AgWeatherNet Weekly Weather Outlook for September 2 to September 8, 2017

Hot and Dry Through the Period

Nic Loyd, Meteorologist, 509-786-9357

The Labor Day Holiday Weekend and next week will be characterized by hot, dry, hazy, and rather calm conditions, as a large ridge of high pressure delivers an early September heat wave to Washington. The main concerns will be potentially record-breaking temperatures, and also the region-wide extent and prolonged duration of the event. In fact, during the mid to latter part of next week, Washington looks to be much warmer than the Deep South.

Here are some anticipated peak temperatures by region:
-Interior Western WA: Mid 80s to 90s, except near 100 degrees for Vancouver
-Coast: 80s
-Central WA: Low 100s
-Eastern WA: Near 100

Although no major pattern shifts are apparent in the coming seven days, subtle circulation changes are likely to occur at times. Depending upon fire activity and wind patterns, smoke should continue to be a periodic issue for many areas. As the ridge amplifies over the Northwest early next week, cool air pouring into the Upper Midwest may induce a northeasterly pressure gradient across Washington. This type of flow could enhance warming in western parts of the state, while simultaneously bringing the slightest hint of cooling to eastern locales. Following a hot mid week interval, the west can expect modest cooling late in the period.

Given the time of year, the most critical point about this week’s weather is not the magnitude of the forecast heat in terms of extreme temperatures, but rather the widespread and long lasting nature of the heat wave. This persistent low frequency circulation pattern of hot Northwest weather must end eventually, although it is not clear when that may occur.


Temperatures
  • Generally very hot.
  • Possibly cooler in the west later next week.

Precipitation
  • Mostly dry.
  • A slight chance of mountain thunderstorms later next week.

Wind
  • Generally light, with modest breezes possible early next week, and again late in the period.

8 to 14 Day Outlook - September 9, 2017 to September 15, 2017
  • Overall, above average temperatures and 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 80s and lows in the upper 40s to 50s.
Weekend
  • Mostly dry.
  • Highs in the mid 90s to low 100s on Saturday, and mid 90s to mid 100s on Sunday.
  • Lows in the 50s to mid 60s on Saturday morning, and mid 50s to 60s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 90s to low 100s early, and then warmer, and possibly cooler later in the week.
  • Lows in the 60s.

North Central Washington
  • Normal conditions for this time of the year would be highs in the low to mid 80s and lows in the 50s.
Weekend
  • Mostly dry.
  • Highs in the mid to upper 90s on Saturday, and mid 90s to low 100s on Sunday.
  • Lows in the mid 50s to 60s on Saturday morning, and 60s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 90s to around 100 early, and then warmer, and possibly cooler later in the week.
  • Lows in the 60s to low 70s.

Eastern 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 mid to upper 90s on Saturday, and mid 90s to low 100s on Sunday.
  • Lows in the 50s to low 60s on Saturday morning, and mid 50s to mid 60s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid to upper 90s early, and then warmer, and possibly cooler later in the week.
  • Lows in the mid 50s to 60s early, 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 low to mid 70s and lows in the upper 40s to low 50s.
Weekend
  • Mostly dry.
  • Highs in the 80s to 90s, except possibly cooler at the coast on Sunday.
  • Lows in the 50s to low 60s on Saturday morning, and mid 50s to mid 60s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 80s to 90s on Monday (except cooler at the coast), and then warmer, and cooler later in the week.
  • Lows in the mid 50s to mid 60s on Monday morning, and then warmer, and possibly cooler later in the week.


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