Wednesday, May 1, 2013

may day... (am.01.may.13)>

The first morning of May has dawned with a mostly sunny sky, low humidity (36%), and the mildest early morning temperatures of the season.  My overnight low here in the upper part of town was 62.8F (17.1C), and once again, there has been no rainfall to report.

A very slow-moving upper-level disturbance and circulation is located over extreme northern Pakistan, but has still not really made its presence known here in our neighborhood.  The atmosphere has remained generally stable and very dry during the past few days, despite expectations of an increasing chance of some showers and thunderstorms.  There's still a chance of some development, however, as colder air aloft sinks into northern India today and tonight, riding over the top of much warmer air at the surface.  The limiting factor for thunderstorm development will be the lack of available moisture -- some of the driest air of this spring/early summer season is pretty well established across northwest India right now, so even if we get enough instability to trigger some thunderstorms, rainfall amounts shouldn't be much to get excited about.

Lingering instability on Thursday could lead to some afternoon thunder development over the mountains, but a dry, generally stable and increasingly warm scenario is expected as we move into the weekend.  It's starting to look and feel like summer is definitely getting under way.

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