📈 Forecast Data — 16-Day Trends
💧 Precipitation Probability
⚡ CAPE Instability (J/kg)
📊 Model Comparison — What Each Model Predicts
☁ Extended Forecast Data
☁ Cloud Cover %
Daily cloud cover — lower is clearer skies
🌡 Soil Temperature
Ground surface temp — frost/thaw indicator
💨 Precipitation Amount
Forecasted rain + snow in inches per day
❄ Daily Snowfall Forecast
Forecasted snow accumulation per day (inches)
🌀 Wind Direction
Dominant wind direction — compass bearing per day
👁 Visibility Forecast
Viewing distance in miles — fog and haze impact
📊 Model Deep Dive
🌡 Model Lo Temp Spread
What each model predicts for tomorrow's low
📈 Model Agreement Score
How much models agree — high = high confidence
📚 Historical Record — 20 Years of Sierra Weather
Deep historical analysis using Open-Meteo's archive. Seasonal snowfall, precipitation trends, temperature records, and growing season data for the Truckee/North Tahoe area.
❄ Seasonal Snowfall — 20 Winter Seasons
Total snowfall per winter season (Oct-Apr) in inches — current season highlighted
💧 Annual Precipitation History
Yearly rain (blue) and snowfall (cyan) — dual axis grouped bars
🌡 Historical Monthly Temperatures
20-year average hi/lo by month vs current year overlay
🌡 Record Temperatures by Month
All-time record highs and lows for each month — 20 year range
❄ First & Last Snow Dates
When snow season started and ended each year
🌱 Growing Season Length
Days between last spring frost and first fall frost
🌎 Seasonal Outlook & Climate Signals
🌎 El Niño & the Winter Outlook
The season outlook and the latest NOAA El Niño numbers are written up in plain English in the Blog tab, dated to the NOAA update they come from, and refreshed when NOAA publishes a new one (second Thursday of each month). The seasonal and monthly maps above update themselves from NOAA.
🌈 Atmospheric Analysis
💧 Precipitable Water
Total moisture in atmosphere column — atmospheric river indicator
🌙 Solar & Astronomical
🌅 Sunrise & Sunset Times
Daily sunrise and sunset times showing the daylight curve
📈 Seismic Activity — 100mi Radius
🌏 Recent Earthquakes
USGS seismic events near Truckee — last 30 days
📡 Station Network Analysis
Real-time comparison of nearby NWS observation stations. See temperature, pressure, and wind patterns across the network — reveals elevation effects and approaching weather systems.
🌡 Station Temperature Comparison
Current temperature at all nearby stations — see elevation and microclimate effects
💧 Station Pressure Network
Barometric pressure at each station — gradients indicate weather fronts
💨 Station Wind Comparison
Wind speed and gusts across all stations — see where it's windiest
👁 Station Visibility
Visibility readings — low values mean fog, haze, or precipitation
🌡 Elevation vs Temperature
Scatter plot — temperature drops ~3.5°F per 1000ft of elevation gain (lapse rate)
📊 Ensemble Forecast Intelligence
Deep analysis of how our 8-model ensemble makes its predictions. See where models agree (high confidence) and where they diverge (uncertainty). This is the engine's brain.
🌡 Ensemble Temperature Spread
Shaded band showing min-to-max model range with ensemble average — wide band = uncertainty
⚡ Thunderstorm Probability
Model-voted thunderstorm probability per day — from weathercode voting + CAPE
❄ Snow Stick Probability
Will snow accumulate on the ground? Based on ground temp, air temp, and precipitation type
🌡 Freeze/Thaw Cycles
Days when temperature crosses 32°F — critical for construction, concrete curing, frost heave
