Winter Science vs Avycast

WinterScience: Know the snow. Plan your day. The snow under your skis has a history. WinterScience brings together reconstructed mountain weather, our AI-driven Stratos ensemble forecast, and detailed snowpack simulations to help you understand how conditions developed and what may come next. RECONSTRUCTING WHAT HAPPENED We combine radar, weather-station observations, and model data to build a detailed picture of recent mountain weather. Follow when precipitation arrived, how snow levels changed, and the wind and temperature shifts that shaped the snow. This reconstructed history also supplies the weather that drives our snowpack models, connecting past storms to today's conditions. STRATOS: OUR AI-DRIVEN ENSEMBLE FORECAST WinterScience Stratos uses 50 ensemble members plus a control run to explore possible weather outcomes. Those different forecasts help describe the range of conditions ahead and where the model runs agree or differ. Follow rain, snow, temperature, wind, and snow levels at mountain elevations, and compare Stratos with other models including ECMWF, GFS, and HRRR. OVER 200,000 SNOWPACK MODELS We run over 200,000 snowpack simulations across the Western U.S. using SLF SNOWPACK. These physics-based models track individual snow layers as they settle, warm, cool, melt, and change over time. Reconstructed weather builds the recent snowpack; forecast weather extends it into the days ahead. Explore layer hardness, grain types, and density. Compare wind loading and modeled ski conditions at base, mid, and summit elevations across eight slope aspects. Inspect a snow profile or read a snow report to understand how the weather is changing the mountain's snow. FROM THE REGION TO YOUR MOUNTAIN Explore weather and snowpack on an interactive terrain map. Compare mountains, save favorites, follow a detailed weather timeline, and read regional outlooks. Move between recent history and future forecasts in a native app designed for iPhone and iPad. COVERAGE Coverage includes the Western U.S. FREE ACCESS AND MEMBERSHIP Recent weather history and current and recent snowpack are available free. Eligible accounts receive a seven-day forecast trial. Annual membership provides continued access to future weather and snowpack forecasts and regional outlooks. Your membership works on iOS and the web when you sign in to the same WinterScience account. Subscriptions purchased in the app are billed through your Apple Account and renew automatically unless canceled. Manage or cancel renewal in your Apple Account subscription settings. Privacy Policy: https://winterscience.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Avycast brings together the official avalanche bulletins of around 30 warning services in 21 countries across four continents, presented in a single, consistent interface and translated into 12 languages. Built for backcountry skiers, splitboarders, alpinists, ski tourers, and mountain guides who plan trips across borders — from the Alps to the Southern Alps, from Hokkaido to the Rockies. KEY FEATURES • Daily bulletins from official warning services — EAWS member services, SAIS (Scotland), Avalanche Canada, US avalanche centers, JAN (Japan Avalanche Network), Niseko Avalanche Institute, NZAA (New Zealand), Avalanchas.com.ar (Argentina), and Gudauri (Georgia) • 12 languages — English, German, Spanish, French, Italian, Japanese, Norwegian, Swedish, Czech, Romanian, Russian, Georgian • Danger rating by elevation band — Alpine, Treeline, Below Treeline • Active avalanche problems with size, frequency, and stability details • The full forecast text from the issuing service — highlights, avalanche activity, and snowpack analysis • Slope Risk Evaluator — combines the current danger rating with terrain exposure class (ATES) to suggest whether a planned tour is "Normal Caution", "Extra Caution", or "Not Recommended", based on published avalanche research (NAPADS, CMAH) • Favorites — save the regions you travel in for one-tap access • Original bulletin viewer — read the source bulletin in its native format at any time • Location-based — automatically finds the nearest region with an active bulletin • Faithful to the source — we never rewrite or "improve" danger ratings, and the translation follows the forecaster's own words instead of summarizing them COVERAGE (21 COUNTRIES) Europe — Italy, France, Switzerland, Austria, Germany (Bavaria), Slovenia, Spain (including the Catalan Pyrenees), Andorra, Norway, Sweden, Finland, Czech Republic, Slovakia, Romania, Great Britain (Scottish Highlands) Caucasus — Georgia (Gudauri) Asia — Japan (JAN regions and Niseko) North America — Canada, United States South America — Argentina (Bariloche, El Chaltén, San Martín de los Andes) Oceania — New Zealand (13 NZAA regions) More regions are added regularly. Every region also has a free forecast page on the web at avycast.app — one page per region, no account needed. DATA SOURCES All bulletins are fetched directly from the issuing avalanche warning service. Translations are generated automatically for your convenience — for critical decisions, always consult the original source bulletin (accessible via the "View original" button on every screen). IMPORTANT SAFETY NOTICE This app provides decision support based on published avalanche research. It is NOT a substitute for professional judgment, formal avalanche education, or local expertise. Always: — Read the original bulletin — Travel with trained partners — Carry a transceiver, shovel, and probe — Know how to use them Avalanche terrain is inherently hazardous. No app, bulletin, or tool can make it safe — only you can make informed decisions. SUBSCRIPTION Free: the full bulletin for your region, with one region change per day. Premium: unlimited region switching and favorites — monthly or annual, with the annual plan costing less than twelve monthly ones and its first 7 days free. Auto-renewing, cancel anytime in Settings > Apple Account > Subscriptions. Prices are localized per region and shown in the App Store before you subscribe. ——— Terms of Use (EULA): https://avycast.app/terms.html Privacy Policy: https://avycast.app/privacy.html