AgWeatherNet Weekly Weather Outlook for Apr 10 to Apr 16, 2020

A brief cold spell this weekend followed by near to above normal temperatures next week

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

Discussion:

Despite the sunny and warm weather many have enjoyed this week, temperatures are expected to dip below normal over the weekend as colder air begins to make its way into Washington from the north/northeast late Friday night. A few upland and mountain rain/snow showers, along with some scattered light rain showers in western Washington, are possible late Friday night through Saturday before trending dry statewide Saturday night. Temperatures look to climb back to near average early in the week before continuing to warm through mid-week. High temperatures are expected to be back into the 70s for much of eastern Washington by mid-week. A few scattered rain showers may pop up again mid-week, but other than that, conditions look to remain dry through the week with mostly sunny and clear skies.

As the cold front begins to move into Washington from the north/northeast late Friday night, winds are expected to increase and shift northerly. Conditions are expected to remain blustery through the day Saturday in eastern Washington as the cold front continues to move south. Gusts around 40 mph can be anticipated, especially through the Basin and Palouse. Areas of blowing dust near freshly tilled and planted fields can also be expected. This blowing dust will only add to the misery a number of people are currently feeling from the high pollen concentration due to blossoming trees. Fire danger will also be elevated due to the combination of strong winds and low humidity. However, blustery conditions look to trend lighter through the night Saturday with calm to light wind conditions expected for Sunday and the remainder of the weekend. As the cold front makes its way through the state, it has the potential to initiate a few light scattered rain/snow showers from Friday night into Saturday. But due to the lack of available moisture in the air, any shower activity is expected to be relegated to upland and mountain regions.

Temperatures this weekend look to be colder than what was anticipated in Mondays outlook. Sunday will likely be the coldest night as cold and dry air settles into eastern Washington through Saturday. Dew points look to reach as low as the single digits. Temperatures have the potential to reach overnight lows of near 20 in some fruit growing parts of northern Washington, and low 20s in some fruit growing parts of southern Washington. The coldest temperatures are expected to be found in areas that typically run cooler during inversion nights due to cold air pooling. Far eastern Washington, near the Idaho border, also looks to be colder than areas further west. Lowland areas west of the Cascades can expect patchy frost in cold-prone regions both Saturday and Sunday night, although temperatures will mostly remain above freezing. 

As we move into the beginning of next week, a robust ridge looks to build into the north Pacific and Alaska. This looks to place most of the Pacific Northwest under northwesterly flow downstream of the ridge axis. This is a significant departure from the active, stormy weather pattern than has been in place for most of the winter and early spring. Residence near the ridge is expected to bring warmer temperatures through the first part of the week with 70s anticipated in many locations by mid-week. The dry and warm conditions will extend to western Washington as well, with highs generally in the 60s. A shortwave embedded in the mean flow aloft also looks to pass over Washington Wednesday night. This will bring an opportunity again for a scattered rain shower or two throughout the state. However, with the air mass expected to remain rather dry, any shower activity will likely be very few and far between. Other than this slim chance for showers, conditions for the upcoming week look to remain dry, sunny/mostly clear, and generally light on wind. With these conditions expected through the week, overnight low temperatures will continue to be on the cool side with overnight lows still having the potential to dip into the mid to upper 30s in the colder locations, even though daytime highs will be into the upper 60s and 70s for much of the week.


8 to 14 Day Outlook - Apr 17, 2020 to Apr 23, 2020
  • Slightly warmer than average temperatures and slightly below average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week's Weather

South Central Washington
Weekend
  • Wind: Mostly west winds to increase through Friday and Friday night. Shifting north Saturday with blustery conditions and gusts around 40-45 mph, particularly through the Basin. Blustery conditions to trend lighter through Saturday night while shifting more E/NE. Calm to light and variable Sunday and Sunday night.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 70s Friday, mid 60s Saturday, low 60s Sunday.
  • Low Temps: Low 40s Friday night, near 30 Saturday night, near 30 Sunday night.
  • Sky Cover: Sunny Friday, mostly clear Friday night, mostly sunny Saturday, partly cloudy Saturday night, sunny Sunday, mostly clear Sunday night.
Next Week
  • Wind: Calm to light winds switching to generally W Monday night but remaining light and variable. Slightly breezier through the Basin.
  • Precipitation: Dry conditions expected aside from a low chance of a passing rain shower or two Wednesday night.
  • High Temps: Mid 60s Monday, low 70s Tuesday, mid 70s Wednesday, mid 70s Thursday.
  • Low Temps: Mid 30s Monday night, near 40 Tuesday night, low 40s Wednesday night, low 40s Thursday night.
  • Sky Cover: Sunny to partly cloudy.

