If thunderstorms are present around the destination airport, what is the appropriate action if the ceiling is forecasted to be 200ft?

When thunderstorms are present around the destination airport, especially with a forecasted ceiling of only 200 feet, diverting to an alternate airport is the most appropriate action. A ceiling of 200 feet indicates very low visibility conditions and significantly limited options for a safe approach and landing. Thunderstorms can exacerbate these conditions with turbulence, wind shear, and rapid changes in weather that can affect flight safety.

Diverting to an alternate airport allows for maintaining safety by ensuring there is a suitable landing option that is free from the adverse weather conditions caused by thunderstorms. It also provides the opportunity to reassess the situation, either waiting for conditions to improve or choosing a different destination where the weather is more stable.

While proceeding to the destination might initially seem feasible, it poses risk due to the severe weather and limited visibility. Continuing to fly at the current altitude does not address the underlying problem and can lead to dangerous situations. Reporting to air traffic control may be necessary, but it does not solve the critical issue of landing safely given the hazardous conditions. Thus, diverting to an alternate airport is the best choice.