FREEZING FOG ADVISORY
Warning Issue Date: 442 AM PST FRI DEC 25 2009
...FREEZING FOG ADVISORY IN EFFECT UNTIL NOON PST TODAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
SATURDAY...
...DENSE FOG ADVISORY IS CANCELLED...
THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A FREEZING
FOG ADVISORY...WHICH IS IN EFFECT UNTIL NOON PST TODAY. THE DENSE
FOG ADVISORY HAS BEEN CANCELLED. AN AIR STAGNATION ADVISORY
REMAINS IN EFFECT UNTIL 4 PM PST SATURDAY.
* A LAYER OF LOW STRATUS CLOUDS HAS SPREAD TO CENTRAL OREGON AND
HAS COME INTO CONTACT WITH THE RISING TERRAIN OF THE CENTRAL
OREGON PLATEAU FROM NEAR REDMOND SOUTHWARD. THIS IS CAUSING
AREAS OF DENSE FREEZING FOG...ESPECIALLY ON HIGHWAY 97 FROM
REDMOND TO BEND...OR FROM ELEVATIONS FROM ABOUT 2500 TO 4000
FEET.
* VISIBILITY OF ONE QUARTER OF A MILE OR LESS CAN BE EXPECTED AT
TIMES IN THESE AREAS.
* BELOW FREEZING TEMPERATURES ARE CAUSING FOG DROPLETS TO FREEZE
ON ROADWAYS AND OTHER SURFACES CAUSING SLICK CONDITIONS.
* THE STRATUS LAYER IS LIKELY CONTACTING THE HIGHER TERRAIN IN
OTHER AREAS OF CENTRAL AND EASTERN OREGON AS WELL AND IS CAUSING
LOWERED VISIBILITY AND SLICK ROAD SURFACE IN THOSE AREAS THAT
ARE BELOW FREEZING.
* AIR QUALITY WILL DETERIORATE IN VALLEYS AND BASINS DUE TO HIGH
PRESSURE LIMITING AIR MOVEMENT. THIS WILL CAUSE THE
ACCUMULATION OF PARTICULATE MATTER IN VALLEYS AND BASINS BELOW
3500 FEET.
* POOR AIR QUALITY WILL AFFECT PERSONS WITH RESPIRATORY PROBLEMS
AND PERSONS ENGAGED IN STRENUOUS OUTDOOR ACTIVITIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE.
CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE
RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION...
CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON.
A FREEZING FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO ONE QUARTER MILE OR LESS WITH TEMPERATURES AT OR BELOW
FREEZING. IF DRIVING...SLOW DOWN...USE YOUR HEADLIGHTS...AND
LEAVE PLENTY OF DISTANCE AHEAD OF YOU. ALSO...BE ALERT FOR ICE
FORMING ON ROADWAYS...BRIDGES AND OVERPASSES. FOR ADDITIONAL
WEATHER INFORMATION...CHECK OUR WEB SITE AT
WWW.WEATHER.GOV/PENDLETON.
$$
AIR STAGNATION ADVISORY
Warning Issue Date: 442 AM PST FRI DEC 25 2009
...FREEZING FOG ADVISORY IN EFFECT UNTIL NOON PST TODAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
SATURDAY...
...DENSE FOG ADVISORY IS CANCELLED...
THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A FREEZING
FOG ADVISORY...WHICH IS IN EFFECT UNTIL NOON PST TODAY. THE DENSE
FOG ADVISORY HAS BEEN CANCELLED. AN AIR STAGNATION ADVISORY
REMAINS IN EFFECT UNTIL 4 PM PST SATURDAY.
* A LAYER OF LOW STRATUS CLOUDS HAS SPREAD TO CENTRAL OREGON AND
HAS COME INTO CONTACT WITH THE RISING TERRAIN OF THE CENTRAL
OREGON PLATEAU FROM NEAR REDMOND SOUTHWARD. THIS IS CAUSING
AREAS OF DENSE FREEZING FOG...ESPECIALLY ON HIGHWAY 97 FROM
REDMOND TO BEND...OR FROM ELEVATIONS FROM ABOUT 2500 TO 4000
FEET.
* VISIBILITY OF ONE QUARTER OF A MILE OR LESS CAN BE EXPECTED AT
TIMES IN THESE AREAS.
* BELOW FREEZING TEMPERATURES ARE CAUSING FOG DROPLETS TO FREEZE
ON ROADWAYS AND OTHER SURFACES CAUSING SLICK CONDITIONS.
* THE STRATUS LAYER IS LIKELY CONTACTING THE HIGHER TERRAIN IN
OTHER AREAS OF CENTRAL AND EASTERN OREGON AS WELL AND IS CAUSING
LOWERED VISIBILITY AND SLICK ROAD SURFACE IN THOSE AREAS THAT
ARE BELOW FREEZING.
* AIR QUALITY WILL DETERIORATE IN VALLEYS AND BASINS DUE TO HIGH
PRESSURE LIMITING AIR MOVEMENT. THIS WILL CAUSE THE
ACCUMULATION OF PARTICULATE MATTER IN VALLEYS AND BASINS BELOW
3500 FEET.
* POOR AIR QUALITY WILL AFFECT PERSONS WITH RESPIRATORY PROBLEMS
AND PERSONS ENGAGED IN STRENUOUS OUTDOOR ACTIVITIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE.
CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE
RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION...
CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON.
A FREEZING FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO ONE QUARTER MILE OR LESS WITH TEMPERATURES AT OR BELOW
FREEZING. IF DRIVING...SLOW DOWN...USE YOUR HEADLIGHTS...AND
LEAVE PLENTY OF DISTANCE AHEAD OF YOU. ALSO...BE ALERT FOR ICE
FORMING ON ROADWAYS...BRIDGES AND OVERPASSES. FOR ADDITIONAL
WEATHER INFORMATION...CHECK OUR WEB SITE AT
WWW.WEATHER.GOV/PENDLETON.
$$
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