Tag Archives: hydrology

California Weather Blog: After another extraordinary mid-winter dry spell, major atmospheric river to soak NorCal later this week

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From Daniel Swain at the California Weather Blog: “California has experienced some serious “weather whiplash” over the past several months. Extremely dry conditions heading into the early fall months gave way to a relatively brief ~2 week period of extremely heavy precipitation throughout much of coastal Northern California in early December, shattering local calendar date rainfall records in many places […]

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Michael Anderson, State Climatologist: Climate, Drought, and Change

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The state climatologist discusses the current drought and the signs of climate change. Is the current drought a harbinger of the future? With the winter season once again seemingly passing California by, officials are bracing for a fourth year of drought.  Earlier this month, the Public Policy Institute of California held a half-day conference in Sacramento focusing on how the […]

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California Weather Blog: A new year, a new ridge: dry and warm conditions return to California, but how does the present pattern compare to last year’s?

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From the California Weather Blog: Weather conditions over the past two months have varied wildly throughout California.Extremely heavy precipitation and unusually warm conditions in early December in the northern/central coastal regions gave way to very cold and mostly dry conditions around the new year (though not dry enough to preclude some remarkable low elevation snowfall in the lower hills of […]

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Water supply index forecast for January 1, 2015

DWR?s Frank Gehrke of California?s Snow Surveys performs snow survey with California Legislative fellows Toni Lee and Karen Morrison.

From the Department of Water Resources: A Water Year 2015 Water Supply Index (WSI) forecast for conditions as of January 1, 2015 is posted at http://cdec.water.ca.gov/cgi-progs/iodir/WSI.2015. This WSI forecast is based on the precipitation and flows through December 2014 and can be summarized as follows: Sacramento River Unimpaired Runoff Water Year Forecast(50 percent exceedance) 17.1 MAF(94 percent of average) Sacramento […]

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Survey Finds More Snow in Mountains, but Water Content Is Still Far Below Average for Date

Snow Survey

From the Department of Water Resources: The first manual snow survey of the Sierra snowpack this winter found more snow than last year at this time, but the snow water equivalent as measured statewide remains far below average for this date. The Department of Water Resources (DWR) conducted the survey today about 90 miles east of Sacramento on a plot […]

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California Weather Blog: Windy and cold weather on the way, with low elevation snow possible in SoCal, then a dry and cold start to the new year

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From the California Weather Blog: “After an extremely wet December across much of Northern California, the latter half of the month has been quite dry.     Precipitation during the first few days of the month was so significant, however, that despite an ongoing short-term dry spell, December 2014 will still go down in the record books as among the wettest […]

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Satellites, river stage graphs, rainfall maps, atmospheric rivers, and more: Internet resources for watching the storm and waterways


Here are some internet resources where you can find information on weather conditions, river flows, and reservoirs that might be useful for watching the storm and its impacts from your computer. If you have an internet resource that you think would be a useful addition to this page, please send me an email. Be safe out there! For weather and […]

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California Weather Blog: Powerful, potentially damaging storm to bring very heavy rainfall and high winds to Northern California

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From Daniel Swain at the California Weather Blog: Very strong storm–perhaps strongest since 2008–will arrive in California late Wednesday The numerical weather models are now in strong agreement that a powerful Pacific winter storm will slam Northern California later this week, bringing very heavy precipitation and very strong winds. In many ways the upcoming event is a textbook major storm […]

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Water Supply Index (WSI) forecast for December 1, 2014


From the Department of Water Resources: Welcome to the 2015 Water Year season of water supply forecasting!  The first water supply forecast has been completed. Forecast Summary: A Water Year 2015 Water Supply Index (WSI) forecast for conditions as of December 1, 2014 is posted at http://cdec.water.ca.gov/cgi-progs/iodir/WSI.2015. The accretions forecast will be sent at a later time. This WSI forecast […]

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2014-15 Winter Season Outlook


When it comes to the upcoming winter season, there are many questions.  Will it be wet or dry?  What about El Nino? and what will it take to end the drought?  Cindy Matthews, Senior Service Hydrologist with the National Weather Service/NOAA, answered these questions in her presentation at the November Delta Stewardship Council meeting on the long range forecast for […]

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