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Lots of moving parts to our weather picture

As I mentioned yesterday the current sogginess will take a while to move out.  In addition to the dewpoint temperature there is also another meteorological parameter that describes humidity and that is the “precipitable water” value (sometimes provided as the handy government acronym “PWATS”).  As indicated in this link from the Birmingham AL National Weather Service office a PWATS value over 2.00 inches is considered a “very high” amount.  Guess what our current PWATS value is?  You got it…over 2.00 inches.

One weak cold front is on its way toward us today and will create a line of showers and thunderstorms that short range models are indicating will reach the ‘Burg by 3:00 pm this afternoon (Wednesday).  That front will wash out east of the city and provide sunnier but hot & sticky conditions Thursday and Friday with temperatures reaching the low 90′s (F) and dewpoints still hanging around the 70 degree mark.  The next front will eventually bring in cooler and dryer air, but only after more showers and storms over the weekend.  Monday will usher in much dryer weather and high temperatures in the 70′s.  It will seem so cool that you might want to dig out those autumn jackets for next week’s mornings and evenings!

Meanwhile, it looks like the remnants of Isaac aren’t done yet.  Check out this satellite view of the Gulf Coast:

The National Hurricane Center has imparted a 20% chance to this disturbance becoming a tropical system.  This is a piece of Isaac‘s remnant energy (a mesoscale convective vortex) diving southward back into the Gulf of Mexico’s juicy environment.  At the moment it looks like this weekend’s cold front will sweep this system northeastward across the Florida peninsula before it can re-develop into a tropical depression, but Isaac is appearing very zombie-like…it just won’t completely die!

Permalink: http://news.fredericksburg.com/weather/2012/09/05/lots-of-moving-parts-to-our-weather-picture/