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Area forecast discussion...updated 
National Weather Service Austin/San Antonio Texas 
549 am CST Monday Nov 23 2009 


Discussion... 
see aviation section for the 12z aviation forecast. 


&& 


Aviation... 
patchy fog across the region with IFR/MVFR ceilings and visibilities. As 
mixing begins after 14z fog will begin to dissipate and ceilings will 
gradually lift. Light and variable winds this morning will become 
S/southeast after 15z and increase to 10 to 15 kts. After 06z MVFR ceilings 
develop with S winds 5 to 10 kts. Cold front will move south 
overnight and should begin to move through the taf sites by 08z. 
Some -ra/-shra are possible along and just ahead of the cold front. 
After frontal passage 08z-10z winds will increase out of the north at speeds 
of 5 to 10 kts. After sunrise winds will increase to near 15 kts 
with gusts over 20 kts. 


&& 


Previous discussion... /issued 407 am CST Monday Nov 23 2009/ 


Discussion... 
clear skies this morning have led to good radiational cooling and 
fog has already begun to form across the area. Will continue dense 
fog advisory through middle morning. Once fog Burns off...surface 
high pressure in place for mostly sunny day with high temperatures 
looking to be about ten degrees higher than sun. 


Models are in good agreement of a cold front moving through south 
central Texas tonight and Tuesday. Moisture availability is not great 
with dew points currently in the forties and expected only to 
reach around 60 in the southeast before the front moves through. 
This will mean front will be mainly dry. Highest probability of precipitation will be 
chance category across the south Tuesday morning. Front will bring 
cooler air and temperatures will moderate Tuesday and remain near normal 
through the week. 


Starting Wednesday...surface high pressure and upper level ridge will build 
across Texas and last through the end of the work week. Sat the high 
will shift to the east opening up the Gulf and allowing a slight 
chance for showers in the eastern counties Sat and sun. 


&& 


Preliminary point temps/pops... 
Austin Camp Mabry 74 52 66 44 68 / 0 20 10 10 0 
Austin Bergstrom international Airport 75 52 66 39 69 / 0 20 10 10 0 
New Braunfels Muni Airport 75 53 66 43 70 / 0 20 20 10 0 
Burnet Muni Airport 73 48 64 41 66 / 0 20 10 10 0 
del Rio International Airport 75 52 66 46 69 / 0 10 20 10 0 
Georgetown Muni Airport 73 50 65 42 67 / 0 20 10 10 0 
Hondo Muni Airport 75 52 65 43 70 / 0 20 20 10 0 
San Marcos Muni Airport 75 52 64 42 68 / 0 20 10 10 0 
La Grange - Fayette regional 74 53 64 42 67 / 0 20 20 10 0 
San Antonio International Airport 75 54 67 45 69 / 0 20 20 10 0 
Stinson Muni Airport 74 54 67 44 69 / 0 20 20 10 0 


&& 


Ewx watches/warnings/advisories... 
dense fog advisory until 10 am CST this morning for the following 
counties: Atascosa...Bandera...Bastrop...Bexar...blanco...Burnet... 
Caldwell...Comal...De Witt...Dimmit...Edwards...Fayette...frio... 
Gillespie...Gonzales...Guadalupe...Hays...Karnes...Kendall...Kerr... 
Kinney...Lavaca...Lee...Llano...Maverick...Medina...real...Travis... 
Uvalde...Val Verde...Williamson...Wilson...Zavala. 


&& 


$$ 


05/10