AgWeatherNet Weekly Outlook for April 16 to April 22, 2021

Dry conditions continue into next week

Mark Ingalls, AgWeatherNet Intern
Craig Oswald, AgWeatherNet Field Meteorologist

Synopsis:

Ridging along the west coast of the United States and Canada is expected to keep the Pacific Northwest under mostly sunny skies during the coming week. Well above average temperatures are forecast for the weekend with temperatures moderating somewhat for the beginning of the work week. The cool down is the result of a cold front moving in from the northeast and skirting along the Washington/Idaho border. For the western half of the state, a shift in the ridge axis is expected to change the flow pattern from offshore to onshore. Temperatures are expected to remain cooler through the week, but still above average in most locations.

Discussion:

As the closed low that helped dominate the regional weather pattern moves eastward, the ridge of high pressure to the north will continue to build south across the Pacific Northwest. Breezy conditions in eastern and southwestern parts of the state are expected to ease overnight. Winds aloft should be significantly lighter Saturday so while there will be plenty of vertical mixing in the atmosphere there won’t be gusty conditions mixing to the surface.

Look for warm, dry, and calm conditions until Sunday evening before the afore mentioned cold front begins moving south from the Canadian Rockies into Eastern Washington to resume strong northeasterly winds. Some higher mountain peaks may receive some precipitation from this, but with the continental nature of its’ origin there is not much moisture embedded in the airmass. Western Washington is not likely to see any impacts from this cold front except some strong easterly winds through the Cascade mountain gaps.

Breezy conditions should last for the Columbia Basin into Monday before trending lighter with high temperatures in much of Eastern Washington around 10-15 degrees cooler than Sunday. Overnight lows should also drop, but only into the mid 30s to low 40s in the lowlands. Meanwhile, the ridge axis shifts a little east and breaks down a bit, shifting surface winds from easterly to westerly in Western Washington. This change will lower daytime temperatures by about ten degrees between Sunday and Tuesday. Increased moisture is forecast to help keep morning lows in Western Washington lowlands in the mid to upper 40s.

Temperatures remain fairly consistent in the western half of the state Tuesday and Wednesday under mostly clear skies statewide. Some increased clouds are possible on the Olympic Peninsula Thursday afternoon with an incoming disturbance, but for the Puget Sound Region and southwest Washington look for much of the same. East of the Cascades, clear skies continue with a warming trend through the week. By Thursday, the warmest areas may get close to 80 once again.


8 to 14 Day Outlook, April 23 to April 29, 2021
  • Above average temperatures and precipitation are favored for the period.

Important Points About Next Week's Weather

South Central Washington
Weekend
  • Wind: Generally NE, becoming windy Sun evening.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 80 Sat, mid 80s Sun.
  • Low Temps: Low 40s Fri night, mid 40s Sat & Sun night. Cooler in sheltered areas.
  • Sky Cover: Sunny/clear.
Next Week
  • Wind: NE and breezy Mon, light and variable Tue-Wed, W and possibly breezy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 70 Mon, low 70s Tue, mid 70s Wed, upper 70s Thu.
  • Low Temps: Near 40 Mon night, mid 40s Tue-Thu nights. Cooler in sheltered areas.
  • Sky Cover: Sunny/clear.

North Central Washington
Weekend
  • Wind: Generally N to NE, windy areas Sun evening.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 80 Sat, low 80s Sun. Cooler in higher terrain.
  • Low Temps: Mid 40s Fri-Sun nights. Cooler in higher terrain and sheltered areas.
  • Sky Cover: Sunny/clear.
Next Week
  • Wind: NE and breezy in the Basin Mon, light and variable Tue-Wed, W and possibly breezy in the Basin Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 60s Mon, low 70s Tue, mid 70s Wed-Thu. Cooler in higher terrain.
  • Low Temps: Near 40 Mon-Tue nights, low 40s Wed-Thu nights. Cooler in higher terrain and sheltered areas.
  • Sky Cover: Sunny/clear to partly cloudy.

Eastern Washington
Weekend
  • Wind: Generally NE, becoming windy Sun evening.
  • Precipitation: Dry conditions expected.
  • High Temps: Mid 70s Sat & Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Near 40 Fri night, low 40s Sat night, upper 30s Sun night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Sunny/clear to partly cloudy.
Next Week
  • Wind: NE and breezy Mon, light and variable Tue-Wed, W and possibly breezy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 60s Mon, mid 60s Tue, near 70 Wed & Thu. Warmer in the Lewis and Clark Valley.
  • Low Temps: Mid 30s Mon night, upper 30s Tue night, low 40s Wed & Thu nights. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Sunny/clear to partly cloudy.

Western Washington
Weekend
  • Wind: Generally E with breezy conditions near mountain gaps Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 70s Sat, mid 70s Sun. Cooler in higher terrain and on the coast.
  • Low Temps: Near 50 Fri-Sun nights. Cooler in higher terrain.
  • Sky Cover: Sunny/clear to partly cloudy.
Next Week
  • Wind: Light and variable for most Mon-Wed, becoming W and breezy Thu.
  • Precipitation: Low chance of rain Thu PM on the Olympic Peninsula, otherwise dry.
  • High Temps: Near 70 Mon, mid 60s Tue-Thu. Cooler in higher terrain.
  • Low Temps: Upper 40s Mon-Thu nights. Cooler in higher terrain.
  • Sky Cover: Sunny/clear Mon, partly cloudy Tue-Wed, mostly cloudy Thu.
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