What does this mean for observing? Good or bad? *Number of Active Alerts:* *1* *Go to alert detail: 1 * There is *1* active alert issued by the National Weather Service for 85323 ALERT 1 - Non Precipitation Advisory AIR STAGNATION ADVISORY IN EFFECT FOR THE VALLEYS OF SOUTHWEST AND SOUTH-CENTRAL ARIZONAINCLUDING THE PHOENIX METRO AREAUNTIL 1000 AM MST SUNDAY MORNING UNTIL 4:00PM MST *Issue Time:* 6:03AM MST, Saturday Jan 15, 2005 *Valid Until:* 4:00PM MST, Saturday Jan 15, 2005 Back to summary <http://deskwx.weatherbug.com/SevereWeather/SevereWeather.html?lvl=0&zcode=$$PC$$&curr_tab=1&zip=$$ZIPCODE$$&alert_state=AZ&_KWS_Nav1=SW_KWE_&_KWS_Nav2=SW_LocalAlerts_KWE_> *AIR STAGNATION ADVISORY IN EFFECT FOR THE VALLEYS OF SOUTHWEST AND SOUTH-CENTRAL ARIZONAINCLUDING THE PHOENIX METRO AREAUNTIL 1000 AM MST SUNDAY MORNING UNTIL 4:00PM MST* Air Stagnation Advisory National Weather Service Phoenix AZ 603 AM MST Sat Jan 15 2005 2300- Greater Phoenix Area-Northwest And North Central Pinal County- Northwest Maricopa County- Southern Gila County/Tonto National Forest Foothills- Southwest Deserts-Southwest Maricopa County-West Central Deserts- Including The Cities Of... Apache Junction... Casa Grande... Coolidge... Florence... Bouse... Quartzsite... Salome... Buckeye... Carefree... Cave Creek... Chandler... Fountain Hills... Gilbert... Glendale... Mesa... Peoria... Phoenix... Scottsdale... Sun City... Tempe... Dateland... Tacna... Wellton... Gila Bend... Globe... Miami... San Carlos And Superior... Also Including Apache... Bartlett... Canyon... Horseshoe... Roosevelt... And Saguaro Lakes... Morristown... New River... Tonopah... Wickenburg... Lake Pleasant 603 AM MST Sat Jan 15 2005 ... Air Stagnation Advisory In Effect For The Valleys Of Southwest And South-Central Arizona... Including The Phoenix Metro Area... Until 1000 AM MST Sunday Morning... High Pressure Will Continue To Shift Into The Southwest States The Next Few Days. The Combination Of Stable Conditions And Light Winds Will Lead To Marginal Ventilation Today Into Sunday Morning Over The Valleys Of Southwest And South-Central Arizona... East Of The Colorado River Valley. Thus An Air Stagnation Advisory Is In Effect Until 1000 AM Sunday Morning. Somewhat Stronger Winds And Deeper Mixing Heights Are Anticipated To Develop During The Day Sunday Which May Be Sufficient To Avoid Stagnant Conditions. Please Note That An Air Stagnation Advisory Is Based On Meteorological Conditions And Is Not An Air Pollution Advisory Or Forecast. Air Pollution Advisories And Forecasts Are Issued By County And State Air Quality Departments. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.