AgWeatherNet Weekly Weather Outlook for Jan 24 to Jan 30, 2020

Continuation of unsettled weather with a few glances of sunshine mixed in

Craig Oswald, Field Meteorologist, 509-786-9256
Joe Zagrodnik, Postdoctoral Research Associate

Discussion:

This week looks to bring a continued pattern of unsettled weather. A respectable and persistent Aleutian low located along the southern shores of Alaska looks to maintain a generally zonal (west to east) flow regime across the north Pacific. Embedded short waves within this larger flow regime are expected to generate modest surface disturbances/circulations that are anticipated to systematically impact primarily the British Columbia coast through the period. This again looks to place Washington state in a position to be impacted by bands of precipitation formed in conjunction with these disturbances/circulations. The precipitation bands are expected to enter and move through the state from the west/southwest. A few glances at mostly sunny skies are also anticipated in between the series of precipitation bands, mostly for those of us located east of the Cascades. Our friends west of the Cascades will lead a slightly drearier week as is usually the case this time of year.

With slightly above average temperatures anticipated through the outlook period, almost all the precipitation that falls will be in liquid form. Snow levels through the central Cascades and Olympics will be hard pressed to reach pass level (approx. 3000ft) during the overnights and primarily a rain/snow mix is expected with only modest snow accumulations at times beginning Sunday night and into early next week. Elevations approx. 5000-5500ft+ however will see a few inches of snow accumulation every day. Northern Washington looks to see snow levels dip as low as 1500ft during the overnights through the course of the period. Again, this is expected to be constituted as a rain/snow mix with only modest accumulations at times. Upland areas are anticipated to receive light snow accumulations daily.

With significant rainfall and snow melt over the past week in western Washington, landslide risk will remain elevated through the weekend. Additionally, strong winds are possible along the Pacific coast and in favored portions of interior Puget Sound both on Sunday and potentially mid-next week depending on the track of the surface circulations.

Finally, the streak of consecutive days with measurable rainfall has reached 38 at Quillayute Airport, tied for the second longest streak on record (records began in 1966). With rain expected every day in the next week, the record of 47 consecutive days from Nov-Dec 1990 may be in jeopardy.


Key Points:

  • Continued unsettled weather statewide with extended periods of precip and brief windows of dry weather.
  • Temps generally sitting a couple of degrees above average.

Temperatures
  • Temps generally holding steady for the week.

Precipitation
  • Mostly rain type precip with a chance for mixed type precip at times.
  • Snow for parts of upland northern Washington and the Cascades/Olympics. Generally modest accumulations except for the highest elevations (5000-5500ft+)

Wind
  • Light winds expected with some breezy gusts, primarily through the Basin/Palouse and western Washington, especially the Puget Sound area.

8 to 14 Day Outlook - Jan 31, 2020 to Feb 6, 2020
  • Near to slightly above average temperatures and slightly above average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week's Weather

South Central Washington
Weekend
  • Periods of light rain. Patchy fog expected at times. Mostly sunny to overcast.
  • Highs in the mid 50s Friday, low 50s Saturday, and mid 50s Sunday.
  • Lows in the upper 30s Saturday morning, and low 40s Sunday morning.
Next Week
  • Periods of light rain. Brief window of dry weather possible in the Tuesday time frame. Mostly sunny to overcast.
  • Highs in the low 50s Monday and holding. Mid 50s by Thursday.
  • Lows in the low 40s Monday morning and holding.

North Central Washington
Weekend
  • Periods of light rain/mixed precip and upland snow with modest accumulations. Patchy fog expected at times. Mostly sunny to overcast.
  • Highs in the low 40s Friday, upper 30s Saturday, near 40 Sunday. Cooler throughout higher terrain.
  • Lows in the low 30s Saturday morning, and mid 30s Sunday morning. Cooler throughout higher terrain.
Next Week
  • Periods of light rain/mixed/snow and upland snow with modest accumulations. Significant lowland snow accumulations not anticipated. Patchy fog likely through much of the week. Brief window of dry weather possible in the Tuesday time frame. Mostly sunny to overcast.
  • Highs near 40 Monday and dipping to upper 30s. Back to near 40 Thursday. Cooler throughout higher terrain.
  • Lows in the low 30s Monday morning and dipping to near 30. Back to low 30s Thursday morning. Cooler throughout higher terrain.

Eastern Washington
Weekend
  • Periods of light rain with some rain/mixed/snow type precip possible Sunday night. No significant snow accumulations. Low threat for patchy fog. Mostly sunny to overcast.
  • Highs in the mid 40s Friday, low 40s Saturday, and mid 40s Sunday.
  • Lows in the low 30s Saturday morning, and mid 30s Sunday morning.
Next Week
  • Periods of light rain/mixed/snow. Significant snow accumulations not anticipated. Mostly sunny to overcast.
  • Highs in the low 40s Monday and holding for the week. Back up to mid 40s Thursday.
  • Lows in the mid 30s Monday morning and holding for the week.

Western Washington
Weekend
  • Extended periods of light to moderate rain and light to moderate mountain snow. Snow expected to remain above pass levels until Sunday night with rain/snow mix likely with only modest snow accumulations. Patchy fog at times. Partly sunny to overcast.
  • Highs near 50 Friday, low 50s Saturday, and near 50 Sunday. Much cooler throughout the mountains.
  • Lows in the mid 40s Saturday and Sunday mornings. Much cooler throughout the mountains.
Next Week
  • Extended periods of light to moderate rain showers. Light to moderate snow showers through the Cascades. Rain/snow mix likely at pass level early in the week trending to rain with only modest snow accumulations. Patchy fog at times. Partly sunny to overcast.
  • Highs in the mid 40s Monday climbing to low 50s by Thursday. Much cooler throughout the Cascades.
  • Lows in the low 40s Monday morning and holding for the week. Mid 40s Thursday morning. Much cooler throughout the Cascades.

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