How to read a thunderstorm radar

Start with the timestamp

A radar image is a snapshot, not a promise about the next few minutes. Read the time printed inside the map. If an animation is running, check whether its frames show past observations or a forecast. Reloading this page does not make old provider data current.

Rain radar is not lightning detection

Rain radar measures echoes from precipitation. Strong colours can highlight heavier precipitation, but the colour scale differs between providers. A coloured patch alone does not confirm lightning, hail at ground level or a tornado. Read the legend inside the selected map.

Watch a sequence, not one frame

An animation helps you follow how an area of precipitation develops and moves. A cell can strengthen, weaken, split or form nearby. Extending its previous movement in a straight line is not a reliable personal warning.

Use the right companion map

Lightning detection helps identify electrical activity. Satellite imagery gives a wider view of cloud systems, including where ground-based radar is sparse. Use your national weather service for the forecast and official warnings.

When the map is empty

A blank or quiet map can mean no returns, missing coverage, delayed data or a connection problem. Check the timestamp, reload or select another layer. Satellite imagery is a cloud view, not a replacement rain measurement. Use official forecasts and warnings for safety decisions.

PUT IT INTO PRACTICE

Read the map layers