North Central Washington
Weekend
  • Wind: Mostly northwest winds to increase through Friday and Friday night. Shifting north Saturday with blustery conditions and gusts around 40-45 mph, particularly through the Basin. Blustery conditions to trend lighter through Saturday night. Calm to mostly light and northerly, yet variable at times, Sunday and Sunday night.
  • Precipitation: Dry conditions expected for most of the region. Some light and scattered upland and mountain rain/snow possible late Friday night and into Saturday. Little to no accumulation expected under any such activity.
  • High Temps: Low 70s Friday, upper 50s Saturday, upper 50s Sunday. Cooler through higher terrain.
  • Low Temps: Near 40 Friday night, upper 20s Saturday night, mid 20s Sunday night. Cooler through higher terrain.
  • Sky Cover: Sunny Friday, mostly clear Friday night, mostly sunny Saturday, mostly clear Saturday night, sunny Sunday, mostly clear Sunday night.
Next Week
  • Wind: Calm to light winds switching more W/NW Monday night but remaining light and variable. Slightly breezier through the Basin.
  • Precipitation: Dry conditions expected aside from a low chance of a passing rain shower or two Wednesday night.
  • High Temps: Low 60s Monday, upper 60s Tuesday, upper 60s Wednesday, low 70s Thursday. Cooler through higher terrain.
  • Low Temps: Low 30s Monday night, near 40 Tuesday night, low 40s Wednesday night, low 40s Thursday night. Cooler through higher terrain.
  • Sky Cover: Sunny to partly cloudy.

Eastern Washington
Weekend
  • Wind: Mostly west winds to increase through Friday and Friday night. Shifting north Saturday with blustery conditions and gusts around 40-45 mph, particularly through the Basin/Palouse. Blustery conditions to trend lighter through Saturday night while shifting more E/NE. Mostly light and variable Sunday and Sunday night.
  • Precipitation: Dry conditions expected for most of the region. Some light and scattered upland and mountain rain/snow possible late Friday night and into Saturday. Little to no accumulation expected under any such activity. Greater chance for a scattered shower or two along the Idaho border.
  • High Temps: Mid 60s Friday, near 50 Saturday, near 50 Sunday.
  • Low Temps: Upper 30s Friday night, low 20s Saturday night, mid 20s Sunday night.
  • Sky Cover: Sunny Friday, mostly clear Friday night, partly sunny Saturday, mostly clear Saturday night, sunny Sunday, mostly clear Sunday night.
Next Week
  • Wind: Calm to light winds switching to generally W Monday night but remaining light and variable. Slightly breezier through the Basin and Palouse.
  • Precipitation: Dry conditions expected aside from a chance of a passing rain shower or two Wednesday night.
  • High Temps: Low 50s Monday, upper 50s Tuesday, near 60 Wednesday, mid 60s Thursday.
  • Low Temps: Mid 20s Monday night, mid 30s Tuesday night, near 40 Wednesday night, low 40s Thursday night.
  • Sky Cover: Sunny to partly cloudy.

Western Washington
Weekend
  • Wind: Mostly west winds to slightly increase through Friday and Friday night. Shifting north Saturday and remaining a bit breezy with some gusts around 25 mph. Breezy conditions to trend lighter through Saturday night. Calm to light and variable Sunday and Sunday night.
  • Precipitation: Some light and scattered rain showers to start moving in from the north Friday night along with light mountain snow showers. Conditions to trend dry north to south Saturday as showers continue to move south. Little snow accumulation expected under any such activity.
  • High Temps: Low 60s Friday, upper 50s Saturday, low 60s Sunday. Much cooler through the Cascades and Olympics.
  • Low Temps: Near 40 Friday night, mid 30s Saturday night, mid 30s Sunday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Partly sunny Friday, mostly cloudy Friday night, partly sunny Saturday, mostly clear Saturday night, sunny Sunday, mostly clear Sunday night.
Next Week
  • Wind: Calm to light winds switching to generally W Monday night but remaining light and variable.
  • Precipitation: Dry conditions expected aside from a chance of a few passing rain showers Wednesday night.
  • High Temps: Mid 60s Monday, mid 60s Tuesday, upper 60s Wednesday, upper 60s Thursday. Much cooler through the Cascades and Olympics.
  • Low Temps: Mid 30s Monday night, near 40 Tuesday night, low 40s Wednesday night, low 40s Thursday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Sunny to partly cloudy.

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