A Scripps Center for Western Weather and Water Extremes report shows that more atmospheric rivers have made landfall over the U.S. West Coast in the first four months of Water Year 2021 compared to the previous period in 2020.
San Diego is experiencing one of the driest Februaries it has had in nearly 170 years due to weather patterns that are sending most winter storms into the Pacific Northwest and Northern California rather than allowing them to drop south, says the National Weather Service.
In 2014, as California was in the midst of one of the worst droughts in its recorded history, Julia Szinai was working for an electric utility. The worst years of the drought were still ahead, but the impacts of the dry spell on California’s energy system were already clear to Szinai. As water levels dropped, so too did hydropower generation—an energy gap that was filled by fossil fuels.
There’s an old saying that those who don’t remember history are destined to repeat it.
And that certainly holds true when it comes to securing water for this semi-arid place we call home. Those who have been around here since the early 1990s remember when we relied on a single Los Angeles-based water agency to meet almost all of our water needs — and we paid for it with traumatic supply cuts that crippled our economy.
Thankfully, three decades of regional investments have changed San Diego’s story for the better. Planning and investments by the San Diego County Water Authority and our 24 local retail member agencies have produced and will continue to ensure one of the most reliable water supplies in California.
A Scripps Center for Western Weather and Water Extremes report shows that more atmospheric rivers have made landfall over the U.S. West Coast in the first four months of Water Year 2021 compared to the previous period in 2020.
The four months of Water Year 2021 experienced a total of 35 landfalling ARs over the U.S. West Coast, six more than the first four months of Water Year 2020, according to the CW3E quarter year summary released February 11.
• The first four months of Water Year 2021 experienced a total of 35 landfalling ARs over the U.S. West Coast, 6 more than the first four months of Water Year 2020.
• Water Year 2021 also experienced more than twice as many strong or greater ARs (14) compared to Water Year 2020 (6).
• While Water Year 2021 saw more ARs in its first 4 months compared to Water Year 2020, a large majority of those ARs were
strongest over the Pacific Northwest (Oregon and Washington).
• The average landfall latitude thus far in Water Year 2021 was 45.9°N compared to 43.9°N during the first half of Water Year 2020.
• The lack of landfalling ARs over Southern California and Baja California has resulted in much drier conditions over the southwestern U.S. compared to WY 2020.
The four months of Water Year 2021 experienced a total of 35 landfalling ARs over the U.S. West Coast, six more than the first four months of Water Year 2020. Graphic: Center for Western Weather and Water Extremes
A partnership with the San Diego County Water Authority and the Scripps Institution of Oceanography at UC San Diego seeks to optimize water management to better predict atmospheric rivers before, during, and after those seasonal storms.
In August 2020, Scripps Center for Western Weather and Water Extremes (CW3E) launched the Water Affiliates Group, which brings together cutting-edge science and hands-on water industry experience to enhance reservoir operations in light of the changing climate. The Water Authority has a long-running alliance with Scripps and is among six founding water agencies statewide.
CW3E and its partners will share and support best practices in forecast-informed reservoir operations, increase research around atmospheric rivers and droughts, and develop strategies for mitigating flood risk and increasing water supply reliability.
The above image, from the EOS article, is a depiction of an atmospheric river, interacting with West Coast mountains and a midlatitude cyclone over the northeast Pacific on 5 February 2015. This image provides an example of approximate locations of associated tropical moisture exports and a warm conveyor belt (WCB). Graphic: Adapted from NOAA/ESRL Physical Sciences Division via CW3E
The Kern County Farm Bureau issued a “call to action” this week asking local growers and ranchers to participate in a series of upcoming meetings that will influence the role California’s agricultural lands will be expected to play, or continue to play, in fighting climate change. Besides asking members to speak up at a series of online meetings the state is hosting this month, the bureau is collecting data it hopes will illustrate local ag producers’ “climate-conscious nature” with an eye toward ensuring private industry will continue managing its property “on a voluntary basis,” bureau President John C. Moore III said by email.
There’s a race on in California, and each day matters: the precipitation during winter that fuels the snowpack in the Sierra Nevada and fills groundwater supplies has been slow to start, and faltering at best. Northern California remains stuck in one of the worst two-year rainfall deficits seen since the 1849 Gold Rush, increasing the risk of water restrictions and potentially setting up dangerous wildfire conditions next summer.
The California Energy Commission has awarded a $1.5 million contract to three University of California campuses, including UC San Diego, that will work in tandem to better simulate climate change scenarios that can be used by utilities and others to anticipate the effects.
The undersea power line would run south from San Luis Obispo County, hugging the California coast for 200 miles before making landfall in or near Los Angeles. It would be able to carry electricity from a fleet of offshore wind turbines, providing Southern California with clean power after sundown and helping to replace fossil-fueled generators.
Fewer planet-warming emissions, less risk of blackouts and no chance of igniting the wildfires sometimes sparked by traditional power lines: Those are the arguments for the $1.9-billion Pacific Transmission Expansion.
The Water News Network is San Diego County’s source for water news and information.
