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Posted: 3:10 p.m. Wednesday, Feb. 4, 2009
By Kirk Mellish
It's 11:50 pm Saturday, do you know where your weather forecaster is? At
the ole update desk typing this for you. Baring any last minute, and
always possible, major changes in future computer guidance, looks like
nothing but drizzle and a flurry to worry about around here and then a
brief intense cold snap. The models had been in agreement on a blizzard
for the TN and Ohio Valleys into the NE states early next week. But
since then the various equations have shown the 3 jet streams will not
phase into a monster after all, or won't do so until New England states
and SE Canada. If this is indeed the case, I will remember it as one of
the more dramatic busts of a consensus forecast I can remember in over
a decade. Not that the models ever agreed on the details, but on the
big picture, they were all screaming the same message about a possible
historic storm starting just North of Georgia. The single wave Gulf low
is now projected further South and weaker with less moisture, and is
projected to not strengthen or re-develop until somewhere around the VA
Capes. Polar air will send the freeze line back down into FLA by the
4th behind the departing system. Meanwhile the ENSO El Nino Southern
Oscillation after a brief "hiccup" toward El Nino is back in La Ninas
arms again in weak status. You will recall that my Oct and Dec outlook
for the coming winter allowed for a neutral to weak La Nina
expectation. Based on MEI measures the weak La Nina is ranked closest
to the 1974 analog year, one which saw La Nina last well into 1976. You
can web search the government weather services views of what they feel
this means to the weather in the months ahead. Of course, other factors
will play a role, including the SSW event. The stratospheric warming
usually is a pre-cursor signal to colder weather East of the Rockies
with about a 3 week lag. So after the brief cold wave, we get a delayed
January thaw-- in Feb.-- before colder readings return, combined with
the La Nina and MJO, the nation probably faces an interesting Mid-Feb
to early March weather wise.
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