Rain is gratifying at the beginning of the rainy season. We all know that it has potential to become excessive later in the season, but we are not yet concerned with flooding or mudslides. After a typically long and dry summer, we enjoy it while we can. A storm that finished earlier yesterday was relatively minor, but was nonetheless the first significant storm of this new rainy season of 2023 and 2024. Only minor drizzle preceded it.

The beginning of the rainy season is also the end of the fire season. Forest fires become less likely as the forests become more saturated through the season. However, rain also sustains growth of vegetation that will become combustible during the following fire season, especially if the weather becomes unusually warm and arid by then. Unfortunately, this is the natural pattern of the climate here. Fire is a major component of local ecosystems.

Three years ago, the CZU Fire was the most destructive forest fire within documented history of this region. Larger fires likely occurred prior to documented history, but burned forests that expect to occasionally burn, without damage to unnatural infrastructure that did not exist at that time. Prehistoric fires were likely less common than modern fires, but involved much larger areas. They also likely burned faster and less violently. Modern forest fires involve more fuel because of regeneration of hardwood species after clear cut redwood harvesting a century ago. That is why so many coastal redwoods that survived several fires during their long lives succumbed to the CZU Fire.

Much of the marginal area of the CZU Fire is regenerating efficiently enough to eliminate evidence that it burned so recently. The scenery of areas that burned more severely remind us why we are grateful for the beginning of the rainy season.