California Nevada Climate Applications Program (CNAP)

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

What can we learn from the last 4 years of drought?
Great Basin Climate Forum: April 8, 2015
Read the latest on the CNAP BLOG

(updated 30 March 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


Drought in Southern California
CNAP and partners from NIDIS (National Integrated Drought Information System), the Southwest Climate Science Center and the California Department of Water Resources have compiled a 2-page summary exploring drought in southern California. The last four years of drought conditions, links to climate change, California's year-to-year precipitation variability and dependence on large storms, and southern California's water supply are featured in this summay.
(Click above for 2-page handout)

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

Post-doc opportunity
Post-doctoral fellow opportunity on California and Sierra Nevada drought
Host: Scripps Institution of Oceanography
Deadline: Available immediately, applications will be received until filled
Please click here for more information

Drought continues over California and Nevada
Don't Count on El Niño to End the Drought
July 9, 2015: Public Policy Institute of California Blog Post by CNAP reseacher Dan Cayan and Jeffrey Mount
Please click here for the post
Quick links to the latest drought related information

Click here for PowerPoint presentation of images in above loop
The latest drought monitor shows dought conditions continue to be extreme to exceptional over 94% of California and 87% of Nevada. The total precipitation over the last three years is at or below 70% of normal over much of California with some areas reporting less than half the normal precipitation. 2014-15 is not going to be the driest year for the northern Sierra 8-station index but does rank below normal and between the two most recent dry years (2012-13 and 2013-14). It has also been warm with maximum and minimum annual (May 2014 - May 2015) temperatures statewide the warmest recorded (since 1895) over the extreme west and near record warmest for much of the west. The snowpack has dwindled with little left to contribute to runoff or streamflow. From the May bulletin all water conditions (snowpack, precipitation, runoff and reservoir storage) are below normal for all years 2012-2015. Sea surface temperatures over the tropical Pacific, especially to the east, continue to be warm and an El Nino advisory has been issued with the likelihood of an El Nino event at 80-90% for 2015. There is quite a bit of spread amongst the models so it is uncertain how strong this event will be. The NOAA 3-month outlook shows probability of warm conditions persisting across the west through August.

Great Basin Climate Forum Series: Past and Present

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 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 2015 ran 8-11 March

MTNCLIM 2014 ran 15-18 September in Midway, Utah

Forecast Resources

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

CNAP 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: 14 July 2015
Please direct any comments or questions to:

This website was prepared by CNAP 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 project INFORM: Integrated Forecast and Management; increasing water-use efficiency for northern California reservoirs