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Global distribution of thunderstorms - Explanatory notes
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Thunderstorm web page features
When a station reported thunderstorm, a symbol would be shown on the world map on the front page. Symbols of different shapes and colours are used to indicate whether the observation was reported in the most recent synoptic hour or reported
6, 12, 18 or 24 hours earlier.
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reported at the latest synoptic hour;
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reported 6 hours earlier;
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reported 12 hours earlier;
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reported 18 hours earlier;
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reported 24 hours earlier.
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In the zoom-in maps, lightning icons are used to indicate the location of thunderstorm occurrence. Different types of thunderstorms are indicated by different icons:
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| Types of thunderstorm |
at latest synoptic hour |
6 hours earlier |
12 hours earlier |
18 hours earlier |
24 hours earlier |
| slight or moderate thunderstorm |
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| heavy thunderstorm |
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| thunderstorm with hail |
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| thunderstorm with dust-storm or sand-storm |
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| heavy thunderstorm with hail |
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Clicking or putting the mouse cursor over a thunderstorm icon will open a window
showing the reporting station(s) around that location.
List of stations reporting thunderstorms in the past 24 hours, the corresponding country and the location of the stations in latitude and longitude units, and the type of thunderstorm could be viewed by clicking on the corresponding links below the map.
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Source of data
The weather observations are extracted from Members' SYNOP reports submitted to WMO through the GTS.
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