AgWeatherNet Weekly Weather Outlook for Mar 20 to Mar 26, 2020

A mild weekend followed by slightly below normal temps for the week and an unsettled weather pattern

Craig Oswald, Field Meteorologist, 509-786-9256
Joe Zagrodnik, Postdoctoral Research Associate
Mark Ingalls, AgWeatherNet Intern

Discussion:

This period's weather looks to be defined by a pleasant weekend for outdoor work, followed by unsettled weather and a slightly cooler than average week. Slightly warmer than average temperatures and mostly sunny/clear skies are expected for most of the weekend. A weak disturbance associated with a passing shortwave trough is anticipated to begin moving into Washington state from the northwest Sunday night. This disturbance looks to bring light widespread rain and mountain snow to western Washington with generally light accumulations expected at pass levels. Mostly scattered lowland rain and upland snow showers are expected for eastern Washington.

Conditions look to slowly trend dry through Tuesday night yet remain unsettled through mid-week with scattered showers anticipated through western Washington and the low threat for a stray shower or two throughout eastern Washington.

The next disturbance, again associated with another passing shortwave, looks to bring another round of showers into Washington from the northwest on Thursday. Effects look to be very similar to Sunday night's disturbance and precipitation looks to briefly trend more scattered for western Washington with a low threat for a stray shower in eastern Washington Friday. Showers are anticipated to pick up again Friday night.

A bit of cooler air looks to fill in behind the passing disturbance Sunday, dropping temperatures through the state slightly below normal for the remainder of the week. Minimum temperatures in lowland areas do not look to drop below the low 30s through the outlook period. However, this looks to be cold enough to flirt with the 10% bud kill threshold for some budding pit fruits like cherries and apricots in areas in southern and central Washington and precautions/mitigation may need to be taken in some locales.

A nighttime radiative inversion is likely for Friday and Saturday nights with the possibility of slightly colder than forecasted air pooling in very localized low-lying areas. With the increase in winds and cloud cover expected with the passing disturbance Sunday night, boundary layer conditions look to remain better mixed with less chance for long wave radiation to escape with the added cloud cover. The unsettled weather that is expected to remain through the week looks to keep any major inversion worries at bay, but this will be reassessed in the Monday update.



8 to 14 Day Outlook - Mar 27, 2020 to Apr 2, 2020
  • Likely below 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
  • Wind: Breezy conditions Friday and Saturday coming across Snoqualmie Pass and into the Kittitas Valley with gusts to 25 mph. Flow from the southwest will bring breezy conditions to the Columbia Basin Sunday with gusts to 30 mph. Generally light elsewhere.
  • Precipitation: No precipitation expected.
  • High Temps: Low 60s Friday, mid 60s Saturday, mid 60s Sunday.
  • Low Temps: Low 30s Friday night, low 30s Saturday night, low 40s Sunday night.
  • Sky Cover: Mostly sunny Friday and Saturday with increased clouds Sunday, especially near the Blue and Cascade Mountains. Hazy conditions possible.
Next Week
  • Wind: Breezy conditions with a SW flow on Monday with gusts ranging from around 20 mph around Yakima to possibly up to 35 mph in and near the Horse Heaven Hills. Widespread breezy conditions possible Wednesday.
  • Precipitation: A chance of rain showers and upland snow beginning Tuesday lasting through Thursday.
  • High Temps: Low 60s Monday, upper 50s Tuesday, upper 50s Wednesday, upper 50s Thursday.
  • Low Temps: Mid 30s Monday night, low 30s Tuesday night, mid 30s Wednesday night, near 40 Thursday night.
  • Sky Cover: Partly to mostly cloudy Monday through Thursday, with some areas around the Tri-Cities and Othello trending toward partly cloudy conditions Tuesday.

