URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
SUN JAN 19 2014

...STAGNANT CONDITIONS EXPECTED THIS WEEK...

STRONG HIGH PRESSURE FORMED OVER THE INLAND NORTHWEST LAST
WEDNESDAY. SINCE THEN...WINDS HAVE BEEN LIGHT AND THE ATMOSPHERE
HAS BEEN VERY STABLE. WIDESPREAD FOG AND LOW CLOUDS HAVE FILLED
THE VALLEYS OF CENTRAL AND EASTERN WASHINGTON...AS WELL AS THE
VALLEYS OF FAR NORTH IDAHO. STRONG HIGH PRESSURE WILL LIKELY
PERSIST THROUGH THE END OF THE WEEK. AN UPPER LEVEL DISTURBANCE ON
WEDNESDAY HAS THE POTENTIAL TO WEAKEN THE INVERSION BRIEFLY...BUT
IT APPEARS THAT STRONG HIGH PRESSURE WILL RETURN FOR THE END OF
THE WEEK.


AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM FRIDAY

* AIR QUALITY: LIGHT WINDS AND STABLE CONDITIONS WILL INCREASE
  THE POTENTIAL FOR THE BUILD UP OF POLLUTANTS NEAR THE GROUND.

* TIMING: THROUGH FRIDAY MORNING. AN UPPER LEVEL DISTURBANCE MAY
  WEAKEN THE INVERSION TEMPORARILY ON WEDNESDAY...BUT THE STRONG
  INVERSION IS EXPECTED TO RETURN THURSDAY AND FRIDAY.

* IMPACTS: PROLONGED PERIODS OF STAGNANT AIR CAN HOLD FINE
  PARTICULATES CLOSE TO THE GROUND AND DEGRADE AIR QUALITY.

* WEB PAGE: FOR A DETAILED VIEW OF THE HAZARD AREA VISIT
  HTTP://WWW.WRH.NOAA.GOV/WRH/WHV/?WFO=OTX

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION HAS THE
POTENTIAL TO INCREASE TO DANGEROUS LEVELS. PERSONS WITH
RESPIRATORY ILLNESS SHOULD FOLLOW THEIR PHYSICIANS ADVICE FOR
DEALING WITH HIGH LEVELS OF AIR POLLUTION.