AgWeatherNet Weekly Outlook for March 26 to April 01, 2021

Active weather Sunday, followed by a mostly dry and warm week

Mark Ingalls, AgWeatherNet Intern
Craig Oswald, AgWeatherNet Field Meteorologist

Synopsis:

Ridging offshore of the Western United States will offer a dry start to the weekend. Despite this, mostly cloudy skies are expected to remain in place west of the Cascades. Saturday night, a strong cold front starts making its way onshore, moving across the state during the day Sunday. This will bring rain, mountain snow, and windy conditions Sunday, with some lingering showers and low snow levels Monday. This cold front is expected to lower temperatures in Eastern Washington by about 10 degrees, but they begin to rebound Tuesday as a new ridge builds offshore, providing west/northwest flow within the upper levels over the Pacific Northwest. Dry conditions and warming temperatures resulting from this ridge as it traverses east should last through Thursday.

Discussion:

An upper level ridge continues to build over the state Friday as the most recent disturbance moves out of the Pacific Northwest. This will produce dry conditions through Saturday, along with mostly sunny skies east of the Cascades. High clouds passing over the western half of the state will likely moderate temperatures somewhat there. Highs are expected to near 70 by Sunday afternoon in the warmest parts of Eastern Washington.

Meanwhile, the next disturbance will begin making its way onshore Saturday afternoon. This cold front is expected to cross Washington from northwest to southeast, with most of the precipitation falling Sunday and Sunday night. Snow levels at the onset of precipitation look to be around 5000 feet or more, but by the time the front clears the state they are expected to be around 1000 to 1500 feet. A few lingering showers Monday morning may have snow at or above this elevation, especially close to the mountains.

Precipitation values east of the Cascades should be light if any. Windy conditions are expected throughout Washington with this front on Sunday and Monday. In Western Washington, peak winds should occur midday Sunday with widespread gusts nearing 40 mph and some areas of gusts exceeding 50 mph. Winds in Eastern Washington begin picking up during the afternoon hours but peak with the frontal passage during the evening hours. Look for gusts nearing 55 miles per hour along and east of a line from the Tri-Cities to Davenport. Winds should slowly ease in the 24 hours following the cold front's passage.

Tuesday and Wednesday a new ridge begins moving over the Western United States. This will allow for a return to dry conditions and warming temperatures. By Wednesday morning, 850 mb temperatures are expected to warm enough to mitigate frost risk in most lowlands statewide, lasting into Thursday. Beyond the end of the forecast period, it looks as though another strong cold front may begin impacting the region Friday providing cooler conditions into the weekend.


8 to 14 Day Outlook, April 02 to April 08, 2021
  • Below average temperatures and near average precipitation are favored for the period.

Important Points About Next Week's Weather

South Central Washington
Weekend
  • Wind: SW and light through Sat, becoming W and windy Sun PM & night.
  • Precipitation: Light rain showers possible Sun night.
  • High Temps: Mid 60s Sat, near 70 Sun.
  • Low Temps: Mid 30s Fri night, near 40 Sat & Sun nights.
  • Sky Cover: Mostly clear Sat, increasing clouds Sun. Areas of blowing dust Sun night.
Next Week
  • Wind: NW and breezy Mon. Light and variable Tue-Wed. Becoming SW and breezy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 60 Mon & Tue, mid 60s Wed, low 70s Thu.
  • Low Temps: Low 30s Mon night, mid 30s Tue night, upper 30s Wed & Thu nights.
  • Sky Cover: Mostly clear. Patchy blowing dust Mon.

North Central Washington
Weekend
  • Wind: NW and light through Sat, becoming W and windy Sun PM into Sun night.
  • Precipitation: Low chance of rain Sun, low chance of rain/snow Sun night.
  • High Temps: Low 60s Sat, near 60 Sun. Cooler in higher terrain.
  • Low Temps: Mid 30s Fri night, upper 30s Sat night, low 30s Sun night. Cooler in higher terrain.
  • Sky Cover: Mostly clear Sat, mostly cloudy Sun. Areas of blowing dust in the Basin Sun night.
Next Week
  • Wind: NW and breezy Mon. Light and variable Tue-Wed. Becoming S and breezy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Mid 50s Mon & Tue, near 60 Wed, mid 60s Thu. Cooler in higher terrain.
  • Low Temps: Near 30 Mon night, mid 30s Tue-Thu nights. Cooler in higher terrain.
  • Sky Cover: Mostly clear. Areas of blowing dust in the Basin Mon.

Eastern Washington
Weekend
  • Wind: SW and light through Sat, becoming W and windy Sun PM & night.
  • Precipitation: Low chance of rain Sun, low chance of rain/snow Sun night.
  • High Temps: Mid 50s Sat, near 60 Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Low 30s Fri night, upper 30s Sat night, low 30s Sun night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly clear Sat, mostly cloudy to overcast Sun. Patchy blowing dust Sun night.
Next Week
  • Wind: NW and breezy Mon. Light and variable Tue-Wed. Becoming S and breezy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 50 Mon, low 50s Tue, upper 50s Wed, mid 60s Thu. Warmer in the Lewis & Clark Valley.
  • Low Temps: Mid 20s Mon night, near 30 Tue night, low 30s Wed night, mid 30s Thu night, Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly cloudy with areas of blowing dust Mon, mostly clear Tue-Thu.

Western Washington
Weekend
  • Wind: Generally S with breezy areas Sat, generally S and windy Sun.
  • Precipitation: Rain and mountain snow Sun.
  • High Temps: Mid 50s 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: Generally light and variable Mon-Wed with breezy areas along the coast. Becoming S with breezy areas Thu.
  • Precipitation: Low chance precip Mon AM. Snow level around 1000 feet.
  • High Temps: Near 50 Mon, low 50s Tue, mid 50s Wed, near 60 Thu. Cooler in higher terrain.
  • Low Temps: Upper 30s Mon-Thu nights. Cooler in higher terrain.
  • Sky Cover: Decreasing clouds Mon, mostly clear Tue-Wed, increasing clouds Thu.

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Washington State University