This winter has been specially dry, sunny, and cold in the San Francisco Bay Area.
There are 290 snapshots on the left frame, from Sep 1st, 2011 to Jan 18th, 2012, showing the different patterns. See how the 500mb isobar (the blue thick line) is high in latitude. It has been funneling all the low pressure systems up to the North, leaving room down below to the high pressures from the South.
That also explains why the weather has been so bad in Alaska, whatever low pressure was heading East made landfall up North, pouring snow day after day...
Use the indexes under the slides to scroll across time. The date of the snapshot is on top.
The small camera will start or stop the animation of the snapshots.
You can go to the first or last snapshot ( |< & >| ), or move 1 or 10 slides forward ( > or >> ) or backward ( < or << ).
You can also click a slide to blow it up on a new page.
The slides displayed on the left have been realized using the Weather Wizard software, available for free on its site.