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AREA FORECAST DISCUSSION
fxus66 kpdt 101111 aaa afdpdt 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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