AgWeatherNet Weekly Weather Outlook for September 9 to September 15, 2017

Periodic Air Quality Relief on the Way

Nic Loyd, Meteorologist, 509-786-9357

A weather system brushing the state this weekend will cause a welcome improvement in air quality and visibility. However, despite the breezes and air mass exchange, the long term smoke/haze situation will not be fully resolved until the western North American wildfires are extinguished and the smoke source is eliminated. Saturday’s cooler and fresher air mass may not decrease high temperatures to the full potential since the clearing skies will mean increased solar radiation relative to recent smoky days.

As the disturbance clips the northern part of Washington, some clouds and western showers are likely for the start of the weekend. Sunday morning should be rather pleasant, with relatively cool temperatures compared to recent months. However, another ridge of high pressure is expected to build across the Northwest early next week, as warm, dry, and calm conditions return to the region.

As always, the fire/smoke situation will be difficult to predict. Working from the premise that the smoke and haze has been worse than anticipated, I expect a notable deterioration of air quality at that time. Luckily, a breezy weather system could bring another interval of at least temporary smoke and heat relief later in the period. Although temperatures should generally be near to above normal in the coming days, at least we seem to be entering a more variable regime. As a result, there look to be periodic respites from the heat and smoke. Unfortunately, the smoke this summer has exhibited similar behavior to Bob Wiley. Just when you think you are rid of it, it returns once again. In any case, Washington’s mid-September weather may not be ideal, but it should be better than it has been.


Temperatures
  • Cooler this weekend, and warmer early next week.
  • Cooler later next week.

Precipitation
  • A chance of rain in western areas on Saturday.
  • A slight chance of rain later next week.

Wind
  • Breezy on Saturday and into Sunday morning, and again later next week.

8 to 14 Day Outlook - September 16, 2017 to September 22, 2017
  • Overall, near to above average temperatures and near to below average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week’s Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the upper 70s to mid 80s and lows in the mid 40s to mid 50s.
Weekend
  • Mostly dry.
  • Highs in the upper 70s to mid 80s.
  • Lows in the mid 50s to mid 60s on Saturday morning, and upper 40s to mid 50s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid to upper 80s on Monday, and then warmer, and cooler later in the week.
  • Lows in the mid 40s to mid 50s on Monday morning, and then warmer, and possibly cooler later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 70s to low 80s and lows in the upper 40s to mid 50s.
Weekend
  • Mostly dry.
  • Highs in the mid 70s to low 80s on Saturday, and mid 70s to mid 80s on Sunday.
  • Lows in the upper 50s to mid 60s on Saturday morning, and low to mid 50s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid to upper 80s on Monday, and then warmer, and cooler later in the week.
  • Lows in the 50s on Monday morning, and then warmer, and possibly cooler later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the mid 70s to low 80s and lows in the mid 40s to low 50s.
Weekend
  • Mostly dry.
  • Highs in the upper 70s to mid 80s on Saturday, and mid 70s to low 80s on Sunday.
  • Lows in the mid 50s to mid 60s on Saturday morning, and upper 40s to mid 50s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the 80s on Monday, and then warmer, and cooler later in the week.
  • Lows in the mid 40s to low 50s on Monday morning, and then warmer, and possibly cooler later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the upper 60s to mid 70s and lows in the upper 40s to low 50s.
Weekend
  • A chance of rain on Saturday, especially in the north.
  • Highs in the 60s to low 70s on Saturday, and 70s to low 80s on Sunday.
  • Lows in the 50s to around 60 on Saturday morning, and low to mid 50s on Sunday morning.
Next Week
  • Mostly dry. A slight chance of rain later in the week.
  • Highs in the mid 70s to around 90 early, and cooler later in the week.
  • Lows in the mid 40s to mid 50s on Monday morning, and then warmer, and cooler later in the week.


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