Snow Signal Pacific

ENSO · MJO · PNA · Jet Stream · Satellite — 北太平洋滑雪氣候情報中心

Live imagery

ENSO / Live NOAA CPC

LOADING… NOAA

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正在讀取 NOAA ENSO observation、RONI 與官方機率 outlook…

Weekly Niño 3.4

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latest weekly anomaly

Monthly Niño 3.4

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relative Niño 3.4

Latest RONI

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3-month relative index

Weekly trend

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Niño 3.4 — last 12 weeks

Weekly relative SST anomaly

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Official NOAA ENSO probability outlook

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Season	La Niña	Neutral	El Niño
Loading NOAA probabilities…

NOAA probabilities ↗ENSO Discussion ↗

Intraseasonal & Teleconnection

每天到數週尺度

MJO — Live Observation
JMA RMM index · NOAA CPC phase diagram

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Current phase

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JMA

Region

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RMM phase region

Amplitude

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Trend

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3-day amplitude change

BC Interpretation

正在讀取 JMA MJO 資料…

圖中離中心越遠代表 MJO amplitude 越強。上方數值由 Snow Signal API 自動解析；這裡先做 observation，下一階段再加入 GEFS / ECMWF MJO forecast。

Open NOAA MJO source ↗

PNA — Live Observation + GEFS Forecast
NOAA CPC · live observed index + ensemble forecast

PNA: —Loading…

Current PNA

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NOAA CPC

7-day average

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observed mean

7-day change

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BC Interpretation

正在讀取 NOAA CPC PNA 資料…

上方數字由 Snow Signal 的 Vercel Function 自動讀取 NOAA CPC 觀測 CSV；圖片則保留 GEFS ensemble forecast。之後我們會再解析 GEFS CSV，加入真正的 7–14 天 forecast score。

Open PNA source ↗

North Pacific Flow

風暴路徑與高空氣流

Jet Stream — Live 250 hPa Analysis
NOAA GFS via Open-Meteo · Snow Signal jet detector

BC: —Loading…

Current jet core

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250 hPa

Core speed

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Flow

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wind direction

72h core

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forecast trend

Jet core latitude — next 72 hours

Higher latitude = farther north

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Forecast	Core latitude	Speed	BC signal
Loading GFS jet analysis…

BC Interpretation

正在分析 North Pacific 250 hPa jet…

上方數值是 Snow Signal 對 GFS 250 hPa wind 的第一版自動分析；Air Mass RGB 則提供即時大尺度視覺背景。Jet detector 目前是 21 個取樣點的 v0.1，後續會升級成 2D jet-axis analysis。

NCEP 250 hPa guidance ↗GOES source ↗

GOES-West Satellite
Northern Pacific · GeoColor

Live

GOES-West Northern Pacific GeoColor satellite

用來直接看 North Pacific storm train、低壓系統、雲帶與進入 BC coast 的水氣結構。後續可以加 water vapor 與 atmospheric river layer。

Open full satellite viewer ↗

Satellite History

GOES-West · 每日固定時間 · 最近 7 天

Pacific Satellite — 7-Day History
NOAA GOES-18 · Vancouver local time

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Loading satellite history…—

How to read this

GeoColor is best for cloud/storm evolution. Snow/Ice Band 5 can support snow/ice identification, but cloud can hide the ground and this is not a snow-depth measurement.

Surface Snow Cover

MODIS daily overview · Sentinel-2 high resolution

BC / Whistler Daily Snow Cover
NASA MODIS Terra · ~500 m

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Loading MODIS snow cover…Surface cover, not snow depth

MODIS is the broad daily overview. It is useful for seeing where snow cover is expanding across BC, but ~500 m pixels are too coarse for individual ski runs and cloud can hide the surface.

Whistler High-Res Snow Monitor
Copernicus Sentinel-2 L2A · 10–20 m source resolution

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Selected pass

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latest clear pass

Snow coverage

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of visible terrain

Visible terrain

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usable local pixels

Cloud / obscured

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cloud + cloud shadow

Confidence

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local snow estimate

Scene cloud cover

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technical scene metadata

Sentinel-2 Whistler high-resolution imagery

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Available Sentinel-2 Passes

Whistler Satellite Snow Coverage Trendclear visible terrain only

Loading recent snow coverage…

Sentinel-2 is the detailed resort view. Click any available pass to switch dates. “Snow coverage” is the percentage of visible valid terrain classified as snow inside our current Whistler/Blackcomb monitoring box. It is not snow depth and is not yet restricted to terrain above 1,800 m or the exact ski-area boundary.