North Central Washington
Weekend
  • Wind: Remaining generally light and variable with breezy SW winds possible Sunday, especially on ridge tops and in other exposed areas.
  • Precipitation: A low chance of rain and upland snow in mountainous regions Sunday, otherwise dry.
  • High Temps: Upper 50s Friday, upper 50s Saturday, mid 50s Sunday. Cooler in higher terrain.
  • Low Temps: Near 30 Friday night, low 30s Saturday night, mid 30s Sunday night. Cooler in higher terrain and in valleys where strong nighttime inversions are common.
  • Sky Cover: Clear to partly cloudy Friday and Saturday, increasing to mostly cloudy to overcast Sunday. Hazy conditions possible.
Next Week
  • Wind: Breezy conditions in exposed upland areas Monday through Thursday. Widespread breezy conditions possible Wednesday.
  • Precipitation: Low chances of rain showers in the lowlands through the week, with light snow possible during morning hours. Moderate chances of rain and upland snow in mountainous regions through the week. Little-to-no accumulation expected.
  • High Temps: Low 50s Monday, near 50 Tuesday, near 50 Wednesday, low 50s Thursday. Cooler in higher terrain.
  • Low Temps: Low 30s Monday night, near 30 Tuesday night, low 30s Wednesday night, mid 30s Thursday night. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy to overcast Monday through Thursday. Partly cloudy conditions possible in lowland areas Wednesday.

Eastern Washington
Weekend
  • Wind: Remaining light and variable for the first part of the weekend. A bit breezier through the Palouse with SW winds increasing Sunday, gusts up to 35 mph possible.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 50s Friday, mid 50s Saturday, mid 50s Sunday.
  • Low Temps: Low 30s Friday night, mid 30s Saturday night, mid 30s Sunday night.
  • Sky Cover: Mostly sunny Friday, mostly clear Friday night, partly sunny Saturday, partly cloudy Saturday night, partly sunny Sunday, mostly cloudy Sunday night.
Next Week
  • Wind: Breezy through much of the week with SW winds. Some gusts near 35 likely, mainly through the Palouse.
  • Precipitation: Chance for scattered rain and upland snow Tuesday. Becoming mostly dry Wednesday and Thursday with a low threat for a stray shower or two. Return of rain and upland snow showers likely Thursday night/Friday, especially near the Idaho border.
  • High Temps: Low 50s Monday, upper 40s Tuesday, upper 40s Wednesday, mid 40s Thursday.
  • Low Temps: Mid 30s Monday night, low 30s Tuesday night, low 30s Wednesday night, mid 30s Thursday night.
  • Sky Cover: Partly cloudy early in the week. Becoming cloudier by Thursday/Friday.

Western Washington
Weekend
  • Wind: Light and variable, slightly breezier near the coast/sound. SW winds increasing Sunday with some gusts approaching 30mph, again, primarily near coastal/sound regions.
  • Precipitation: Dry through the bulk of the weekend with rain and mountain snow moving in from the NW Sunday night. Snow lowering to pass levels through the overnight.
  • High Temps: Low 60s Friday, upper 50s Saturday, Upper 50s Sunday. Much cooler through the Cascades and Olympics.
  • Low Temps: Mid 30s Friday night, mid 30s Saturday night, near 40 Sunday night.
  • Sky Cover: Mostly sunny Friday, mostly clear Friday night, mostly sunny Saturday, partly cloudy Saturday night, mostly cloudy Sunday, overcast Sunday night. Patchy Fog through the weekend.
Next Week
  • Wind: Breezy W/SW winds early in the week with a few gusts near 30mph. Winds calming mid week and becoming more variable. W/SW winds to pick back up by weeks end.
  • Precipitation: Rain and mountain snow Monday and Tuesday. Conditions to trend dry through Tuesday night with a lingering shower or two, especially over the Cascades. Rain and mountain snow to move back in from the NW Thursday. Generally light accumulations expected at pass levels.
  • High Temps: Upper 40s Monday, low 50s Tuesday, low 50s Wednesday, upper 40s Thursday.
  • Low Temps: Mid 30s Monday night, low 30s Tuesday night, mid 30s Wednesday night, upper 30s Thursday night.
  • Sky Cover: Mostly cloudy to overcast early in the week, a brief mostly sunny period mid week, and turning mostly cloudy to overcast again Thursday.

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