FXUS65 KREV 242234 
  AFDREV 
   
  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... 
  NATIONAL WEATHER SERVICENATIONAL WEATHER SERVICE
An agency of the Federal Government
within the Department of Commerce,
National Oceanic and Atmospheric
Click for More... RENO NV 
  234 PM PSTPST
Pacific Standard Time
Click for More... TUE NOV 24 2009 
   
  .SHORT TERM... 
   
  A LOW PRESSURE SYSTEMLOW PRESSURE SYSTEM
An area of a relative pressure
minimum that has converging winds
and rotates in the same direction
as the earth. This is
counterclockwise in the Northern
Click for More... DEVELOPING OVER THE GULF OF ALASKA IS 
  HELPING TO AMPLIFY AN UPPER RIDGERIDGE
An elongated area of relatively
high atmospheric pressure; the
opposite of trough.
Click for More... ALONG THE WEST COAST. THE RIDGERIDGE
An elongated area of relatively
high atmospheric pressure; the
opposite of trough.
Click for More... 
  IS PRODUCING WARMING TEMPERATURES ALOFT...SLOWER WARMING IN LOWER 
  ELEVATIONS DUE TO NORTHEAST LOW LEVEL 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... WHICH WILL CONTINUE TO 
  STRENGTHEN INVERSIONS AND HINDER TEMPERATURES RECOVERIES AGAIN ON 
  WEDNESDAY.  
   
  THE GULF OF ALASKA LOW WILL EJECT A SHORT WAVE TOWARD THE WEST 
  COAST ON THURSDAY...MOVING INTO NORTHERN CACA
California
Click for More... THU NIGHT AND 
  THROUGH WESTERN NV WITH ITS ASSOCIATED COLD FRONTCOLD FRONT
A zone separating two air masses,
of which the cooler, denser mass is
advancing and replacing the warmer.
Click for More... FRI AND FRI 
  NIGHT. MODELS DIFFER IN HANDLING THIS SHORT WAVE WITH THE GFSGFS
Global Forecast System - One of the
operational forecast models run at
NCEP. The GFS is run four times
daily, with forecast output out to
384 hours.
Click for More... 
  FASTER AND WEAKER AND THE ECMWFECMWF
European Center for Medium-Range
Weather Forecasts. Operational
references in forecast discussions
typically refer to the ECMWF's
medium-range numerical forecast
model, which runs out to 10 days.
Click for More... SLOWER AND STRONGER. THE NAMNAM
The operational North Amercian Meso
(NAM, formerly Eta, currently the
same as the WRF) is run four times
per day (00,06,12,18Z), all cycles
run to 84-h.
Click for More... IS 
  SOMEWHAT OF A COMPROMISE WITH SLOWER TIMING PER ECEC
ECMWF Forecast Model
Click for More... AND WEAKER PER 
  GFSGFS
Global Forecast System - One of the
operational forecast models run at
NCEP. The GFS is run four times
daily, with forecast output out to
384 hours.
Click for More.... NONE OF THE SOLUTIONS PROVIDE MUCH 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... WITH ONLY A 
  FEW HUNDREDTHS INCH POSSIBLE FOR NORTHEAST CACA
California
Click for More... AND NORTHWEST NV THU 
  NGT THROUGH FRI. 
   
  WINDS BECOME GUSTY THU AFTNAFTN
Afternoon
Click for More... INTO THE EVENING WITH THE APPROACHING 
  SHORT WAVE. TIMING SEEMS TO BE SLIGHTLY SLOWER THAN PREVIOUS MODEL 
  RUNS AS 40 KNOTKNOT
(abbrev. Kt) Unit of speed used in
navigation, equal to 1 nautical
mile (the length of 1 minute
latitude) per hour or about 1.15
statue miles per hour, or 0.5
meters/sec). 
Click for More... H7 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... HOLDS OFF UNTIL THU EVENING. RIDGERIDGE
An elongated area of relatively
high atmospheric pressure; the
opposite of trough.
Click for More... WINDS 
  WILL GUSTGUST
(Abbrev. G) - A rapid fluctuation
of wind speed with variations of 10
knots or more between peaks and
lulls. 
Click for More... TO 60 MPH IN THE LAKE TAHOE AREA THU NIGHT...A LITTLE 
  LESS OVER MONO COUNTY RIDGES.  
   
