Jim Johnstone
James A. Johnstone, Ph.D. (Berkeley, Geography 2008) CV Climate Analyst Research Postdoctoral Research Associate Press coverage
Joint Institute for the Study of the Atmosphere and Ocean (JISAO) Images
University of Washington Links
Announcements
NEW: 2010 summer fog totals for the U.S. Pacific coast
Daily fog for the 2010 summer: Northern California Pacific NW
Seattle Times: Long, hot summer eludes the cloud-shrouded West Coast
New article published online 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
Climate Updates
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)
Since the start of September, northerly summer winds have gone a rapid reversal, with the 7-day mean crossing into southerly mean conditions for the first time since June. The 31-day mean remains slightly above average (+0.09 sigma). The summer wind season was remarkably peaked, with record northerly 31-day winds occurring in the middle of a short season.
NEW: 2010 summer fog totals for the U.S. Pacific coast
Daily fog for the 2010 summer: Northern California Pacific NW
Seattle Times: Long, hot summer eludes the cloud-shrouded West Coast
New article published online 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
Climate Updates
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)
Since the start of September, northerly summer winds have gone a rapid reversal, with the 7-day mean crossing into southerly mean conditions for the first time since June. The 31-day mean remains slightly above average (+0.09 sigma). The summer wind season was remarkably peaked, with record northerly 31-day winds occurring in the middle of a short season.