Storm

Area
Creates (or dispels) a storm. Depending on ambient temperature and humidity, it may be a simple windstorm or include rain, snow or hail – the odd lightning bolt, too. This is particularly effective at sea. The spell is unpredictable in its effects (which is to say the GM decides what the storm does...).
The spell can also be used to dispel a storm; the effectiveness of the spell depends on the relative sizes of the affected area versus the natural storm’s full area.

Duration: 1 hour.
Base cost: 1/50 (minimum 1). Same cost to maintain.
Time to cast: 1 minute. An incipient storm will take about an hour to gather and reach full strength. Once the spell lapses, it may take a varying length of time to calm down – it may even keep going on its own for hours yet! A dispelled storm will also take about an hour to calm down.
Prerequisites: Rain and Hail

Item
Staff. Usable only by a mage.
Energy cost to create: 1,000.