Monday, December 9, 2013

cooler air coming... (pm.09.dec.13)>

Still keeping an eye on the weather charts for the western Himalayas, making sure we don't get surprised by some kind of sudden winter storm development.  This time of year is normally quiet, and that's what we've been seeing for several weeks now.  There have been many weak upper-level disturbances riding eastward on a strong west-to-east jet stream flow in the upper atmosphere, but the lack of moisture from Arabia into northern India is preventing any outbreak of precipitation.

As I mentioned earlier, there have been occasional periods of high clouds drifting through in conjunction with these weak disturbances, but there have also been long stretches of sunshine as well.  All in all, acceptable late autumn/early winter weather.

Temperatures have been gradually dipping... as we would expect as we approach the winter solstice and the shortest days of the year.  It looks like there will be a fresh surge of colder air arriving during the latter part of the week, and lasting through the weekend.  This will likely be the coldest of the season thus far, with highs struggling to get much above 50F (10C) by Friday and Saturday.

Looking way way way ahead... there is an indication of some kind of storm system developing in our vicinity after the 20th of December.  That's very far away for any kind of an accurate resolution of computer model data... but something to anticipate nonetheless.