741 
fxus65 kslc 211618 
afdslc 


Area forecast discussion 
National Weather Service Salt Lake City Utah 
1018 am MDT Thursday Aug 21 2008 


Synopsis...storm system moving east across the northern rockies 
will drop a weak cold front into northern Utah this evening. Winds 
will increase this afternoon as this feature approaches. 


&& 


Discussion...cold front over southern Idaho is moving southward 
and will move into northern Utah by 6 PM. Upper level support is 
lacking initially and the main influence of this system will be a 
gradual wind shift to the north upon passage. Front should make it 
south of Provo before stalling out by morning. This will provide a 
cooler day on Friday but the front will retreat over the weekend 
bringing above normal temperatures back to northern Utah for the 
weekend. There is a marginal increase in low level moisture and 
this will come into play tomorrow and Saturday as distrubances 
ride over the frontal boundary generating isolated high-elevation 
thunderstorms. In the meantime...confluent flow aloft will inhibit 
activity today. 


No update to the forecast this morning. 


&& 


Aviation...VFR conditions will prevail throughout the day at the 
slc terminal. South winds are expected to shift to the west 
between 20z and 22z as a cold front drops into northern Utah. 
Gusts along and behind this front may exceed 30 kts at the 
terminal through 02z...resulting in erratic cross winds...before 
winds shift to the north. There is a 20 percent chance this shift 
will occur before 20z. 


&& 


Fire weather...a dry cold front will move through northern Utah 
late this afternoon into this evening. Gusty south winds will 
develop this afternoon ahead of the cold front across the western 
portion of Utah. As the cold front passes through the northern 
portion of fire weather zone 420 this afternoon and early 
evening...winds will shift to the northwest and humidities will 
increase. Across the remainder of the warned area...southerly winds 
and low humidities will continue to create severe fire weather 
conditions into the evening. 


&& 


Slc watches/warnings/advisories... 
Utah...red flag warning from noon until 9 PM Thursday for 
fire weather zones 420...423...434 and 435. 
Wyoming...none. 


&& 


$$ 


Public...Pomeroy 
fire weather...Kruse 
aviation...Seaman 


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http://weather.Gov/saltlakecity (all lower case)