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Posted by weathergaines
on June 8, 2009, 11:44 am, in reply to "About SW Monsoon"
124.105.122.66
HI!!!
Based on my analysis, what contributes this strong monsoon rain were enhanced by series of strong shortwave trough. shortwave trough is defined as "A disturbance in the mid or upper part of the atmosphere which induces upward motion ahead of it. If other conditions are favorable, the upward motion can contribute to thunderstorm development ahead of a shortwave trough" its effect are: Shortwaves are often associated with warm (WAA) or cold air advection (CAA), which influence temperature. Due to the way they curve the air that moves around them and the way air moves away from them, shortwaves produce positive curvature vorticity and positive shear vorticity, respectively. Ahead of a shortwave there is large-scale lift due to divergence from positive vorticity advection (PVA). This lift often sparks precipitation. In a capped environment, the lift generated by a shortwave may cool the inversion layer through adiabatic cooling, allowing for deep, moist convection.
As this shortwave troughs moves more equatorward, like typhoons and low pressure areas, it affects the strength of southwest wind. That is to be observed by looking over IR/VIS weather satellite imagery like what happen last week a couple of shortwave trough pass over Northern Philipines which strengthen the aouthwest wind which known as monsoon. HERE ARE THE EXAMPLE IMAGERY DATED TODAY JUNE 8, 2009 AT 0130UTC
--Previous Message--
: Hi. Since the SW monsoon started I've noticed
: that it seems it has become stronger. Last
: year if im not mistaken we only have strong
: monsoon rains only if there was a typhoon
: enhancing it. Are the current disturbances
: really that strong enough to induce strong
: monsoon rains?
:
: Also about the coming El Nino, are we going
: to have a short rainy season? Does this
: monsoon rains shows a transition from La
: Nina to El Nino condition, like the opposite
: of what happened June to early August 2007?
:
:
:
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