this period looks to be quite challenging more-so than usual as
models struggling with timing of several amplifying shortwaves within
active and strengthening northern Continental U.S. Jet. Uncertainty also
compounded by potential impacts on typhoon lan on downstream pattern.
In general though the suggestion is for the potential of a couple
of additional cold frontal passages followed by quick bouts of
surface ridging during this time frame. This will lend support
to the typical fall roller coaster on temps-
As mentioned above regarding typhoon lan watching the western Pacific
for big implications (colder) on our weather late next week and
especially next weekend. Often times a recurving typhoon in the western
Pacific, as the case with lan, results in a buckling of the jet
orientation over North America, in turn leading to a central and
eastern US trough and trend toward colder conditions. Typically if
a system recurves over or east of Japan, as appears to be case with
lan, this takes about 6-9 days to occur where as if a system were to
recurve further west toward China this may take about 2 weeks to develop.
In any event, the bottom line is trends support a transition to a colder
pattern next week and just beyond with increasing risk for a
The last time a Typhoon buckled the jet stream was in November,
(few years back)I believe we had a week of below freezing weather and I think
a low of 6F.
Remember this??? Nori was its name.
hers an article about it...