AgWeatherNet Weekly Weather Outlook Monday Update for Mar 02 to Mar 08, 2020

Series of Canadian lows to bring unsettled weather

Mark Ingalls, AgWeatherNet Intern
Craig Oswald, Field Meteorologist, 509-786-9256


As light rain showers look to continue primarily throughout western Washington today. A train of low pressure systems still look poised to repeatedly approach the central British Columbia coast this week. These will drag with it two frontal passages, which are expected to reach Washington late Tuesday and again Thursday evening. The impacts from each of these passages during the forecast period will be remarkably similar. Expect light-to-moderate rain showers in Western Washington with modest snowfall in the Olympics and Cascades. East of the Cascades, these passages will be quite a bit drier, with scattered showers in the Okanogan and Blue Mountain regions, and isolated rain showers elsewhere. This includes possible upland snow at the higher elevations. Temperatures are expected to remain near to slightly above normal for the week, with dips slightly below normal in conjunction with the frontal passages.

West of and in the Cascades, there is a decent chance of precipitation Tuesday and Wednesday. Much of Thursday should be dry, before the second front begins to bring rain and mountain snow to areas west of Interstate 5 in the evening. East of the Cascades, the low precipitation chances come Tuesday and Wednesday. Expect gusty winds intermittently statewide throughout the forecast period.

Most of the state has a chance of light rain and mountain snow Friday as the Thursday evening cold front continues to work its way from northwest to southeast across the state. Western Washington is expected to cling to light rain showers and mountain snow showers through Friday while the greatest chances for precipitation for eastern Washington again lie within upland areas of northern Washington, where snow can be expected, as well as eastern and southeastern parts of the state with lowland rain and upland snow likely. Inland Washington will likely remain mostly dry with only a passing light rain shower or two expected. Scattered precipitation is anticipated to linger into Saturday with conditions trending dry statewide through the day and remaining so for Sunday.

Key Points:

  • Near to slightly above average statewide.
  • Near to slightly above average statewide.

  • Rain and mountain snow likely in and west of the Cascades Monday through Wednesday, as well as Thursday evening west of I-5.
  • Rain/snow and snow down to pass levels Wednesday and Thursday.-Mostly showery type rain/snow and upland snow for Washington east of the Cascades Tuesday and Wednesday.

  • Breezy conditions in the Cascades and Columbia Basin Monday, statewide Tuesday and Wednesday, and west of the Cascades Thursday.

South Central Washington
Through Friday
  • Isolated rain showers throughout the area Tuesday and Wednesday, with scattered showers Friday, otherwise dry. Breezy Monday through Wednesday. Partly cloudy to overcast.
  • Highs in the mid 50s to mid 60s.
  • Lows in the mid 30s to mid 40s.

North Central Washington
Through Friday
  • Possible rain and upland snow showers throughout mountainous areas Tuesday and Wednesday and again on Friday, otherwise dry. Partly cloudy to overcast.
  • Highs in the 50s. Cooler through higher terrain.
  • Lows in the 30s. Cooler through higher terrain.

Eastern Washington
Through Friday
  • Scattered showers Tuesday night and Wednesday and again on Friday, otherwise dry. Breezy in spots through Wednesday. Partly cloudy to overcast.
  • Highs in the 40s Monday, steadily rising to the mid to upper 50s for Thursday.
  • Lows in the upper 20s to mid 30s, except mid to upper 30s Wednesday morning. Warmer along the Snake River.

Western Washington
Through Friday
  • Return of light rain and light to moderate mountain snow showers Monday morning and remaining through the beginning of the week. Brief dry period likely before a more significant disturbance moves in around Thursday. Patchy fog at times. Mostly cloudy to overcast.
  • Highs in the upper 40s to mid 50s. Much cooler throughout the Cascades.
  • Lows in the upper 30s to low 40s. Much cooler throughout the Cascades.

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