AgWeatherNet Weekly Outlook for April 02 to April 08, 2021

Light precipitation chances for parts of the state over the next week

Mark Ingalls, AgWeatherNet Intern
Craig Oswald, AgWeatherNet Field Meteorologist
Joe Boomgard-Zagrdonik, WSU Postdoctoral Research Associate

Synopsis:

There is a chance of rain and mountain snow through the weekend thanks to a generally unsettled weather pattern with onshore flow at upper-levels. Precipitation is expected to be light and limited to areas in and west of the Cascades. Heading into next week, the unsettled weather is expected to move eastward into the Rockies allowing for drier conditions Monday. Zonal flow across the region Tuesday through Thursday along with an upper feature indicated to skirt to the north is expected to bring another chance of light precipitation to western Washington and the Cascades beginning around the Wednesday night time frame.

Discussion:

A few weak shortwave disturbances are expected to cycle through the Pacific Northwest over the weekend as they work their way around a larger upper level trough located offshore. This is expected to bring a chance of rain to Western Washington and the Palouse as well as light snow showers in mountain areas. Precipitation values are expected to be light if any. Elsewhere, mostly cloudy skies and mild temperatures are likely.

Sunday's forecasted cold front in conjunction with an emerging upper closed low will likely be the most impactful weather of the weekend as winds are expected to increase modestly following its passage. Much of Eastern Washington and the Southwestern Interior can look for breezy conditions during the afternoon. Winds are expected to be strongest in the Kittitas Valley and the eastern half of the Columbia Gorge, where isolated gusts to 45 mph are possible.

For the start of the work week, the upper level closed low looks to further intensify as it progresses eastward. Behind it, clearing skies and drier conditions are in the forecast for Monday. There is quite a bit of model uncertainty regarding the larger weather pattern that will dominate the region Tuesday through Thursday, but it seems that onshore, zonal flow across Washington itself is likely, with the possibility of an upper feature skirting the state to the north around Wednesday. This solution would keep mild temperatures in place as well as a pretty consistent low chance of rain and mountain snow in and west of the Cascades aside from Wednesday night where conditions may turn more active.

For specific temperature forecasts relevant to tree fruit growers in Central Washington, please see AgWeatherNet's Spring Frost Program. These forecasts and tools can be found in the sidebar at weather.wsu.edu.


8 to 14 Day Outlook, April 10 to April 16, 2021
  • Below average temperatures and below average precipitation are favored for the period.

Important Points About Next Week's Weather

South Central Washington
Weekend
  • Wind: SW and light Sat, becoming W and breezy Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 60s Sat, mid 60s Sun.
  • Low Temps: Low 40s Fri night, mid 40s Sat night, near 40 Sun night.
  • Sky Cover: Increasing clouds Fri night, mostly cloudy Sat & Sun.
Next Week
  • Wind: W and light Mon, becoming S and light Tue, S with breezy areas possible Wed-Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 60s Mon, mid 60s Tue-Thu.
  • Low Temps: Mid 30s Mon night, near 40 Tue-Thu nights.
  • Sky Cover: Partly cloudy.

North Central Washington
Weekend
  • Wind: SW and light Sat, becoming W and breezy in the Basin Sun.
  • Precipitation: Upslope light rain and snow showers possible, dry in the lowlands.
  • High Temps: Mid 60s Sat, upper 50s Sun. Cooler in higher terrain.
  • Low Temps: Upper 30s Fri night, low 40s Sat night, upper 30s Sun night. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy.
Next Week
  • Wind: W and light Mon, becoming S and light Tue, S with breezy areas possible Wed-Thu.
  • Precipitation: Upslope light rain and snow showers possible Tue-Thu, dry in the lowlands.
  • High Temps: Mid 60s Mon-Tue, low 60s Wed, near 60 Thu. Cooler in higher terrain.
  • Low Temps: Upper 30s Mon-Thu nights. Cooler in higher terrain.
  • Sky Cover: Partly cloudy Mon-Wed, mostly cloudy Thu.

Eastern Washington
Weekend
  • Wind: SW and light Sat, becoming W and breezy Sun.
  • Precipitation: Low chance of convective showers Sat & Sun but most will stay dry.
  • High Temps: Low 60s Sat, upper 50s Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Upper 30s Fri night, low 40s Sat night, mid 30s Sun night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly cloudy.
Next Week
  • Wind: W and light Mon, becoming S and light Tue, S with breezy areas possible Wed-Thu.
  • Precipitation: Low chance of convective showers on the Palouse Tue-Thu but most will stay dry.
  • High Temps: Upper 50s Mon-Thu. Warmer in the Lewis & Clark Valley.
  • Low Temps: Mid 30s Mon-Thu nights. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly cloudy Mon, partly cloudy Tue-Wed, mostly cloudy Thu.

Western Washington
Weekend
  • Wind: Light and variable Sat, becoming W with breezy areas Sun.
  • Precipitation: Chance of rain and mountain snow Sat-Sun.
  • High Temps: Near 60 Sat, near 50 Sun. Cooler in higher terrain.
  • Low Temps: Low 40s Fri-Sat nights, upper 30s Sun night. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy to overcast.
Next Week
  • Wind: Light and variable Mon-Tue, becoming S with breezy areas Wed-Thu.
  • Precipitation: Chance of light rain and mountain snow Tue-Thu.
  • High Temps: Mid 50s Mon-Thu. Cooler in higher terrain.
  • Low Temps: Low 40s Mon-Thu nights. Cooler in higher terrain.
  • Sky Cover: Partly cloudy Mon, mostly cloudy to overcast Tue-Thu.

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