Updated 930am CDT Tuesday / 25 September 2012
A Dry and Stable Weather Pattern Continues …
More Unsettled with Increased Clouds/Rain Chances Late Week and Weekend …
On this Tuesday… a high pressure area is located over the southeastern USA and another over the southern Rockies. A low pressure area is over south southwestern Kansas with a trough.. or line.. of low surface pressure southwestward fro the surface low into west Texas and eastern New Mexico. As a result of this surface pattern, a southerly surface wind prevails across our area.
In the upper levels of the atmosphere, the ridge of upper air high pressure that has been overhead is being suppressed to the south of the area now with an east southeastward upper level low pressure area is over Utah. As a result of this upper air wind flow, our upper level winds are light westerly.
Southerly surface winds continue across our area with patchy fog and morning low cloudiness and patchy fog prevailing with an otherwise partly cloudy sky.
By late week into the weekend, the upper air low pressure disturbance.. to our northwest.. will combine with available moisture (including tropical moisture from the Pacific Ocean) to produce increased clouds and widely scattered to scattered rain showers and thunderstorms.. particularly Friday night into Saturday. Current guidance suggests that we could see 1/4 to 3/4 inch of rain from this system.
As the upper air low pressure disturbance passes, a weak surface cold front will pass through the area by Sunday morning with slightly cooler and drier air taking hold in a more stable airmass Sunday night into Monday.
For Austin and south central Texas… tonight will see a mostly clear sky with low clouds developing after 10pm. Lows in the in the 70s with a south southeasterly wind. For tomorrow, it’ll be mostly sunny after some morning low clouds and patchy fog with highs around 90 with a southerly wind.
Have a good Tuesday night and Wednesday…
Meteorologist Troy Kimmel