707 
fxus63 klbf 210955 
afdlbf 


Area forecast discussion 
National Weather Service North Platte NE 
355 am CST Friday Nov 21 2008 


Discussion... 
south winds have been slow to kick in...while low clouds have 
remained along the Front Range...which has resulted in temperatures 
dropping to the coldest of the season...especially across 
central/eastern Nebraska where a few single digits have been 
reported. Temperatures for the most part are bottoming out with a few 
locations up a degree from last hour as winds have picked up. 


Center of elongated surface high runs from southern Minnesota to northern Texas...and 
high is drifting to the southeast. Meanwhile a Lee side trough is 
developing and will strengthen during the day. The close 
proximity of the deepening low pressure to the west and the 
departing strong high in the east...will cause increasing winds 
across central Nebraska today. Guidance is in good agreement as 
winds increase briefly to around 20 kts early in the afternoon. 
Across western Nebraska...winds not as strong...closer to 10 to 
15 kts. 


Next short wave already crossing the northern rockies and will 
slide across the Dakotas later today/tonight...into the central 
miss River Valley by Saturday morning. Arctic high dried the 
atmosphere out substantially and will take some time to saturate. 
Plenty of middle/high moisture seen on water vapor imagery headed 
this way...however bl is very dry. Bl will be slow to saturate as 
surface dew points in the teens all the way into North Texas...and models 
continue to keep majority of the lift along and north of the S 
Dakota/Nebraska border. Will continue to mention S chance of snow near 
the border...however am expected most of the area to see virga or 
flurries. 


Northwest flow continues this weekend as ridge builds across the 
western states. Next cold front to push through the plains Sunday. 
Still dry bl and expect an increase in clouds along with cooler 
temperatures. Then ridge migrates east over the southern/Central Plains. 
This continues a dry forecast and a rise to above seasonal 
temperatures. 


&& 


Aviation... 
a fast moving system will drop out of northwest flow across the 
Dakotas today affecting northern Nebraska late this afternoon and 
tonight. Limited low level moisture will bring mainly middle and high 
cloudiness to western and north central Nebraska with the 
possibility of light precipitation chances along the Nebraska 
South Dakota border tonight. Both NAM and GFS close 500 mb. Good 
forcing at middle levels...enough to warrant precipitation group for kvtn 
this evening. 


&& 


Lbf watches/warnings/advisories...none. 
&& 


$$ 


Short term/extended...power 
aviation...masek