DENSE FOG ADVISORY
Issue Date: 827 PM PST FRI DEC 04 2009
Expiration: 800 AM PST SAT DEC 05 2009

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM PST SATURDAY...
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
SATURDAY...
THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A DENSE FOG
ADVISORY...WHICH IS IN EFFECT UNTIL 8 AM PST SATURDAY. AN AIR
STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST SATURDAY.
A STRONG TEMPERATURE INVERSION CONTINUES WHICH HAS REDUCED
VISIBILITIES TO LESS THAN A QUARTER OF A MILE ACROSS MUCH OF THE
ILLINOIS AND ROGUE VALLEYS. THIS HAS ALSO TRAPPED POLLUTANTS NEAR
THE GROUND. CONDITIONS ARE EXPECTED TO IMPROVE BY LATE SATURDAY
MORNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW
DOWN...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL REMAIN
ELEVATED.
$$

AIR STAGNATION ADVISORY
Issue Date: 311 AM PST FRI DEC 04 2009
Expiration: 1000 AM PST SAT DEC 05 2009

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM PST THIS MORNING...
...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 10 AM PST
SATURDAY...
THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A DENSE FOG
ADVISORY...WHICH IS IN EFFECT UNTIL 9 AM PST THIS MORNING. THE
AIR STAGNATION ADVISORY IS NOW IN EFFECT UNTIL 10 AM PST
SATURDAY.
THE TEMPERATURE INVERSION CONTINUES OVER THE ILLINOIS AND ROGUE
VALLEYS WHICH WILL CONTRIBUTE TO DENSE FOG CONDITIONS FOR THE
MORNING COMMUTE AND WILL ALSO CONTINUE TO TRAP POLLUTANTS NEAR
GROUND LEVEL. CONDITIONS ARE EXPECTED TO IMPROVE MIDDAY TOMORROW
AS THE TEMPERATURE INVERSION OVER THE VALLEY WEAKENS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION WILL REMAIN
ELEVATED.
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE.
IF DRIVING...SLOW DOWN...USE YOUR HEADLIGHTS...AND LEAVE PLENTY
OF DISTANCE AHEAD OF YOU.
$$