pressure gradient will also prevail. Expect winds to be under 20kt into Thu. Passage of a stronger cold front later Thu will offer the potential of stronger winds in the Thu night into early Sat time frame. Would not be surprised to see some 20-30kt winds for a time at some point over the e half of the lake. Winds will then diminish over the weekend as high pres settles over the western Great Lakes.

Fog, shifting with the prevailing winds, will continue to plague Lake Superior until the stronger cold front moves across the lake later Thu. The fog will likely be dense at times.

MQT WATCHES/WARNINGS/ADVISORIES. Upper Michigan . None. Lake Superior . Dense Fog Advisory until 2 PM EDT /1 PM CDT/ this afternoon for LSZ162-263-264.

Lake Michigan . Dense Fog Advisory until 2 PM EDT this afternoon for LMZ248-250.



SHORT TERM . MZ LONG TERM . 07 AVIATION . RJT MARINE . MZ


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KP53 10 mi71 min S 7 69°F 1012.5 hPa61°F
MCGM4 - 9099018 - Marquette C.G., MI 30 mi49 min Calm G 1.9 56°F 1011.3 hPa55°F
GRIM4 36 mi17 min SSE 20 G 20 67°F 1011.3 hPa64°F
GR4 - Grand Marais, MI 49 mi27 min S 16 G 23 71°F 1013.5 hPa
BIGM4 - Big Bay, MI 54 mi27 min S 2.9 G 8.9 64°F 1009.8 hPa

Wind History for Marquette C.G., MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Munising - Munising Lakeshore Observation, MI10 mi11 minS 5 mi68°F61°F78%1012.4 hPa

Link to 5 minute data for KP53

Wind History from P53 (wind in knots)
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Last 24hrS7S9S8S9S5S4S5S6S76
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2 days agoCalmCalmCalmSW3SW3SW3S553NE6N3N7CalmCalmNW3NE7N3CalmCalmCalmS8S6S6S5

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
Wind Forecast for Marquette, MI (2,6,7,8)
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Ground Weather Radar Station Marquette, MI
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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 numerous 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.