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.
Sunday, January 19, 2014
Mostly Sunny with patchy morning fog and a slow warming trend
MON: Patchy morning fog then Partly Cloudy, morning low temperature in the upper 20s, afternoon high temperature in the upper 30s.
TUE: Patchy morning fog the Partly Sunny, morning low upper 20s afternoon highs mid 30s.
WED: Partly Cloudy, morning low near 30 degrees, afternoon high low 40s.
THURS: Patchy morning fog then Partly Sunny, morning low near 30, afternoon high low 40s.
FRI: Patchy morning fog then Mostly Sunny, lows upper 20s, highs near 40.SAT & SUN: Sunny, lows near freezing, highs mid to upper 40s.
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