Weather

1. Choose Maps ▸ Weather.
2. Type a peak, township or county name in the left search box and click a result; the last place you viewed is remembered.
3. Or pick a track under “View from a track or route”: the app uses its start point to find the nearest township, and a forecast peak within 10 km, and selects the nearest one.

• Current summary: weather icon, temperature, apparent temperature, rain chance, wind and humidity.
• Warnings: heavy rain, strong wind, low temperature and other bulletins currently issued for the county; expand one for the full text. For a peak the nearest county is used.
• Temperature and rain charts: temperature (solid) and apparent temperature (dashed), and the 3-hourly chance of rain.
• Period table: weather, temperature range, rain chance and wind for each period.
• Sunrise and sunset, calculated for the place.
• Township forecasts can switch between 3 days and 1 week; peak forecasts are always 3 days and cover the 151 peaks in CWA's mountain forecast.

Shows the 4 nearest weather stations within 40 km of the place (updated every 10 minutes): temperature, today's high and low, humidity, wind, gusts, pressure and UV, with each station's elevation and distance. Below are the 8 nearest rain gauges within 25 km with the 10-minute, 1-, 3- and 24-hour totals in millimeters.

“Heavy” and “Extreme” follow CWA's definitions (heavy: 40 mm in 1 hour or 80 mm in 24 hours; extreme: 100 mm in 3 hours or 200 mm in 24 hours). “Light” and “Moderate” are split at 5 mm per hour, a rough grade defined by this app. Stations without data are not listed.

Shows CWA's composite radar reflectivity chart (Taiwan and nearby seas, updated every 10 minutes), with a red pin at the place you chose. Colors show echo strength (dBZ); warmer colors mean heavier rain.

Lists every tropical cyclone CWA is tracking in the western North Pacific and South China Sea: intensity (tropical storm, typhoon, strong typhoon), maximum wind and Beaufort force, gusts, central pressure, heading and speed, the radius of force-7 winds, and the approximate distance from your chosen place. In the track chart the solid line is the past track and the dashed line is the forecast; the table lists position and intensity at each forecast time.

When there are none it says “No tropical cyclones right now”. Most storms are far from Taiwan; whether sea or land warnings are issued is announced by CWA.

• Source: CWA open data (Open Government Data License, version 1). Every screen shows the source and when the data was fetched.
• Internet required: without a connection the last data fetched is shown; data older than 3 hours is labelled as old offline data.
• Refreshing: click Refresh at the top right. Forecasts update about every 30 minutes; observations and radar every 5 to 10 minutes.
• A Trip Brief can also include a weather page.