Saturday, April4, 2020
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Marine Weather and Tides
Munising, 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 7:20AMSunset 8:24PM Saturday April 4, 2020 10:28 PM EDT (02:28 UTC) Moonrise 2:56PMMoonset 4:58AM Illumination 91% 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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LSZ249 133 pm edt Mon sep 30 2019 a marine weather statement has been issued for the following areas... Grand marais to whitefish point mi... Green bay north of line from cedar river mi to rock island passage... 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 133 pm edt, doppler radar indicated strong Thunderstorms, capable of producing winds to around 30 knots and small hail. These Thunderstorms were located along a line extending from 33 nm northwest of minneapolis shoal to 24 nm northwest of grand sable dunes, moving east at 35 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 these storms pass. This strong Thunderstorms will likely produce winds to around 30 knots, and could pose a serious hazard for boaters. A special marine warning may eventually be required when these storms reach the nearshore waters. Boaters should consider heading for shore before these storms arrive. && lat...lon 4694 8523 4663 8559 4663 8615 4653 8642 4637 8665 4643 8677 4639 8690 4596 8695 4592 8688 4577 8691 4581 8712 4595 8696 4640 8690 4649 8702 4703 8642
LSZ249 Expires:201909301830;;005276 FZUS73 KMQT 301733 MWSMQT Marine Weather Statement National Weather Service Marquette MI 133 PM EDT Mon Sep 30 2019 LMZ221-LSZ249>251-266-267-301830-


7 Day Forecast for Marine Location Near Munising, MI
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location: 46.38, -86.71     debug


Area Discussion for - Marquette, MI
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FXUS63 KMQT 042231 AFDMQT

Area Forecast Discussion National Weather Service Marquette MI 631 PM EDT Sat Apr 4 2020

SHORT TERM. (This evening through Sunday) Issued at 359 PM EDT SAT APR 4 2020

WV imagery and RAP analysis indicated mid/upper level troughing from Northwest Territories and northern Alberta into northwest Ontario. A shortwave trough and cold front that supported pcpn over the east this morning has moved east of the area leaving lingering clouds east of P53-ESC. Although high pressure building into the area has brought clearing skies, sunshine in the cool airmass has only boosted temps into the low and mid 30s north to around 40 south.

Tonight, High pressure settling over the area with clear skies, light winds and PWAT values to around 0.10 inch will result in very favorable radiational cooling. Expect inland min temps near the low end of guidance with readings from around 10 in the typical cold spots to around 20 closer to the Great Lakes.

Sunday, weak WAA along with abundant sunshine will push temps inot the upper 40s north and east to the mid 50s southwest given 850 mb temps to -1C and mixing through 4k-6k ft. Dewpoints should also fall off to around 10F with RH values to around 20 percent.

LONG TERM. (Sunday night through Saturday) Issued at 356 PM EDT SAT APR 4 2020

Models suggest a positive height anomaly and associated ridge across the N Pacific this morning will slowly weaken and shift E into the beginning of next week. As a trough forms across the West Coast in response to this ridge, it digs south towards the desert SW and will become a cutoff feature by Tuesday night as a split-flow pattern develops across the CONUS. The northern stream will dominate the Great Lakes region through the mid-week, but models suggest these two features will congeal towards the end of week with widespread troughing and negative height anomalies expected across much of the CONUS by next weekend. This idea is depicted similarly in both the deterministic and ensemble medium range models. Above normal temperatures are expected through the middle of next week with ridging building in on Monday into Wednesday morning, before models show a shortwave passing through on Wednesday bringing widespread precipitation chances and a cooldown into the weekend.

