| A front moving faster than 50 knots |
| A boundary between two different air masses where neither is strong enough to replace the other, resulting in very little movement |
| A thunderstorm that stays in one place |
| A solid wall of fog |
New: Boost Your Preparation!
On our site, you'll now find our new PRO Simulation Panel! Here are some of the exclusive benefits you get by unlocking it:
You can still continue with the free version, which gives you access to 75% of the questions with a limit of 3 simulations every 2 hours.
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...and much more!
📱 Or discover the Apps to study offline too