Insolation - this is very important to know, seeing how it will come up in every topic of this event. Insolation is an abbreviation for incoming solar radiation (INcoming SOLar radiATION). As I said, it's very common in meteorology, sometimes common enough to the point where it is sometimes not defined enough.What are Semi-Permanent pressure cells and WHAT IS INSOLATION
Semi-permanent pressure cells - areas of low/high pressure patterns that vary in position and strength (sometimes disappearing altogether) depending on the time of the year. For example, the Aleutian Low covers much of the north Pacific Ocean in January. However, by the time July rolls around, it has been replaced by the Hawaiian High as the prevailing pressure pattern in the north Pacific. Semi-permanent pressure cells are important to local climates because they describe the most common pressure systems that are expected to occur in an area at a point in time, which can indicate the most likely weather patterns (e.g., if an area is under a semi-permanent cell of high pressure in the winter, you would expect the area to usually experience conditions associated with high pressure systems more than those associated with low pressure systems).