A falling flake
A flake means the relevant model source window carries a positive snow signal at the mapped location. It is not a depth, a snow stake reading, or a claim that every part of a resort is snowing.
Mountains / 15-day ski snow map guide
A permanent map-reading guide
Read a 15-day ski snow map without mistaking it for a resort report.
A map can be a useful reason to look closer at a mountain. The useful part comes from keeping its two windows separate, treating flakes as a source signal, and ending with the people who actually run the place.
Days 1–7 + days 8–15Flakes = positive source signalNot conditions or a season call
This guide never loads a current map, previous result, snowfall total, or map-availability status.
The short version
A map signal is a cue to recheck, not a reason to declare a powder day.
The live map uses a current ECMWF Open Data IFS model source near listed mountain locations. It classifies model windows rather than translating a grid cell into resort snowfall, settled base, terrain access, or a day-of-skiing verdict.
The discipline is simple: use the map to notice a place, use a closer forecast where available, and use the operator for the decision that matters. That order creates useful snow stoke without asking a weather signal to answer questions it cannot answer.
The 7-day + 8-day workflow
Read the two horizons separately before you react.
The 15-day display uses one seven-day window followed by one eight-day window. They are not separate resort forecasts, and adding them together would create a confidence the source does not provide.
Use days 1–7 to choose where to inspect.
The first window is a short-range model signal. A positive marker can earn a closer look, but it is not an observed snow report, a resort total, or a promise that the day will ski well.
Treat days 8–15 as a separate, less certain window.
The second window is intentionally shown apart from days 1–7. Keeping the windows separate helps prevent a farther-out model idea from being read as one combined resort forecast.
For a U.S. mountain, request the NWS gridpoint view next.
The on-demand NWS page shows published six-hour new-snow windows for one selected representative point. Read its source time and point details before using it as a closer planning check.
Open the U.S. NWS snow outlookFinish at the operator before travel or a ski-day decision.
The resort is the source for lifts, terrain, roads, parking, reservations, closures, and its own conditions report. A model map cannot settle any of those questions.
Open direct operator reports
What the symbols mean
Let the map stay categorical.
A major marker
A major marker is a more prominent display category in that exact source window. It is not a “mega forecast,” a resort-level total, a condition report, or a prediction of the whole season.
No flake
No positive source signal is not proof of dry weather, poor skiing, or a closed mountain. It only says the displayed map has no positive signal to show for that place in that window.
What stays outside the map
A short-range model signal cannot make a seasonal or operational call.
- It does not report observed snow, snowfall totals, base depth, grooming, lifts, terrain, roads, or parking.
- It does not predict which resort will be best, where a skier should travel, or whether a ski day will be safe.
- It does not make a month-ahead or season-ahead snowfall claim. A 15-day source window is not a seasonal outlook.
- It does not replace a pass seller's access rules, a resort's reservation system, or the operator's final information.
Keep the decision separate
Use weather context to plan a check—not to let a map buy a pass for you.
When the mountains and ski days you actually want are clear, use pass math that keeps dated prices, documented caps, and official rechecks visible. A map signal does not add a mountain to your itinerary or change a pass's terms.
Questions people ask before they chase a signal
15-day ski snow map FAQ
Is this a 15-day ski forecast?
It is a guide to reading a 15-day ECMWF model-signal map. The map can show a current source window when that source validates, but this guide does not turn that window into a ski-day, resort-conditions, or seasonal forecast.
What does a falling flake mean?
A falling flake marks a positive model snow signal in the displayed source window. It does not state a snowfall depth, settled base, terrain opening, lift status, road condition, or likelihood of a good ski day.
What does a major marker mean?
A major marker is a more prominent display category within that exact model source window. It is not a “mega forecast,” a resort-level snowfall prediction, or a claim about a season.
Why might the live map show no flakes or no map?
No flake means the displayed source window has no positive signal for that marker; it does not prove dry weather or poor skiing. If the source snapshot cannot be validated, the live map withholds all markers rather than retaining an old result.
Can I use a map signal to choose or buy a ski pass?
No. The map is a short-range planning cue, not a pass recommendation. Build a pass plan from the mountains and days you actually intend to ski, then recheck the relevant operator before buying.
Read the source language before you share the map.
The model source is described by ECMWF Open Data documentation . For the U.S. gridpoint path, see the National Weather Service API documentation . For the site's model, source, and operating-information boundaries, see Data & sources.