  DUE TO TIMING INCONSISTENCIES IN TODAY`S MODELS...CURRENT HIGH 
  TEMPERATURE FORECASTS NEAR 60 FOR SOME VALLEYS IN EXTREME 
  WESTERN NV ON THANKSGIVING DAY WILL BE CONTINUED. IF THE WINDS 
  ALOFT DO INDEED DEVELOP MORE SLOWLY THAN FORECAST...HERE WILL BE 
  LESS MIXING AND HIGHS FOR THANKSGIVING MAY NOT GET OUT OF THE MIDMID
Middle
Click for More... 
  50S...OR THE DAYTIME HIGH WILL OCCUR LATE IN THE DAY. EITHER 
  WAY...THE WEATHER FOR THE AREA WILL BE PLEASANT FOR THIS TIME OF 
  YEAR. RC 
   
  .LONG TERM...SATURDAY THROUGH TUESDAY... 
   
  AFTER THE COLD FRONTCOLD FRONT
A zone separating two air masses,
of which the cooler, denser mass is
advancing and replacing the warmer.
Click for More... MOVES THROUGH FRIDAY...NORTH 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... ALOFT WILL  
  BRING SOME COLDER AIR INTO THE WESTERN STATES. ECEC
ECMWF Forecast Model
Click for More... BRINGS IN A  
  SECONDARY SHORTWAVESHORTWAVE
Also known as Shortwave Trough; a
disturbance in the mid or upper
part of the atmosphere which
induces upward motion ahead of it.
If other conditions are favorable,
the upward motion can contribute to
thunderstorm development ahead of a
shortwave.
Click for More... ON SATURDAY...WITH A SLIGHT CHANCE OF RAIN-SNOW  
  SHOWERS TO THE WESTERN NV VALLEYS. 
   
  A SURFACE HIGH PRESSURE BUILDS OVER THE GREAT BASINBASIN
An area having a common outlet for
its surface runoff. Also called a
"Drainage Basin."
Click for More... SAT-SUN. COLD  
  NORTH TO EAST 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... AT THE SURFACE IN OUR AREA...WILL KEEP  
  TEMPERATURES BELOW NORMAL THROUGH THE WEEKEND. THE RIDGERIDGE
An elongated area of relatively
high atmospheric pressure; the
opposite of trough.
Click for More... BUILDING  
  OVER THE WEST COAST WILL BE A BIG FACTOR IN HOW COLD WE GET AND HOW  
  LONG. MODELS LOOK TO BE TRENDING THE RIDGERIDGE
An elongated area of relatively
high atmospheric pressure; the
opposite of trough.
Click for More... INTO THE WEST COAST  
  FASTER...WITH TEMPERATURES COMING UP BY MONDAY. ON THE OTHER  
  HAND...THE 12Z ECMWFECMWF
European Center for Medium-Range
Weather Forecasts. Operational
references in forecast discussions
typically refer to the ECMWF's
medium-range numerical forecast
model, which runs out to 10 days.
Click for More... CONTINUES TO KEEP A MORE WESTERLY TRACKTRACK
The path that a storm or weather
system follows.
Click for More......WHICH  
  WOULD MEANMEAN
The arithmetic average of a set of
data (numbers), or the middle point
between its two extremes.
Click for More... STRONGER COLD AIR ADVECTIONADVECTION
(Abbrev. ADVCTN)- Transport of an
atmospheric property by the wind.
Click for More... AND NORTHERLY 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.... 
   
  DIDN`T REALLY MAKE MANY CHANGES TO THE LONG TERM FORECAST...BUT  
  RAISED TEMPSTEMPS
Temperatures
Click for More... A COUPLE DEGREES SUN-TUE TO ACCOUNT FOR RIDGERIDGE
An elongated area of relatively
high atmospheric pressure; the
opposite of trough.
Click for More... BUILDING  
  IN FASTER AS WE GO INTO NEXT WEEK. DRY AND COOL SEEMS TO BE THE NORM  
  THROUGH MIDWEEK NEXT WEEK.  HOON 
   
  && 
   
  .AVIATION... 
   
  HIGH PRESSURE OVER THE WEST THROUGH THANKSGIVING...WITH LIGHT WINDS  
  AND DRY CONDITIONS. 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... POSSIBLE AT TRUCKEE NEXT FEW NIGHTS...BUT  
  DRY AIR MAY KEEP THE 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... SHALLOW.  
   
  NO SIGNIFICANT IMPACTS FOR TRAVEL TO START OF THANKSGIVING WEEKEND.  
  SYSTEM FORECAST TO MOVE INTO THE WEST COAST THURSDAY NIGHT INTO  
  FRIDAY...SHOULD BRING AN INCREASE IN WINDS A CHANCE FOR RAIN/SNOW  
  SHOWERS NORTH OF KTVL-KRNO-KNFL.  HOON 
   
  && 
   
  .REV WATCHES/WARNINGS/ADVISORIES... 
  NV...NONE. 
  CACA
California
Click for More......NONE. 
  && 
   
  
 
   
  HTTP://WEATHER.GOV/RENO