509 
fxus61 klwx 220141 
afdlwx 


Area forecast discussion 
National Weather Service Baltimore Maryland/Washington District of Columbia 
841 PM EST Friday Nov 21 2008 


Synopsis... 
high pressure will build over the region for the weekend. A 
strong cold front will move through on Monday...bringing the next 
chances for precipitation. High pressure builds in for the middle 
to end of next week. 


&& 


Near term /tonight/... 


"jan in nov"... wintry event in the process of winding down. We've 
received reports of icy roads and accidents across the northern 
1/4 of our County Warning Area..and are handling these west/ an Special Weather Statement. However the 
acumulating snows are waning and hence Winter Storm Warning has been 
dropped. In its wake middle Atlantic region will have an abnormally cold night..in 
fact at 8 PM temperatures are below middle Nov low temperature norms. It will still be 
brzy for the overnight hours...although not as windy as it was erlr today. 


&& 


Short term /Sat/... 


Cold and brzy. Highs only a few degrees above freezing at peak 
heating. Wind chill values drng the day will likely be steady in 
the l/m20s. Wind speeds will be 15-20 miles per hour range. Partly cloudy 
skies and very dry. 


&& 


Long term /Saturday night through Friday/... 
zonal flow aloft will be the rule for the weekend. Strong shortwave 
energy and an upper low begin to dig southeast out of central Canada 
on Monday. The negatively tilted trough axis looks to come through 
overnight on Monday. Broad troughing will remain near the eastern 
Seaboard through most of next week...as several pieces of shortwave 
energy dive southward. 


High pressure at the surface on Saturday night...will shift eastward 
out to sea on Sunday as a cold front approaches from the west. The 
front is expected to move through on Monday afternoon and evening. 
Upslope snow showers should begin in earnest Monday afternoon and 
evening...and last through much of Tuesday. High pressure will build 
back over the area for the middle of the week. 


Not many changes to the ongoing forecast package were needed. 


&& 


Aviation /02z Saturday through Wednesday/... 
VFR conds expeceted overnight. 


VFR ceilings/visibilities are likely through the weekend as high pressure 
settles over the area. Sub VFR ceilings/visibilities are anticipated Monday 
into Monday evening as a cold front moves through. Low ceilings could 
persist into Tuesday. High pressure will build back over the area 
for middle week with improving conditions. 


&& 


Marine... 
Gale Warning has been dropped. Small Craft Advisory will take its place for the 
overnight hours...lasting through all of Saturday into Sunday morning. Strong 
winds will continue to push across the waters from a passing upper 
level trough axis...which will keep it/S influence over the Bay through 
Sat. 


Winds will dip below criteria on Sunday as high pressure settles 
over the area. Small craft conditions are expected once again 
Monday and Tuesday as a cold front moves through the area. 


&& 


Lwx watches/warnings/advisories... 
District of Columbia...none. 
Maryland...none. 
Virginia...none. 
WV...none. 
Marine...Small Craft Advisory until 4 am EST Sunday for anz530>537. 


&& 


$$ 
Update...Woody! 
Prvs...gms/nwl