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fxus64 kewx 212352 
afdewx 


Area forecast discussion 
National Weather Service Austin/San Antonio Texas 
552 PM CST Sat Nov 21 2009 


Discussion... 
see aviation for 00z taf discussion below. 


&& 


Aviation... 
low cloud clearing line was slowly retreating east late in the 
afternoon, but appears to have stalled briefly early this 
evening. The 1000 feet cloud layer should pull away from aus during 
the evening, but the light winds and near 100 percent relative humidity values 
should mean an early onset of fog and possible vlifr conditions 
before midnight. Temperatures will be slower to cool to the dew point at 
Sat/ssf where clearing and some drier air has mixed in, so dense 
fog is not expected to develop until after midnight. Fog should be 
able to develop toward sunrise for drt. The shallow moist layer 
should mix out quickly to give way to mostly sunny skies for all 
areas by 16z. 


&& 


Previous discussion... /issued 305 PM CST Sat Nov 21 2009/ 


Discussion... 
the upper level system which gave US friday's beneficial rainfall 
will finally exit the region this evening resulting in clearing 
skies across our eastern County Warning Area. There is ample ground moisture from 
the rains and with radiational cooling and light winds overnight.. 
expect patchy fog development late tonight over all but far north.. 
northwest and far southwest portions of the County Warning Area. The shallow fog 
condition should mix out by late morning and with a light southerly 
flow returning to virtually all of the region by midday..should 
have a mostly sunny and mild Sunday afternoon with high temperatures 
around 70. Another round of patchy morning fog Monday..then a 
developing surface low over northwest Texas will continue 
advecting Gulf moisture northward during the day..producing a few 
showers by late afternoon over south central sections. The 
southern part of a rapid moving upper air trough with attendant 
cold front will push through the area overnight Monday and early 
Tuesday with showers and thunderstorms possible along and ahead 
of the front. Clearing and colder Tuesday night with lows in the 
30s Hill Country..40s elsewhere. Mostly sunny but cool Wednesday. 
A Mammoth Ridge-trough couplet dominating the entire U.S. On 
Thanksgiving will anchor a dry surface ridge over south Texas. 
This will result in mostly clear skies but a chilly Thanksgiving 
morning and a mild to cool afternoon. This anchored Dry Ridge 
pattern will keep through next Saturday with return southerly 
flow and moisture late next weekend as the upper level flow 
becomes zonal. 


&& 


Preliminary point temps/pops... 
Austin Camp Mabry 47 71 50 73 57 / 0 - - - 30 
Austin Bergstrom international Airport 41 69 44 74 56 / 0 - - - 30 
New Braunfels Muni Airport 45 71 47 73 58 / 0 - - - 30 
Burnet Muni Airport 47 69 52 70 48 / 0 - - - 20 
del Rio International Airport 46 72 51 73 55 / 0 0 0 - 10 
Georgetown Muni Airport 47 68 50 71 55 / 0 - - - 20 
Hondo Muni Airport 46 72 48 72 58 / 0 0 - - 30 
San Marcos Muni Airport 46 69 48 74 57 / 0 - - - 30 
La Grange - Fayette regional 45 69 48 75 58 / - - - 10 30 
San Antonio International Airport 49 71 50 74 59 / 0 - - - 30 
Stinson Muni Airport 47 71 49 73 61 / 0 0 - - 30 


&& 


Ewx watches/warnings/advisories... 
none. 
&& 


$$ 


11/18