Jim Johnstone



James A. Johnstone, Ph.D. (Berkeley, Geography 2008)                            
Climate Analyst
Visiting Scientist
Joint Institute for the Study of the Atmosphere and Ocean
Climate Impacts Group
University of Washington
NEW:  Fog updates for the 2010 summer season, Northern California

Quasi-biennial oscillation
in 500 hPa geopotential heights near Vancouver, BC appears to account for ongoing, persistent troughing over the US west coast during the spring of 2010.  The QB signal here was obtained as a fit to the Western US winter precipitation record, 1950-2007.  The recent anomaly is part of a strongly annular pattern in NH Z500 anomalies during the recent winter-spring.  Stay tuned for further updates of the QB cycle, discussed in a recent paper: 

Johnstone, J.A. 2010. A quasi-biennial signal in Western U.S. hydroclimate and its global
teleconnections. Climate Dynamics. Published online March 20, 2010
.



Daily northerly wind along the Oregon coast (45N, 125W from the NCEP Reanalysis)
The 31-day mean northerly wind  is at an all-time high (beginning 1949).  July had the most extreme N winds of any month on record.  This work is being continued at JISAO, University of Washington. Updates will be added weekly.




Announcements
    3/23/10: New article published in Climate Dynamics on quasi-biennial variability in Western US hydroclimate
        CD link            download pdf

    
Fog-redwood work to be featured at the American Museum of Natural History, NYC  March 20 - April 2

    UW spring quarter talks

    Article published in PNAS on Northern California summer fog and coast redwoods
        PNAS link        download pdf
    

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