Wednesday, February 16, 2011

POSITIVE EASTERN PACIFIC OSCILLATION (EPO) PATTERN - WILL SOON WEAKEN

Jetstream image
I would like to examine the jet-stream configuration over western North America, by examining this jet-stream map from NOAA's NWS - Seattle, WA. It is of interest to note the clear defined trough over the eastern Pacific, which is the area I will be watching as heights build as a result of the weakening Positive EPO. Once this happens, the Broad Upper Trough will be replaced with Upper Ridging over the Gulf of Alaska and eastern Pacific as the EPO becomes Negative. As heights rise in the West, they will fall in the East with the return of the Negative AO. This change will happen in stages, with the first being the return of seasonal temperatures around Feb. 20-24. It is after Feb. 25 when I believe Winter will truly return in New England, as the AO & NAO become increasingly Negative.   

2 comments: