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December 17, 2013
SACRAMENTO, Calif. (AP) – With California experiencing a second straight dry year, water agencies are turning to cloud seeding to help pad the state’s snowpack.
Cloud seeding involves spraying fine particles of silver iodide into a cloud system. Under the right conditions, the silver iodide causes water droplets in the clouds to form ice crystals that grow larger and turn into snowflakes. The goal is to increase the amount of precipitation that would otherwise fall.
The cloud-seeding push comes as the state goes through a dry spell. San Francisco’s 3.95-inch rainfall total so far this year is the lowest precipitation total in the city between Jan. 1 and Nov. 7 since record keeping started 164 years ago, the San Francisco Chronicle reported.
The previous record dry year was in 1976, when 5.57 inches of rain fell in San Francisco over the 311 days between Jan. 1 and Nov. 7. Meteorologists use San Francisco as a benchmark because it has the longest consecutive rainfall record in the state, going back to 1849-50.
“It’s going to be reflective of what we would expect throughout the Bay Area,” Benjamin said. “It’s probably safe to assume that the other areas are close to the lowest if they aren’t at the lowest.”
“We’ve never had any year dryer through October,” said Null, adding that there is no reason to get panicky with two months left in the year. Making predictions based on rainfall through October is, he said, “like giving the final score of the Giants game after eight innings.”