California Nevada Climate Applications Program (CNAP)

Climate information for California and Nevada decision makers
Funded by the NOAA Office of Global Programs
CNAP is a NOAA/OGP Regional Integrated Sciences and Assessments (RISA) member

ARkStorm@Tahoe -- Preparing
for a major winter storm

Read the latest on the CNAP BLOG

(updated 5 February 2015)

Upcoming Conferences
Past Conferences

CNAP Collaborating sites Western Regional Climate Center
Southwest Climate Science Center
Climate Assessment for the Southwest
Center for Western Weather and Water Extremes (CW3E)
Climate Impacts Research Consortium
Western Water Assessment


California Precipitation
CNAP and partners from CW3E, the Southwest Climate Science Center and the California Department of Water Resources have compiled a 2-page summary exploring features of California's precipitation. The focus of this summary is the seasonality and variability of precipitation in the state, with an emphasis on the link between large storms and the seasonal total precipitation.
(Click above for 2-page handout)

The Drought of 2014: Record Hot, Record Dry
CNAP Observations, No. 2

(Click above image for full report)
CNAP explores the 2014 drought in the latest release of CNAP Observations. The reason for the current drought, comparison to previous droughts, the link between this drought and the wildfire forecast and the key role of heavy storms are examined in this publication.
Please click here for CNAP Observations

Indicators of Climate Change in California

(Click above image for full report)

Click here for the California Office of Environmental Health Hazard Assessment (OEHHA) web page which has links to a press release and a summary of the report

The California Environmental Protection Agency has released an updated and expanded edition of its 2009 report examining 36 indicators of climate change and their effects on California. CNAP researchers contributed extensively to the indicators identified in this easy-to-digest report. Each indicator is described in terms of what it is showing and why it is important. Factors influencing the indicator are explored as well as the data characteristics that contribute to the indicator.

About CNAP

Drought continues over California and Nevada
Quick links to the latest drought related information

Click here for PowerPoint presentation of images in above loop
After a wet December hopes were dashed for drought relief with a January that gave little to no precipitation (the first time on record San Francisco had no precipitation during the month of January). Heading into what appears to be another dry winter with record and near record low snow levels the strong atmospheric river storm heading into northern California on February 5th is welcome. However this storm is not expected to add significantly to the scant snow pack and with longer-range models rebuilding the ridge off the west coast worries about another extremely dry winter are well-founded. Find more information on our western drought web page:

Great Basin Climate Forum

The Great Basin Weather and Climate Dashboard

Assessment of Climate Change in the Southwest United States
NEW! Report now available in Spanish - please click here
CNAP researchers have been contributed to a landmark study investigating climate and its effects on the people and landscapes of the US Southwest. The results of this study have been compiled into a book (cover to the left) as one of nine regional technical inputs to the National Climate Assessment. The following chapters were authored by CNAP researchers:

CNAP/CCCC Research

Our Changing Climate 2012
Scoping meetings are in progress for the preparation of the next version of this report

(Click here for full report)
The summary of the Third Assessment comprehensive California Changing Climate report was released July 31, 2012. This summary highlights findings from 24 studies that focused on local and statewide vulnerabilities, considering opportunities for action to reduce impacts. These studies find California will continue to get hotter, drier and experience accelerated rising sea levels.

Recent webcam image of the Merced River at Happy Isles (USGS)
Happy Isles (Merced River) Webcam
USGS has opened a Happy Isles gage house in Yosemite Valley. CNAP researchers Mike Dettinger and Dan Cayan fought diligently for this new site. The site features a webcam showing the station and the merced River as it enters Yosemite Valley. The old gage house (circa 1915) can be seen in the background on daytime images.

For more information from this site including the latest gage readings and snaps/animations of recent days please click below:

Scripps Hydroclimate Weather Observations
San Diego Forecast
California/Nevada Current Radar
Western Infrared Image
Current southern California Santa Ana Conditions are indicated by the color of the button to the right
RED = YES Meteorological parameters indicate Santa Ana conditions are occurring
GREEN = NO Meteorological parameters indicate Santa Ana conditions are NOT occurring
Click here for more information
Western Regional Climate Center
IRI Forecasts
Climate Prediction Center
National Weather Service - San Diego
Data Resources
Reading Room

Recent articles of interest to climate and climate change
PACLIM 2013 scheduled for 3-6 March

MTNCLIM 2012 scheduled for 1-4 October in Estes Park, Colorado

Forecast Resources

Mosquitos! A good catch!
Read more about CNAP/CCCC research linking mosquito abundance to climate
Thank you for visiting the California Nevada Applications Program/California Climate Change Center website!

CNAP/CCCC is directed from the Climate Research Division, Scripps Institution of Oceanography
University of California - San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0224
Phone: (858) 534-4507; FAX: (858) 822-2028

Last update: 26 February 2015
Please direct any comments or questions to:
Mary Tyree

This website was prepared by Mary Tyree partially under award NA17RJ1231 from the National Oceanic and Atmospheric Administration, U.S. Department of Commerce. The statements, findings, conclusions, and recommendations are those of the authors and do not necessarily reflect the views of the National Oceanic and Atmospheric Administration or the Department of Commerce.

Folsom Dam; built 1955-1956
Read more about CNAP/CCCC project INFORM: Integrated Forecast and Management; increasing water-use efficiency for northern California reservoirs