AgWeatherNet Weekly Weather Outlook for Jan 17 to Jan 23, 2020

A return to seasonal temperatures with more chances for precipitation

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

Discussion:

Compared to last week's wild ride with mother nature, this week is expected to be a little bit more mundane. This doesn't mean that we will have clear skies abound, but rather that an unsettled weather pattern looks to remain in place with the impacts being more manageable. Some will also be pleased to know that after last week's test of the quality of your winter coat, Washington State is anticipated to continue along a slight warming trend through the weekend with temperatures generally hanging near average by Sunday and remaining so through the week.

The main weather makers for the outlook period look to be the precipitation bands associated with two, arguably three, surface cyclones. Through the course of the weekend and early next week these systems look to impact various parts of the British Columbia coast with the broad precipitation bands associated with their cold fronts expected to impact Washington generally from the west/southwest. This will bring unsettled weather throughout the state with mostly showery type precipitation that can go on for extended periods at times. For the most part, precipitation type looks to be snow through the mountains and upland areas and rain/mixed throughout lowland areas thanks again to the slow warming of temperatures to near normal through the weekend.

Sunday looks to be mostly dry except on the Olympic Peninsula as Washington will be between precipitation bands. As we move into the week, another frontal system is expected to pass across the state in the Tuesday-Wednesday timeframe although as of this time the weather models do not agree on the timing or extent of precipitation. Otherwise, most of the state east of the Cascades looks to be relatively dry with even a few peeks of sun likely. Our friends west of the Cascades however will likely cling to dreary conditions.

Some of the few hazards to be aware of during the upcoming period include extended periods of snowfall through the Cascades with decent accumulations down to pass levels. Around a foot of snow is likely for near Snoqualmie Pass through the weekend for example. There also looks to be breezy conditions at times, primarily near coastal regions, through the weekend and first part of the week as the remnant frontal boundaries, associated with the series of surface cyclones, move into Washington State.

The recent snowfall has considerably increased the mountain snowpack with most areas now reporting 80-100% of normal. 7-day mountain pass snowfall totals (via WSDOT) include 28" at Blewett Pass, 65" at White Pass, 78" at Stevens Pass, and 83" at Snoqualmie Pass. Other official totals (via NWS) include 16.9" at Spokane and 0.7" of snow at Sea-Tac. Around 2-3" fell in Yakima and 3-6" in Wenatchee (via CoCoRaHS). Some of the most impressive lowland snowfall totals occurred in the Port Angeles area (up to 2 feet) and in Whatcom/Skagit counties (7-15"). A few interesting rainfall statistics include 14 consecutive days of rain at Sea-Tac from Jan 2-15 and Quillayute airport on the Pacific Coast has an ongoing streak of 31 straight days with measurable rain.


Key Points:

  • Unsettled weather statewide. Mostly showery type precip with generally high terrain/upland snow and lowland rain/mixed showers.
  • Temps return to near average by Sunday.

Temperatures
  • Near seasonal temperatures by Sunday.
  • Temps holding for the week.

Precipitation
  • Statewide rain/mixed/snow showers for the first half of the weekend.
  • Return of showery rain/mixed/snow early in the week with drying trend by mid week.

Wind
  • Breezy at times near the coast and through the Cascades but remaining generally light statewide.

8 to 14 Day Outlook - Jan 24, 2020 to Jan 30, 2020
  • Near to slightly above average temperatures and near to 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
  • Light rain/mixed expected with light snow through upland areas. Minimal snow accumulations. Dry conditions anticipated by early Sunday morning. Partly sunny to overcast.
  • Highs in the mid 30s Friday, near 40 Saturday, and low 40s Sunday.
  • Lows in the upper 20s Saturday morning, and low 30s Sunday morning.
Next Week
  • Chance for an occasional rain/mixed shower and upland snow shower early in the week before becoming dry mid week. Partly sunny to overcast.
  • Highs near 40 Monday climbing to the mid 40s by weeks end.
  • Lows near 30 Monday climbing to the mid 30s by weeks end.

North Central Washington
Weekend
  • Light to moderate snow expected with a few inches of accumulation. Mostly dry conditions anticipated by early/mid morning Sunday. Mostly cloudy to overcast.
  • Highs in the upper 20s Friday, low 30s Saturday, mid 30s Sunday. Cooler throughout higher terrain.
  • Lows near 20 Saturday morning, and upper 20s Sunday morning. Cooler throughout higher terrain.
Next Week
  • Light to moderate snow showers at times early in the week. Trending dry mid week with a low chance for a passing snow shower through weeks end. Partly sunny to overcast.
  • Highs in the upper 30s Monday climbing to upper 30s by weeks end. Cooler throughout higher terrain.
  • Lows in the low 30s Monday morning and remaining through the week. Cooler throughout higher terrain.

Eastern Washington
Weekend
  • Light to moderate snow expected with rain/mixed through some lowland areas. Modest snow accumulations. Mostly dry conditions anticipated by early morning Sunday. Mostly cloudy to overcast.
  • Highs near 30 Friday, low 30s Saturday, and upper 30s Sunday.
  • Lows in the low 20s Saturday morning, and near 30 Sunday morning.
Next Week
  • Light to moderate rain/mixed/snow showers at times. Trending dry near the end of the outlook period. Partly sunny to overcast.
  • Highs in the upper 30s Monday and slightly cooling to mid 30s by weeks end.
  • Lows in the upper 20s Monday morning and slightly warming to near 30 for the remainder of the week.

Western Washington
Weekend
  • Light to moderate rain and light to moderate high terrain snow. Precip gradually tapering off through the day Sunday. Snow accumulations of a foot down to pass level. Mostly cloudy to overcast.
  • Highs in the low 40s Friday, mid 40s Saturday, and upper 40s Sunday. Much cooler throughout the mountains.
  • Lows in the upper 30s Saturday morning, and low 40s Sunday morning. Much cooler throughout the mountains.
Next Week
  • Extended periods of light to moderate rain showers. Light to moderate snow showers through the Cascades. Showers to linger for the week. Partly sunny to overcast.
  • Highs in the mid 40s Monday climbing to upper 40s by weeks end. Much cooler throughout the Cascades.
  • Lows near 40 Monday morning and slightly dipping to upper 30s for the remainder of the week. Much cooler throughout the Cascades.

  • Like us on Facebook at https://www.facebook.com/AgWeatherNet
    Follow us on Twitter at https://www.twitter.com/AgWeatherNet
Washington State University