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Posted by Gus
on December 25, 2010, 8:17 am, in reply to "Re: La Niña Configuration"
112.206.88.14
Helo nikos, I just want to know if we can still experience a bit cooler northeast monsoon affecting luzon and parts of visayas before the year ends because I've noticed a winter monsoon over china gradually moving southwards.
--Previous Message--
: hi gus,
:
: actually the seasonal cold "Siberian
: HPA", the source of NE monsoon, appears
: to be present. however its ridge is the one
: restricted by the more dominant -thanks to
: La nina - "Semipermanent North Pacific
: HPA" (source of the trade winds). What
: we're seeing this time are the almost
: "flattened isobars" (i mean almost
: parallel to latitude lines) in the batanes
: and taiwan area. This situation favored a
: strong convergence between amihan and the
: trade winds indicated by the
: "stationary front" in sir Mike's
: t2k satellite analysis. The amihan flow is
: pushed to the west.
:
: [note: refer to current JMA maps and
: animate for visual aids]
:
: The visible formation zone of midlatitude
: lows (Low) (shortwave troughs) are usually
: to the west over the eastern himalayas and
: Myanmar. They move approx.
: north-northeastward and by the time they
: reach the vicinity of eastern China and
: Taiwan they form fronts. then, as the Low
: intensify and move further eastward their
: fronts become more established and
: elongated. Usually this is also the time
: that the ridge of the cold HPA intensify in
: unison behind the cold front. by the time
: the Low is NE of Taiwan, the ridge has
: extended further south and we get a surge of
: cool amihan (ie,pagasa issues a
: "tail-end of cold front
: advisory"). Of course, this ridge
: eventually detaches from its parent HPA and
: becomes a shallower subtropical HPA moving
: East and sometimes it intensifies and merges
: with the North pacific HPA.
:
: Now, i think the case is different:
: The Lows (midlatitude) develop much further
: East at approx NE of Luzon. Then, they
: quickly move NNE'ward into the higher
: latitudes. So by the time they form fronts
: their much further away and the HPA behind
: the front produces a ridge that propagates
: more eastward instead of southward. The
: absence of low pressure system genesis over
: the Eastern himalayas is compensated, i
: think, by the warm low over the Philippines
: and south china sea. Thus, Tropical Cyclone
: formation is favorable there but die off
: quickly due to proximity to land. Hmmm... i
: think that makes sense. La Nina also
: promotes the "warm pool" over
: south china sea care of the strong
: easterlies (trade winds). Hmmm...
:
:
: hope this helps.
:
: nikos
:
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