Pascal Barometer vs Your Weather Window

Track atmospheric pressure and predict weather changes using your device's built-in barometer. Pascal transforms your iPhone and Apple Watch into precision barometric instruments. Monitor pressure trends, receive storm warnings, and get weather predictions — all computed on-device with no internet required. FEATURES • Real-time pressure monitoring with 12-hour trend charts • On-device weather forecasting using the Zambretti algorithm • Storm alerts via push notifications • Live Activities showing pressure on Lock Screen and Dynamic Island • Flight mode with cabin altitude tracking • iOS widgets (small, medium, large) and Apple Watch complications • Hybrid calibration system for accurate readings PRIVACY FIRST All data stays on your device. No accounts, no cloud sync, no tracking. Location is used only for GPS altitude calibration and is never stored. TECHNICAL Pascal uses Apple's Core Motion framework to access the barometric sensor, delivering sub-Pascal resolution. The hybrid calibration system combines GPS altitude with relative altitude tracking to filter out elevation changes and surface true weather signals.

Step aboard for a different kind of weather forecast, one that helps you decide when to go. If you’ve ever found yourself refreshing forecasts over and over, the problem isn’t a lack of data. It’s turning that data into a simple plan. Stop interpreting charts and conditions. You don’t need a meteorology degree, just focus on when you want to go. This is where your weather window comes in. Choose an Outdoor Guide to keep an eye on the conditions for you. They track the changes, so you don’t have to. You’re not given more charts, you’re given clear direction. Your Guide shows you: • Should you GO or NO GO? Clear decisions for every outing. • The best weather window across the next 8 days. • Where the good opportunities are, calm stretches, dry windows, and stable periods before things turn. Whether you need a short break before the wind picks up, a calm stretch early in the morning, or a stable period to get plans done, your Guide finds the parts of the day that actually work. --- Built for Marine & Outdoor Life Weather Window is your outdoor weather planner, built for boaters, anglers, and anyone who plans life around the wind, tides, and sky. Boating & Marine Find safe weather windows to head out. Avoid rough or changing conditions. Plan around wind, tide, and marine forecast data so you leave when things are stable. Fishing Focus on the hours that matter most. Work with the light, wind, and conditions to make the most of short opportunities. Beach Days Pick calmer, more comfortable times. Avoid harsh sun and messy wind with an easy beach forecast built into your plan. Picnics & Outdoor Gatherings Plan around steady, reliable weather. Reduce the chance of disruption with clear GO / NO‑GO guidance. --- Plan Further with Extended Watch Free Passage • 1‑day watch • Simple GO / NO‑GO decision Extended Watch (Subscription) • 8‑day weather planner, see the full week ahead • Clear GO / NO‑GO decisions for every day • Access to all Guides Stop guessing. Start planning. Download your Weather Window Guide. Subscription Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/