Your maximum tornado strength has been F3 and you've had 3 of them, 1 in
1969 and 2 in 1972. You've had 14 F2 tornadoes which stretch from 1916
to 1986. With the exception of the 1 in 1916 the rest are clustered
between 1949 and 1986 which also takes in the F3s. Interestingly, all
have occurred at the low side of the temperature cycle of the Pacific
Decadal Oscillation (PDO). The PDO has a very rough cycle of about 30
years. Just about that much time has gone by since the last cooling
cycle and the PDO appears to be entering another cool period. I just
happened to notice the correlation with the PDO but have no idea if it's
really involved or not. But if it is you could be in for more tornadoes
in this coming cycle.
But, if there's any relationship with global warming, it's awfully hard
to see as there's no attendant increase of frequency or severity with
rising global or northern hemisphere temperatures.
"Tipping points"??? More non-scientific and unfalsifiable speculation.
Chuck Norcutt
On 4/17/2012 12:34 PM, Mike Lazzari wrote:
>> ....Low strength tornado reports have increased due to the recent
>> introduction of Doppler radar ....
> Chuck I was talking about possible future increase only _in the PacNW_.
> We have unique geography. Currently there are a few micro climates with
> reports of funnel clouds annually and of those only one has ever been
> deadly in my lifetime. 1972 in Clark County. Tornadoes tend to be a
> "tipping point" phenomena. Right now things don't quite gel but give us
> a couple more degrees...
>
> <http://www.tornadoproject.com/alltorns/watorn.htm>
>
> Mike
>
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