On Sunday night into Monday, high pressure will be in play across the Great Lakes region with dry, but cloudy weather expected through early Monday morning. Upstream, a shortwave embedded in the northern split-flow stream passes through the Rockies and into the Dakotas by Monday evening. At the same time, a ridge is building into the Upper Midwest with associated WAA and isentropic ascent. Models suggest a rather tight gradient in the isentropes, but vary slightly in associated wind magnitudes at the respective levels. Given the Pacific origin, PWAT values are not anything to write home about, with models suggesting 0.5 to 0.75 inches across the UP. The best forcing remains off into WI, but there still remains a chance of rain across the UP Monday morning into Monday night. The best chances, however, look to be west and along the WI state line with the chance of some mixed precipitation right away in the morning and again at night.

The next chance of precip comes Tuesday into Tuesday night as a shortwave trough ejects along the northern portion of the flow. An area of low pressure develops and lifts from the Dakotas over Upper Michigan. Southerly flow ahead of this system will bring an increase of theta-e advection as NAM and GFS suggest some CAPE moving into the region. NAM keeps most of this CAPE to the south through WI, but the GFS does bring a few 100 J/kg into the UP along the WI border, so I have included some thunder chances into the forecast. Otherwise, expect widespread rain showers across the CWA on Tuesday, tapering off from west to east in the evening. With PWATs nearing 0.75 inches, models are suggesting the potential for up to a 0.5 inch of rain across the CWA. Models show some differences with the GFS remaining fairly consistent with the majority of the precip just to the north over Lake Superior and another batch off the south downstate. The GEM has remained fairly consistent just to the south of the GFS across the central UP, with similar amounts. Will need to wait another 24 hours to get a better sense of where things really line up so PoPs and QPF are fairly broad-brushed.

As the cutoff feature across the SW moves on shore and over the desert SW, another trough approaches the UP Wednesday afternoon/evening. There is not much return flow between the systems, but models suggest some -SHRA out in front over the associated cold front. Behind this wave, more NW flow increases and 850mb temperatures fall to near -12C. With sfc temps well above freezing, there's a chance to see some lake-effect rain showers on Friday, but otherwise nothing major on the horizon and temperatures fall mid 30s to 40 on Friday with 40s returning Saturday.

AVIATION. (For the 00Z TAFS through 00Z Sunday evening) Issued at 631 PM EDT SAT APR 4 2020

VFR conditions will continue thru the forecast period.

MARINE. (For the 4 PM Lake Superior forecast issuance) Issued at 359 PM EDT SAT APR 4 2020

Winds to 25 knots in the wake of a cold front will diminish from w to e late this aftn into tonight as high pres approaches from the west and settles over the area. Expect winds under 15kt across Lake Superior by late tonight, continuing into Sun as high pres lingers. Winds should remain light into Mon before easterly winds increase Mon night into Tue as a low pres trough approaches. Gusts up to 20- 25kt will be possible.

MQT WATCHES/WARNINGS/ADVISORIES. Upper Michigan . None. Lake Superior . None. Lake Michigan . None.

SHORT TERM . JLB LONG TERM . JAW AVIATION . 07 MARINE . JLB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KP53 4 mi33 min S 2.9 27°F 1022.2 hPa23°F
MCGM4 - 9099018 - Marquette C.G., MI 37 mi59 min NW 2.9 G 7 30°F 1020.6 hPa22°F
GR4 - Grand Marais, MI 44 mi49 min WNW 15 G 19 30°F 1021.7 hPa
GRIM4 44 mi39 min NW 16 G 18 32°F 1021.1 hPa26°F
FPTM4 - Fairport, MI 53 mi49 min NE 1.9 G 4.1 31°F 1021.3 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, MI4 mi33 minS 3 mi27°F23°F85%1022.2 hPa

Link to 5 minute data for KP53

Wind History from P53 (wind in knots)
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Last 24hrSW6S4CalmNW12N13N10NW13
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N12N8N8N5S3
1 day agoS3CalmS4S34S3S4S6CalmSW44S546S11S7S8S7S7
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2 days agoCalmCalmCalmCalmCalmS4S4S4S4S5S4CalmE4NE6NE7N6NE6N3N4--NW4--CalmS5

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Marquette, MI (22,6,7,8)
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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.