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Primary air pollutant in the Delmont area:
PM2.5 - 37 Good
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*** Current Conditions as of 2 PM on Monday: High pressure continues to dominate the weather pattern with another day of dry conditions. A warm front lifted northward earlier today which has turned the wind southerly and breezy. Unseasonably warm conditions are expected for Tuesday before a midweek cold front returns those temperatures back to near normal. Concentrations of fine particulate matter (PM-2.5) will mostly be inside the good range over this period with some moderate levels possible for a few hours on Tuesday. *** Tuesday’s Forecast: Temperatures may reach the low 80s on Tuesday, which would not only be a record high for the Pittsburgh area on that date but 80 degrees in November has only occurred a couple times on record. Highs are typically in the mid to upper 50s for the first week of November. With the surge of warm air over the region, a weak to moderate temperature inversion may develop during the overnight and morning hours on Tuesday. Breezy southerly flow will limit how far temperatures fall overnight where even the record high minimum temperature could be broken. This southerly flow will be quite gusty during the afternoon and evening hours to provide plenty of mixing. The high winds combined with the dry conditions will cause the wildfire risk to be elevated. As of Monday afternoon, there are no fires across the western portion of the state causing any air quality concerns. Highest hourly concentrations of PM-2.5 will be during the overnight to morning hours, until any inversion that develops breaks, but overall concentrations are expected to be in the high end of the good range on average for the day. *** Extended Outlook: Cloud cover will increase as we head into Wednesday. Once again, the record high minimum temperature may be close to being broken Wednesday morning. Chances for some much-needed showers will increase ahead of the approaching cold front. Unfortunately, any rain that falls is looking to be light and won’t have any impact on lessening the drought conditions. It has been a full month since Pittsburgh measured more than a tenth of an inch of rain in a day. With breezy conditions continuing and the chance for some precipitation, PM-2.5 concentrations will remain at levels inside the good range on Wednesday. Winds will become more northerly behind the front for Thursday as high pressure builds with good air quality continuing through at least the end of the week. The next best chance for precipitation will come over the weekend with hopefully more rainfall than Wednesday. --- Roble
Primary Pollutant: PM2.5 - 60 Moderate
Primary Pollutant: PM2.5 - 48 Good
Primary Pollutant: PM2.5 - 45 Good
Primary Pollutant: PM2.5 - 0 Good