Watch, then read the lesson.
Every lesson is also on YouTube: Sky Science playlists on YouTube.
2:34
How to Read Weather Radar
Decode radar colours, beam height, storm motion and future frames so a weather map tells you more than where the brightest patch is.
1:59
How Live Radar Reaches Your Phone
Follow a national radar scan from millions of values through verified tiles, nearby caches and GPU motion into one smooth loop.
2:35
What AQI and PM2.5 Mean
Understand fine particles, the uneven US AQI scale and why smoke overhead can tell a different story from the air near the ground.
2:18
How Rain Nowcasting Works
Why a forecast can say rain starts in twelve minutes, why that countdown can jump, and how to use a next-hour forecast sensibly.
2:33
Why Weather Apps Disagree
Two rain chances can reveal uncertainty. Learn how imperfect starting data, forecast choices and probability definitions create the gap.
The forecast that explains itself.
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More from Forecast Bar
Learn: two-minute explainers
Short videos on the sky and the weather, each with the lesson written out.
Read the Sky
How to know, hours ahead, whether tonight's sky is worth going outside for: the clouds that make a sunset, what the aurora numbers really mean, and how darkness, the Moon and clouds decide a meteor shower.
Storm Science
Storm cells and whether one will hit you, hail size and the storm report, and what Slight, Enhanced and Moderate risk mean on a severe weather outlook.