FORECAST SUMMARY:

Monday, November 16th, 2020 through Monday, November 23rd, 2020

PM-2.5: 24-hour average Fine Particulate concentrations will be mostly Good through mid-week with levels ranging upper Good to middle Moderate the rest of the forecast period.

FORECAST DISCUSSION:

A weather system dropping in from the northwest Monday brings precipitation (mostly snow) in the forecast as the day progresses. After this system passes, high pressure builds in and a warmup is expected past mid-week.

Cool west/northwesterly winds should keep fine particulate in the Good range Monday and Tuesday. High pressure moves overhead, then east of the region, Wednesday. Winds decrease in speed Wednesday and change to more of a southerly direction. Stronger southwesterly winds Thursday and Friday will warm temperatures above seasonable levels. Warmer conditions coupled with southerly winds could allow for a fine particulate increase into the Moderate range.

EXTENDED FORECAST:

Extended forecast models show a frontal boundary setting up over the region this coming weekend. The exact placement is uncertain; however, increased moisture would bring precipitation back in the forecast. Winds may be lighter and with a boundary nearby, fine particulate will likely range from upper Good to middle Moderate.

Forecast Updated by Meteorologist Stephanie M. Hengesbach Monday, November 16th, 2020
Next forecast update: Monday, November 23rd, 2020