673 
fxus66 keka 231143 
afdeka 


Area forecast discussion 
National Weather Service Eureka California 
345 am PST Monday Nov 23 2009 


Synopsis...high pressure will yield dry weather today through 
Wednesday. A storm system will approach the region late on 
Thanksgiving day and into Friday...bringing the threat for rain and 
higher elevation snow. Dry weather is expected to return for next 
weekend. 


&& 


Discussion...no major weather considerations in the Short Run with 
the next storm system slated for late Thanksgiving day and Friday. 


Early morning weather Roundup features weak ridging aloft with 
offshore flow near the surface providing only a few passing high 
clouds. Good radiational escape has allowed temperatures along the coast to 
fall into the middle to upper 30s at press time and we'll probably lose 
a couple of more degrees between now and sunrise so a frost advisory 
was hoisted until 9 am PST. Otherwise...fair conditions are expected 
today once Interior Valley fog Burns off late this morning. Little 
change to the overall pattern expected tonight into Wednesday as 
high pressure keeps the storm track well to the north. Models remain 
quite consistent on the next system approaching the region on 
Thanksgiving day. Current indications suggest this won't be a long 
duration storm...but the exact strength and track are still up for 
debate at this point. Free-air snow levels appear to remain Above 
All major passes so no winter weather travel difficulties are 
expected for Holiday travelers...but some non-accumulating snow may 
mix in with rain at pass level as colder air filters in behind the 
departing storm early Friday. The highest precipitation amounts look 
to be targeted near the Oregon border down to Cape Mendocino where 
an inch or two of rain is possible. Ridging is expected to fill in 
behind this system so a return to drier weather is anticipated for 
next weekend. Burger 


&& 


Marine...buoy observations this morning show the northwest swell 
slowly subsiding. The Small Craft Advisory for hazardous seas will remain up for a 
few more hours. Expect light winds and seas under 10 feet across the 
waters this afternoon. A longer period northwest swell near 10 feet 
will move through the waters tonight, probably bringing a return of 
Small Craft Advisory conditions. Winds will remain light through Wednesday due to a 
weak pressure gradient across the region. Seas will also remain at 
or just under 10 feet Tuesday and Wednesday. A storm will bring higher 
winds and a large northwest swell towards the end of the week. Stroz 


&& 


Aviation...light offshore winds are bringing VFR to all taf sites 
this morning. A weak pressure gradient will continue to bring 
generally light winds to the taf sites today. VFR are expected to 
prevail this afternoon. Stroz 


&& 


Radar...note to users...the weather forecast office Eureka weather surveillance radar 
kbhx failed at 0307 PST /1107 UTC/ this morning. Electronics 
technicians will attempt to resolve the problem later today. A 
return to service time has not yet been established. 


&& 


Eka watches/warnings/advisories... 


Frost advisory until 9 am PST for caz001-caz002. 


Small Craft Advisory for hazardous seas all waters. 




&& 


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