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• GREAT LAKES SURF REPORT
• NITETIME.NET // FEATURE EDITION // OCTOBER 18, 2026
• GREAT LAKES SURF REPORT: WAVES, MOONLIGHT, AND THE FRESHWATER NIGHT DESK
• NITETIME.NET // October 18, 2026
• Some stations cover oceans. NITETIME has five inland seas, a moon
• fixation, and a weather desk with more enthusiasm than furniture. Great
• Lakes Surf Report brings Superior, Michigan, Huron, Erie, and Ontario
• into one place: https://surf.nitetime.net/ . It combines marine wave
• forecasts, recent station observations, and an astronomical night desk.
• The attitude belongs to NITETIME. The measurements and forecasts have
• named sources and timestamps.
• The original dispatch introduced a wave-and-moon forecast. The site has
• since grown into a surf-weather hub, with a station leaderboard,
• shoreline weather, daylight and moon calculations, water temperatures,
• and the original forecast timeline. This article describes those tools
• and the distinctions that make their numbers useful.
• START WITH THE LAKE, THEN THE SHORELINE
• Five clickable lake outlines lead into thirteen selected U.S. shoreline
• forecast desks. Choose a lake and a point, then choose feet or metres
• and a 24-, 48-, 72-hour, or coming-week view. The hourly plot and slider
• let you inspect a particular forecast hour. Daily peak controls jump to
• the larger forecast windows, and an hourly table provides the same
• information without requiring you to read the graph.
• These points sample a large region. They do not claim to describe every
• beach or every part of a lake. The shoreline selection matters because
• the page associates its forecast, local clock, weather observations, and
• astronomical calculations with that place.
• FORECASTS HAVE A SOURCE AND AN EXPIRATION DATE
• The wave guidance comes from NOAA / National Weather Service marine
• forecast grids. The report displays source issue and retrieval times,
• marine alerts, and missing or stale states. Its wave watch ranks
• eligible forecast windows by wave height, period, and then lighter wind.
• That is a way to sort available guidance, not a universal rating of surf
• quality.
• There is roughly a week of wave guidance when the provider supplies it.
• The long-range desk links separately to NOAA's broader outlooks. Those
• outlooks do not become invented hourly wave heights for a second week.
• If a future moon event lies beyond the available forecast, the site can
• show the moon date while leaving the corresponding wave forecast absent.
• The collection system excludes failed or cached grids from the wave
• watch. Its documented freshness rules also exclude NOAA issue times
• older than eighteen hours or retrievals older than two hours. A retained
• snapshot can still explain what the system last knew; it must not
• quietly become a new observation.
• A marine-grid wave height is not a promise of a clean breaking wave at a
• particular beach. Local shoreline shape, exposure, and conditions are
• outside that single number. The forecast is useful evidence to read
• alongside warnings and local knowledge.
• THE GNARLIEST PLACES RIGHT NOW
• The station leaderboard answers a different question from the forecast:
• what are selected reporting stations measuring? It can sort by observed
• wave height, the maximum reported sustained wind or gust, coldest air,
• coldest water, or lowest visibility. It does not merge these into a
• supposedly scientific danger score.
• The documented catalog contains 111 selected marine and coastal stations
• identified from NOAA's National Data Buoy Center metadata. It includes
• Canadian-partner observations relayed by NDBC. That is a curated
• catalog, not exhaustive coverage, and the number reporting usable values
• changes with availability and seasonal deployment.
• The board follows the selected lake. It does not inherit the forecast
• horizon or night and moon filters. Each metric excludes missing
• readings, failed refreshes, and observations or fetches older than two
• hours, with a small allowance for clock differences. Each card
• identifies the station, source, and time. Calculated moon context is
• displayed separately from the measured conditions.
• This distinction is the heart of the page: an observation describes a
• reporting station at a recorded time; a forecast describes expected
• conditions; an astronomical calculation describes the sky's geometry.
• Putting them on one screen does not make them interchangeable.
• THREE DESKS FOR THE SHORELINE
• FOG OFFICE uses nearby land-station observations to show reported
• visibility and weather, air temperature and dew point, wind and gusts,
• station distance, and observation time. Low visibility alone does not
• establish that fog caused it. The shoreline weather lookup rejects
• stations more than 75 kilometres away rather than treating any available
• reading as local.
