179 
fxus63 kdmx 200437 aaa 
afddmx 


Area forecast discussion...updated for aviation 
National Weather Service Des Moines Iowa 
1135 PM CDT Tuesday Aug 19 2008 


Discussion... 
high pressure will dominate the area tonight resulting in light and 
variable winds...generally southeast to south...and few-scattered middle 
level clouds. Only significant weather impact will be potential for 
early morning fog. At this time such potential seems mitigated by 
partly cloudy skies and just a few knots of wind...so have only 
included patchy fog north of the I-80 corridor. Any dense fog should 
be very localized...and only significant impacts will be to aviation 
concerns. Wednesday should be similar to today with temperatures close or perhaps 
a degree warmer than highs Tuesday. Closed low that has worked its way 
south through The Rockies in to the southern U.S. Will finally lift northward into 
the central Continental U.S.. moisure increases Wednesday night and continue into Thursday. 
Expect to see sig cooling around upper low and dropped temperatures into the 
middle to upper 70s for Thursday. Would not be surprised to see them 
actually turn out another 3-5 degree cooler...depending on how thick 
the clouds are. Unsettled period Friday into Sat yet as low pressure/wind shift 
line moves in from the northwest. Friday will be a tricky day as the exiting system 
from Thursday will have some separation from the approaching system to the northwest. 
This may allow temperatures to recover for a while Friday. Cold front passes Friday 
night into Sat...then expect to see another relatively dry period as hi 
pressure builds into the upper Midwest. Thinking at this time is that convection 
around the edge of the high will be pushed to the SW of the County Warning Area and 
have played it that way for the first part of next week. 


&& 


Aviation...20/06z 
VFR cielings expected for most of the next 24 hours...however 
visibility will be a different story over northern taf sites. May 
see IFR briefly between 9-12 z especially at kfod with dew point 
depressions already in the 2-3 degree range. Through the Highway 30 
corridor. Surface winds will be light throughoput the forecast. 


&& 


Dmx watches/warnings/advisories...none. 


&& 


$$ 


Short term...Lee 
long term...MS Aug 08 
aviation...Russell