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  Area forecast discussionArea forecast discussion
This national weather service
Product is intended to provide a
Well-reasoned discussion of the
Meteorological thinking which went
Into the preparation of the zone
Forecast product. The forecaster
Will try to focus on the most
Particular challenges of the
Forecast. The text will be written
In plain language or in proper
Contractions. At the end of the
Discussion, there will be a list of
All advisor...
Click for more......updated 
  National weather serviceNational weather service
An agency of the federal government
Within the department of commerce,
National oceanic and atmospheric
Click for more... pendleton or 
  310 am PstPst
Pacific standard time
Click for more... wed feb 10 2010 
   
  updated aviation discussion 
   
  .Short term...today through Friday...the next system seen just off  
  shore will slowly move to the coast today. The forecast area will be  
  under an upper RidgeRidge
An elongated area of relatively
High atmospheric pressure; the
Opposite of trough.
Click for more... of high pressure. However abundant MoistureMoisture
Refers to the water vapor content
In the atmosphere, or the total
Water, liquid, solid or vapor, in a
Given volume of air.
Click for more...  
  ahead of the next weather system will move into the region over the  
  top of the RidgeRidge
An elongated area of relatively
High atmospheric pressure; the
Opposite of trough.
Click for more... as the RidgeRidge
An elongated area of relatively
High atmospheric pressure; the
Opposite of trough.
Click for more... axis slowly shifts eastward. The day  
  will start out mostly dry...but clouds will thicken and lower with  
  PrecipitationPrecipitation
The process where water vapor
Condenses in the atmosphere to form
Water droplets that fall to the
Earth as rain, sleet, snow, hail,
Etc.
Click for more... spreading across the forecast area by this afternoon  
  from west to east. Due to the southwest FlowFlow
(abbrev. Flw) wind. In meteorology,
A qualitative reference of an air
Parcel(s) with respect to its
Direction of movement, sometimes
Specified at a certain height or
Pressure elevation, e.G. Westerly
Flow at 500 mb. In hydrology, the
Volumetric flow of water past a
Given point on a stream or river,
Usually in cubic feet per second
(cfs)
Click for more... behind the RidgeRidge
An elongated area of relatively
High atmospheric pressure; the
Opposite of trough.
Click for more... and  
  the presence of the RidgeRidge
An elongated area of relatively
High atmospheric pressure; the
Opposite of trough.
Click for more... itself temperatures will be mild with high  
  snow levels so there will not be any concern for any winter precip  
  advisories. All areas should receive at least several hundreths to  
  several tenths of an inch of rain during the next 24 hours. Another  
  weather system will quickly follow behind the first on Thursday and  
  will accompany a rather tight but narrow upper TroughTrough
An elongated area of relatively low
Atmospheric pressure, usually not
Associated with a closed
Circulation, and thus used to
Distinguish from a closed low. The
Opposite of ridge.
Click for more.... The pressure  
  gradients between these two systems will cause moderate to strong  
  low level winds across the cascades resulting in a LeeLee
The side or part that is sheltered
Or turned away from the wind, such
As with a mountain.
Click for more... side TroughTrough
An elongated area of relatively low
Atmospheric pressure, usually not
Associated with a closed
Circulation, and thus used to
Distinguish from a closed low. The
Opposite of ridge.
Click for more...  
  to develop along with windy conditions...mainly in central Oregon.  
  at this time the winds are not expected to exceed AdvisoryAdvisory
Highlights special weather
Conditions that are less serious
Than a warning. They are for events
That may cause significant
Inconvenience, and if caution is
Not exercised, it could lead to
Situations that may threaten life
And/or property.
Click for more...  
  criteria...but windy conditions are likely nevertheless. Strongest  
  winds will occur from this afternoon through Thursday evening...and  
  then will diminish. However...yet another weather system will move  
  into the forecast area on Friday with another shot of PrecipitationPrecipitation
The process where water vapor
Condenses in the atmosphere to form
Water droplets that fall to the
Earth as rain, sleet, snow, hail,
Etc.
Click for more....  
  temperatures will continue to be mild with fairly high snow levels  
  through Friday and likely beyond. As such with these three systems  
  and mountain snow melt taking place there may be significant rises  
  on rivers and streams through the remainder of the week into the  
  weekend. Will need to monitor this closely for the possible need of  
  hydrology advisories or warnings. 88 
   
  .Long term...Friday night through Tuesday...progressive westerly  
  FlowFlow
(abbrev. Flw) wind. In meteorology,
A qualitative reference of an air
Parcel(s) with respect to its
Direction of movement, sometimes
Specified at a certain height or
Pressure elevation, e.G. Westerly
Flow at 500 mb. In hydrology, the
Volumetric flow of water past a
Given point on a stream or river,
Usually in cubic feet per second
(cfs)
Click for more... will persist during this time period. A wave will move through  
  eastern Washington and Oregon Friday night bringing a chance of  
  showers to the area. More waves will move through Saturday night and  
  Sunday. Upslope showers will linger in the mountains Sunday night  
  through Tuesday. Snow levels will remain high...so snow accumulation  
  with these systems will remain low. Temperatures will remain mild.   
  coonfield 
   
  && 
   
  .Aviation...12z tafs. Sct-bkn 080 MslMsl
(mean sea level) - the arithmetic
Mean of hourly water elevations
Observed over a specific 19-year
Tidal epoch. 
Click for more... with patchy FogFog
(abbrev. F) fog is water droplets
Suspended in the air at the earth's
Surface. Fog is often hazardous
When the visibility is reduced to ¼
Mile or less.
Click for more... will persist  
  this morning. Patchy FogFog
(abbrev. F) fog is water droplets
Suspended in the air at the earth's
Surface. Fog is often hazardous
When the visibility is reduced to ¼
Mile or less.
Click for more... is possible Wednesday morning. Increasing  
  clouds in the afternoon with approaching Warm frontWarm front
A transition zone between a mass of
Warm air and the colder air it is
Replacing.
Click for more.... Rain likely for  
  all TafTaf
Terminal aerodrome forecast
Click for more... sites Wednesday evening with ceilings 020-040. Surface winds  
  less than 10kt.  78 
   
  && 
   
  .Preliminary point temps/pops... 
  pdt  48  36  48  37 /  20  50  50  30  
  alw  48  35  46  40 /  20  50  40  30  
  psc  47  35  49  38 /  20  40  40  30  
  ykm  46  31  45  33 /  30  50  40  30  
  hri  48  37  49  36 /  20  50  40  30  
  eln  44  30  42  33 /  30  50  40  40  
  rdm  49  34  52  33 /  30  60  50  30  
  lgd  41  31  45  38 /  10  50  50  50  
  gcd  44  32  49  35 /  10  60  50  30  
  dls  49  36  50  40 /  40  70  50  30  
   
  && 
   
  .Pdt watches/warnings/advisories... 
  or...none. 
  wa...none. 
  && 
   
  threat index 
  today : green 
  Thursday : green 
  Friday : green 
   
  green: none or limited need for watches, warnings, or advisories. 
  yellow: a few watches, warnings, or advisories possible or in effect. 
  red: numerous watches, warnings, or advisories possible or in effect. 
   
  for additional weather information, check our web site at... 
  Www.Weather.Gov/pendleton 
   
  
 
   
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