News & Events

October 23 Air Quality (PM2.5) Forecast

Wednesday, October 22, 2008

Thursday, October 23, 2008:
Fine Particulates (PM 2.5) – Code GREEN

Regional Maximum PM 2.5 Concentrations:
Tuesday, October 21, 2008:
PM 2.5 –GREEN (35 AQI or 10.9 µg/m3)

Short-Term Discussion: High pressure is continuing to build into the region from the north. The pressure difference between this high and low pressure located off the Canadian Maritimes is continuing to make winds rather brisk from the northwest yet again this afternoon. Sunshine has also been hard pressed to poke through the clouds. Temperatures will be hard pressed to make it out of the upper 40s in many locales. The brisk winds have been beneficial in the fact particulate levels remain very low.

Tonight, expect some clearing with lighter winds. This will allow temperatures to drop to near the 30 degree mark in numerous places, with middle 20s possible in the coldest spots.

Expect a little more sunshine tomorrow as the high comes closer to us, with temperatures reaching into the lower and middle 50s. Overall fine particulate air quality should be in the code GREEN range.

Clear and frosty cold tomorrow night with low temperatures dipping down into the middle and upper 20s by sunup.

Extended: Tranquil weather will continue into the day Friday, with a fair amount of sunshine. Afternoon temperatures should rebound close to 60. A little more moisture will be present, and could possibly cause fine particulate to go into the lower code YELLOW range in a few places, but most places probably stay good. Also on Friday, a storm will get it’s act together across the lower Mississippi valley, and will then make a march towards us Saturday into Saturday night. This storm will bring the most significant rainfall we have had in almost a month. Sunday looks a little better with perhaps some sunshine returning and just the chance for a shower. A shower or two is possible Monday as a weak storm may try and develop just off the east coast. Tuesday looks to be very chilly with temperatures perhaps not getting out of the 40s. Snow flurries are not out of the question Monday night across the Poconos. Overall air quality should remain good over the weekend into early next week.

Michael McAuliffe
Air Quality Specialist/Meteorologist
PA DEP Bureau of Air Quality