Weather guides

How to Read a Weather Radar

Learn what radar colors mean, how radar differs from satellite, what it cannot show, and how to combine radar with the forecast to plan the next few hours.

Hurricane season in Puerto Rico

When hurricane season runs in Puerto Rico, what María and Fiona left behind, and how to prepare before a cyclone.

Rainy and dry season in Puerto Rico

How the dry and rainy seasons split the year in Puerto Rico and why the north and El Yunque are far wetter than the south.

Tropical waves and troughs in Puerto Rico

What tropical waves and troughs are, and why they cause flash flooding in Puerto Rico even without a hurricane.

Saharan dust in Puerto Rico

What the Saharan dust cloud that reaches Puerto Rico each summer is, how it affects the sky and the air, and why it suppresses hurricanes.

Heat, humidity and the UV index in Puerto Rico

Why heat feels stronger in Puerto Rico because of humidity and how to protect yourself from the tropical sun all year.

How a Weather Forecast Is Made

Find out how a weather forecast is built: the observations, numerical models such as ECMWF, GFS and ICON, why forecasts carry uncertainty, and how often the data is updated.

Feels-like temperature: why it differs from the thermometer

What feels-like temperature is, how it differs from air temperature, how wind and humidity change what you sense, and why it matters for your health and clothing.

Humidity and Comfort: How It Affects Your Body

The difference between relative and absolute humidity, what dew point is, why high humidity feels hotter and low humidity dries you out, and the comfortable ranges.

Air Quality and the AQI Index

What the air quality index (AQI) means, the main pollutants such as PM2.5, PM10, O₃ and NO₂, the health categories, and how to reduce your exposure.