Cool, clear, and calm conditions favor the formation of fog by radiation cooling.
hurricane
artharidas
Usually warm conditions.
The eye of a hurricane is calm and often relatively clear of clouds.
No. It is not uncommon for conditions to become unusually calm before a tornado strikes.
psychopathology
During calm, clear weatherwith light winds
Because that's what volcanoes do. If the conditions deep down in the Earth are calm, then nothing happens at the surface. If the conditions deep down are unsettled, then you get volcanic activity on top. It's a bit like weather, only slower. Some days are calm, others are stormy.
During calm, clear weather with light winds
Areas of high pressure are calm, but low pressures signal stormy conditions.
The tide would have to be out, the weather calm and the day nice and sunny.