026 
fxus63 klbf 202009 
afdlbf 


Area forecast discussion 
National Weather Service North Platte NE 
310 PM CDT Sat Mar 20 2010 


Synopsis... 
at 19z...hand analysis of the surface data showed high pressure 
centered in eastern Nebraska and northwest Colorado. There was also 
a trough or warm front along the High Plains from southwest 
Saskatchewan through the eastern parts of Montana...Wyoming and 
Colorado. A cold front was stretched across Manitoba... 
Saskatchewan...Alberta and British Columbia. A very cold air mass 
was poised north of that front. In the upper levels...the 6.7 micron 
water vapor imagery showed a developing wave in northern Oklahoma 
and south central Kansas. In the northwest...a maturing cyclone was 
located off the coast of British Columbia. 
&& 


Short range...tonight through Tuesday night. 
Lows tonight are likely to be a little colder than they were 
last night. Then...as an upper ridge builds into the northern 
plains...warmer temperatures are expected Sunday and even warmer 
Monday. 
A front coming through late Monday afternoon and night will 
generate enough system relative isentropic lift and elevated 2d- 
frontogenesis to produce some precipitation. In fact...there is 
100-200mb pressure decrease on the 290k...295k and 300k surfaces. In 
addition...precipitable water values increase to about 0.50 and 
elevated lifted indices decrease to -3c Monday night in the 
southeast Nebraska Panhandle. As a result...we will include some 
chance of precipitation Monday night with a mention of thunderstorms 
in the Panhandle. The chances of precipitation will diminish through 
the day Tuesday and Tuesday night as the front makes its way to the 
Southern Plains. 


Extended...Wednesday through Saturday. 
Cool weather will then continue through middle-week with cold 
nights and not-so-warm days. 
By late Friday night to early Saturday...a warm moist trajectory 
develops in the 290-300k layer from the Texas Gulf Coast to the 
northern plains. Isentropic upglide is indicated in that layer as 
well...so the mention of precipitation next Saturday is appropriate. 
Still...since that is day seven of the forecast...we will keep the 
probability low. 
&& 


Aviation... 
VFR condition in place throughout region with cloud deck 
associated with cold air aloft moving across southwest Nebraska this 
afternoon. North winds occasionally gusting up to 20 miles per hour but this 
should be subsiding by around sunset. VFR ceilings/visibilities will remain in 
place through the next 24 hours as drier and warmer air arrives. 
&& 


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


$$ 
Short range/extended...Springer 
aviation...13