Indonesia volcanic ash and weather: what the second video adds
A second video companion looks at how ash, smoke and local rain create different hazards across Indonesia.
15 Sept 2026, 12:11 GMT+4Weather Explainers
Practical guides to the numbers and terms used in a forecast, written from primary documentation and reviewed before publication.
weather explainersFog and visibility: what a forecast can and cannot tell you
Fog can change over a short distance and a few minutes. Learn what visibility means, why different kinds of fog form and when to use official travel advice.
9 Sept 2026, 04:25 GMT+4
weather explainersHow to read air pressure and isobars on a weather map
A pressure number makes more sense when you compare it with nearby values, the isobar pattern and the system's direction of travel.
9 Sept 2026, 04:25 GMT+4
weather explainersDew point vs relative humidity: which number tells you more?
Relative humidity changes with temperature, while dew point gives a more direct view of how much moisture is in the air. Here is how to read both.
9 Sept 2026, 04:25 GMT+4
weather explainersWind speed, gusts and direction: a practical forecast guide
Average wind and peak gusts describe different parts of a changeable flow. Learn how they are measured and how to use both in a city forecast.
7 Sept 2026, 21:16 GMT+4
weather explainersHow to read the UV Index, even on a cloudy day
The UV Index measures expected ultraviolet exposure rather than warmth or brightness. Here is what its levels mean and why clouds can mislead.
7 Sept 2026, 21:16 GMT+4
weather explainersWhat does a 40% chance of rain actually mean?
Rain probability answers a narrower question than many forecasts make clear. Here is how to read the percentage alongside timing and expected amount.
7 Sept 2026, 21:16 GMT+4
weather explainersWhy local time changes what “today” means in a weather forecast
Berlin, Moscow, Tbilisi and New York can be on different dates at the same instant. Here is how local time, DST and UTC shape hourly and daily forecasts.
7 Sept 2026, 09:29 GMT+4weather explainersHow to read a city forecast without overreading it
A practical guide to model estimates, hourly values, daily ranges, timestamps and the difference between a forecast and an official warning.
7 Sept 2026, 09:29 GMT+4weather explainersForecast or official warning? Know which one you need
A city forecast supports everyday planning. An official warning communicates a hazard and public instructions. These are the official services for the first four cities.
7 Sept 2026, 09:29 GMT+4