• LAST LIGHT lists sunset, the end of civil twilight, dawn, sunrise,
• moonrise and moonset, along with current calculated sun and moon
• positions and estimated lunar illumination. These are SunCalc
• calculations for the selected shoreline coordinates. Times are displayed
• in that shoreline's local time, with daylight-saving handling, rather
• than assuming the visitor's computer is beside the lake. Civil twilight
• ends when the sun is six degrees below the horizon.
• WATER DOES NOT LOVE YOU finds a station on the same lake with a fresh
• water-temperature reading within 80 kilometres. It names the station and
• gives distance and time. Air temperature is never substituted for water
• temperature. A nearby instrument is still not an exact measurement at
• the reader's beach, and the page keeps that limitation visible.
• THE MOON GETS ITS OWN SHIFT
• NIGHT SHIFT selects 20:00 through 06:00 on the local shoreline clock.
• That is an explicit clock-time filter, not a claim that the entire
• interval is dark in every season. LAST LIGHT provides the separate
• astronomical context.
• The combined timeline places wave height beside estimated lunar disc
• illumination using separate labelled axes. The selected-hour readout and
• hourly table include moon information; daily moon values refer to the
• same hour as that day's selected wave peak. Above- and below-horizon
• estimates indicate whether the moon is geometrically up at that location
• and hour.
• The lunar calendar uses official U.S. Naval Observatory timestamps for
• primary phases. Full- and new-moon filters select the twenty-four hours
• on either side of the event, then intersect that window with the
• overnight hours. Local calculations supply illumination and position;
• USNO supplies the exact primary-phase event dates used by the calendar.
• FLOODLIT and LIGHTS OUT are the night desk's labels. They are not
• predictions of actual illumination on the water. Clouds and observed sky
• brightness are not supplied by these calculations. Lunar phase does not
• produce a wave-size estimate or a danger score. The moon provides
• context, not permission.
• A SMALL COLLECTOR BEHIND THE PAGE
• The public interface reads a server-produced JSON snapshot. A Python
• collector retrieves forecast grids and marine alerts, NDBC observations,
• NWS station weather, and USNO phase data. The existing refresh timer
• runs about every thirty minutes, with a small scheduling variation.
• Provider requests happen on the server; the browser does not need
• weather API credentials.
• Successful updates publish the snapshot atomically so readers receive a
• complete version. On failure, retained data keeps its original
• timestamps and is marked as cached. Missing values stay missing. The
• browser refreshes snapshots every five minutes while visible and
• rechecks observation freshness and astronomy every minute. Frequent
• screen updates do not imply that a remote buoy has issued a new
• measurement.
• The interface includes a readable hourly table and was checked on
• desktop and narrow phone layouts. Source and time labels travel with the
• numbers. The old main-domain /surf/ address redirects to the dedicated
• subdomain. The page links back to NITETIME.NET and the Gopher shelves;
• the station's homepage now also provides a direct entrance.
• FRESHWATER, HEAVY CONSEQUENCES
• The desk's unofficial line is that the big ones mostly come out at
• night. That is newsroom atmosphere, not a meteorological result. The
• actual forecast gets the vote, and missing measurements do not become
• excitement just because the page has a loud voice.
• The site's warning is direct: this sport is dangerous, and entering the
• water is at your own risk. Read marine warnings and consider local
• access, cold water, currents, and ice. Night coverage is for studying
• the conditions; a moon icon is not an assurance that entering the lake
• is safe.
• The value of this report is the ability to look across several kinds of
• evidence without hiding where each came from. Pick a lake. Read the
• timestamp. Inspect the forecast. Check what nearby stations actually
• report. Then let the night desk provide the commentary while the sources
• supply the facts.
• Technical basis: NITETIME server's Great Lakes Surf Weather deployment
• and observation-hub records, updated October 14, 2026. This is an
• independent NITETIME publication; NOAA and USNO provide source
• information, not endorsement. This article describes the service, not
• current water conditions.
• [WEB]OPEN THE WEBSITE
• [WEB]NOAA / NWS DATA DOCUMENTATION
• [WEB]NDBC MEASUREMENT GUIDE
• [WEB]USNO MOON PHASES
• [TXT]PLAIN TEXT EDITION
• [DIR]RETURN TO NITETIME.NET
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