Quote:
Originally Posted by Klazu
Someone posted a BC drought map on the Canada section. I was surprised that Interior has lower fire hazard than Lower Mainland which is the worst drought are together with Vancouver Island right now.
I suppose in Interior they have been getting at least some rain despite the high temperatures.
|
I have long studied climate and weather in BC, time for some information.
While June, July, August, and September are the driest months of the year along the south coast of BC, June is actually the wettest month of the year for most of the southern interior.
This is because of convection cell storms. June is warm (and sometimes hot, such as this year) in the BC interior, but it is not as stable as July and August, therefore there is a lot more convection activity.
Kamloops this June actually may have had the most rain of anywhere in the province (82.5mm, much higher than their average 37.4) thanks to 3 weak disturbances that all spawned major thunderstorms. West of Kamloops has remained much drier (Ashcroft recorded 24.2mm, Lytton 12.9), and south of Vernon the Okanagan has had almost spot on average rainfall (30 to 40mm). The heart of the interior forest fire season does not start until mid July or August. That being said, the interior is a dry location even during the wettest of times, therefore forest fires in June are not uncommon, some forest fire seasons start early, some start late.
For contrast Victoria has only had 6.6mm of rain since May 1st!
Now, I am not here to debate climate change (climate change is happening, and much of it is man made, but not every single weather event is due to climate change, and even with all the man made aspects, there is still some natural elements at play. Hence I am against extreme measures being proposed by some, such as purposely dimming the atmosphere with suspended particles to reflect sunlight in an attempt to mitigate C02, such practices will likely just fuck things up even more).
As for forest fires, they are very very very natural in BC. Climate change is not causing more forest fires! I based my thesis at SFU on the damage forest fire supression has done to the BC ecosystem. On an average year only 10% of the pre-fire supression historical norm of land area burns in BC. Even the great 2003 Okanagan Mountain year only saw 50% of the historical average burn...
Before fire supression any given spot in the bunchgrass zone of the Okanagan / Thompson would burn every 5 to 10 years. The lower Ponderosa Pine and Douglas Fir forests every 10 to 20 years. The vast majority of these areas have not burned now for 80 or 90 years! The forests are becoming crowded with sick trees and countless saplings. This has chocked the once open parkland nature of those forests. It has also lead to "forest creep" where we are actually losing our grasslands to forests. The next time you are in the interior just look at the ratio of young saplings to mature trees, there are way, way, way too many saplings! (This crowded mono population of trees was the key reason to the pine beettle problem, not warmer winters, since the pine beettle itself lives in much warmer climates all the way to Mexico, yet the epidemic started in its coldest location where forest fires are much easier to control...).
Think of it this way, the Okanagan Mountain is a mix of Ponderosa Pine and Douglas Fir parkland forests, which should burn once every 10 to 20 years. The fire in 2003 was the best thing to happen there and now that mountain is more healthy than it was before. That fire was super intense (because so much fuel built up for so many decades) but now it has been equalized. That was in 2003, therefore on average without fire supression that same mountain should burn again before 2023... (of course this time, such a fire would be a more traditional surface fire burning out saplings and dead branches) creating a healthy environment for the more mature trees.
Sadly the media always likes to pain forest fires as evil and some crazy event only happening because of climate change, when in reality that is the most lazy sensationalist reporting possible.
ahhh, done, I hope some of you actually read all that, and please feel free to ask me any questions you have on BC biogeoclimate zones and the cylce of fire in the interior.