Whistler Mountain Weather

GFS · 0–7 天雪場預報

Whistler Blackcomb — Live Mountain Forecast
Village 675 m · Roundhouse 1,850 m · Peak 2,182 m

SNOW: —Loading…

Peak temperature

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2,182 m

Next 24h snow

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modelled snowfall

Next 72h snow

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modelled snowfall

Freezing level

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Peak modelled snowfall — next 7 days

GFS snowfall estimate at 2,182 m

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Elevation	Temp	Wind	7d snow
Loading mountain levels…

850 hPa temperature

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lower-atmosphere thermal profile

72h avg freezing level

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storm snow-line context

Whistler Interpretation

正在分析 Whistler mountain temperature、snowfall 與 freezing level…

Date	Peak snow	Peak temp	Freezing level avg	Precip chance
Loading 7-day forecast…

Snowfall 是 GFS modelled snowfall，不是雪場實測新雪。這一層會在下一步和 ENSO、MJO、PNA、Jet Stream 融合，產生 Snow Signal Score、Powder Potential 與 Best Ski Day。

Blackcomb Mountain — Snow Signal 2D Map

Perspective resort view · clickable runs · GPS map preserved

Blackcomb Mountain2D terrain · skier view · 90°

Overview

Official-map audit · geometry corrected
Confirmed duplicate geometry removed · Easy Out fully merged

Zoom in for more trail detail · names appear on selection

Map Cleanup Mode

Blackcomb Map Cleanup

Use this only for confirmed map corrections. Normal users never see this panel.

Confirmed geometry

These confirmed corrections are now applied to the normal main map.

✓ Sunset Boulevard → Easy Out → Sunnyside Up
✓ Everglades duplicate component removed
✓ Expressway duplicate component removed

Exact phantom-feature cleanup

Click the bad line itself. For trails, only the clicked geometry component (lineIndex) is marked — never the whole official run.

Nothing selected

Mapbox public token needed

Open mapbox-config.js and paste your own public token that starts with pk..

Do not send the token in chat. Save, deploy, then reload.

Green Blue Black / Expert Lift Selected run

Snow Signal Resort Map uses stored GIS geometry plus a custom landmark-based layout calibration so Whistler and Blackcomb read more like a skier trail map. It is not a copy or tracing of Whistler Blackcomb's official artwork and is not intended for emergency, closure or avalanche navigation.

Best Runs Right Now

Deterministic Snow Signal ranking · current map view

Analyze the current resort view

Ranks a small representative set using the existing trail-condition engine. No AI guessing.

Ready

Choose Whistler, Blackcomb, or a pull-out area above, then analyze the best representative runs in that view.

MVP scope: this does not yet score every official run. It evaluates a limited set of representative mapped runs to validate ranking logic before we build the full server-side recommendation engine.

Whistler Trail Conditions

Named run · aspect-aware hourly surface forecast

Terrain Snow Condition Engine / Named Run

Harmony Ridge

搜尋 Whistler 雪道名稱，查看依坡向、太陽角度與每小時天氣推估的雪面狀態。

READY

Difficulty

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OSM piste difficulty

Grooming

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when mapped

Aspect

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approx downhill heading

Reference elevation

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whole-run reference elevation

Slope model

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whole-run reference

Length

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mapped piste length

Best window

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today

Softening after

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solar / thermal estimate

Slushy risk after

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if melt threshold is reached

Refreeze / ice after

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freeze-thaw estimate

Upper / Middle / Lower terrain DEM-derived elevation + slope · segment-specific aspect

Loading segment terrain…

Whole-run hourly reference · 08:00–16:00

Loading Harmony Ridge…

Trail Interpretation
Select a named run to calculate today's aspect-aware surface conditions.

Upper / middle / lower are equal-distance thirds of the mapped piste. Each segment now uses its own DEM-derived elevation, slope and aspect; official resort section boundaries, grooming changes, shade and microterrain are still future refinements.

下一階段：Snow Signal Score + AI Interpretation

把所有訊號融合成滑雪決策

ENSO

Season

背景：數月尺度

MJO / PNA

2–4 wk

型態轉換與可預測窗口

Jet / Storm track

7–14 d

風暴路徑與 ridge/trough

Mountain weather

0–7 d

雪量、雪線、風、SWE

最後會把四層訊號融合，輸出例如：Whistler Powder Probability、Snow Quality、Freezing Level Risk、Wind Hold Risk、Best Ski Day，而不是讓使用者自己讀十張氣象圖。