Monday, March 17, 2014

more and more unstable... (am.17.mar.14)>

*Update @ 8:50am... I failed to mention the usual gusty winds which normally accompany a weather system like this.  Already there has been some of that during the past hour or so.  No rain threatening at the moment -- and other than perhaps some light showers here and there, I think the potential for heavier rain/thunderstorms will hold off until late in the day.

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The sky is overcast at sunrise this morning, but it remains very mild.  My overnight low has been 58.5F (14.7C), and it's just above 60F (15.6C) at the moment.  There has been no rainfall yet, with humidity remaining rather low -- at 37%.

There were lots of Holi shenanigans going on yesterday, but today is actually the official holiday.  The weather situation is not going to be nearly as nice as yesterday, though, due to an approaching upper-level disturbance which is going to bring an increasing chance of some showers and thunderstorms as the day wears on.  Right now that disturbance is beginning to enter extreme western Afghanistan, and will roll eastward -- arriving right over northern India by mid-day tomorrow (Tues).  So far all it has done is stir up a lot of mid- and high cloudiness out ahead of the main circulation, but as increasing amounts of moisture get pushed up against the mountains, we'll start to see some precipitation development.  It's looking like the bulk of the rainfall would occur between this afternoon and Tuesday afternoon -- in the form of a few waves of rain and thunderstorms.  We may have a period of extreme instability for several hours, as some colder air arrives aloft, over-riding this very mild air at the surface.

This system may get out of here more quickly than previously expected, with rain chances rapidly diminishing tomorrow night.  That will leave us with a rather flat and featureless west-to-east flow in the upper-atmosphere for the remainder of the week -- providing us with sunshine and occasional clouds, along with relatively pleasant temperatures.

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