Wednesday January 10th… Dear Diary. The main purpose of this ongoing post will be to track United States extreme or record temperatures related to climate change. I’ll refer to extreme temperatures as ETs (not extraterrestrials)😊. Here is today’s climate change related topic:
Fire, Flood and Mud Part 2
Since areas in and near the Thomas Fire burn scar were devastated so badly yesterday from heavy rainfall, I’m going to post more information on this event. First, my friend Bob Henson of Weather Underground posted his take, which is more technical than mine, showing more science as to why this most recent California tragedy occurred:
Quoting from the article:
How fire begets flood
NASA offers a concise explanation as to why burned hillsides are such a flood risk. Not only do the fires consume leaves and other ground cover that would otherwise absorb rainfall, but they can also inhibit the water-absorbing capacity of the soil itself. As explained by NASA:
“Plants and trees have numerous protective chemicals with which they coat their leaves to prevent water loss. Many of these substances are similar to wax. Vaporized by the heat from fires, these substances disperse into the air and then congeal over the soil surface when the fire begins to cool. Like the wax on your car, these substances coat the soil, causing water to bead up and run off quickly. In general, the greater the fire intensity and the longer the fire’s residence time, the more hydrophobic the soil becomes.” The Thomas Fire was an exceptionally intense and long-lasting fire, as noted by California Weather Blog.
The fatal mudslide in Montecito was actually south (downhill) from the area scorched by the Thomas Fire, according to Santa Barbara County Fire Department spokesman Mike Eliason. However, any rainfall and fire debris flowing off the burned areas upstream would have headed down the hillside toward Montecito. The NWS office in Riverton, WY, cautions: “A good rule of thumb is: ‘If you can look uphill from where you are and see a burnt-out area, you are at risk.”
Unfortunately the death toll from this even has risen to 15:
– 15 people dead
– 7,000 people evacuated
– 300 people stuck in their homes in Montecito’s Romero Canyon neighborhood
For more: http://lat.ms/2CMpyZE
Here are more social media pictures, videos and information about this “Montecito Mud Storm.”
— Gadi Schwartz (@GadiNBC) January 10, 2018
Believe it or not this heavy, intense rain event occurred during an overall dry pattern this winter due to a break in the dipole of a ridge aloft over the western U.S. and a trough in the East. Also, Southern California typically has a dry winter during a La Nina:
Short bursts of heavy, intense precipitation are what can be expected in association with climate change in semi-arid locations around the globe like Southern California. At least there is a silver lining here after this dark cloud has passed. Dry, warm weather will allow residents to recover.
Oh, and here is some more good news:
That’s enough water to supply 33,600 residents.
As far as those ETs go, there are good indications that ahead of the next arctic front there will be record warmth in the Midwest and Northeast tomorrow and Friday:
Thursday highs from NWS:
I’ll be adding more relevant information should it cross my radar later today.
The Climate Guy