AgWeatherNet Weekly Weather Outlook for October 11 to October 17, 2021

Active weather to continue, but drought relief in the hardest hit areas to be limited

Mark Ingalls, AgWeatherNet Field Technician

Synopsis:

A few showers in Western Washington and the Cascades may linger into Tuesday morning. Otherwise, expect dry conditions before the next cold front approaches the state during the afternoon hours. Rain and mountain snow is forecast to cross the Cascades Tuesday night with light rain showers possible in Eastern Washington lowlands Wednesday. A low chance of rain and mountain snow showers is present for Western Washington through Thursday with an increased chance Friday through the weekend. Some showers may make it east of the Cascades during this period, mainly in the mountains and near the Idaho state line.

Discussion:

Onshore flow is expected to ease during the day Monday, bringing a decrease in shower activity west of the Cascades. By Tuesday morning, only isolated showers are expected to remain in and near mountainous areas. An incoming cold front is forecast to bring a resumption of rainfall along the coast as early as about noon Tuesday, spreading eastward and crossing the Cascades Tuesday night. Snow levels are forecast to be just above Snoqualmie Pass, though a rain/snow mix is possible along I-90 at times.

Light rain showers are possible Wednesday morning in the Columbia Basin and along the US 97 corridor, though precipitation totals are likely to be light. Rain reaches the Palouse and Spokane area during the afternoon with modest amounts there. This is not expected to make a major dent in the drought conditions gripping the region. West of the Cascades, rain showers are forecast to gradually taper off Wednesday night for most locations with a mainly dry say statewide Thursday. A disturbance aiming at the northern British Columbia coast may bring some rain to areas north of a line from Aberdeen to Omak on Thursday night.

Model guidance suggests a possible modest moisture plume will aim at the Pacific Northwest Friday through the weekend. If this verifies, the plume will start off oriented from southwest to northeast, leaving the Yakima Valley, Columbia Basin, and Palouse out of most of the precipitation. This orientation will also bring rising snow levels. Late Saturday or Sunday, a cold front sweeps the bulk of the moisture onshore with more widespread precipitation chances.


8 to 14 Day Outlook, October 18 to October 24, 2021
  • Above average temperatures and above average precipitation are favored for the period.

Important Points About This Week's Weather

South Central Washington
Remainder of the Week
  • Wind: W/SW with breezy areas Tue-Fri.
  • Precipitation: Chance of rain Wed.
  • High Temps: Upper 50s Tue, mid 50s Wed, low 60s Thu, mid 60s Fri.
  • Low Temps: Near 30 Mon night, low 40s Tue night, upper 30s Wed night, low 40s Thu-Fri nights. Cooler in sheltered areas.
  • Sky Cover: Partly cloudy Tue, mostly cloudy Wed, partly cloudy Thu-Fri.
Weekend
  • Wind: Generally light Sat, W and breezy Sun.
  • Precipitation: Partly cloudy Sat, mostly cloudy Sun.
  • High Temps: Mid 60s Sat & Sun.
  • Low Temps: Mid 40s Sat & Sun nights.
  • Sky Cover: Partly cloudy Sat, mostly cloudy Sun.

North Central Washington
Remainder of the Week
  • Wind: Generally light and variable.
  • Precipitation: Chance of rain and mountain snow Tue night, Wed, and Fri.
  • High Temps: Upper 50s Tue, mid 50s Wed, near 60 Thu, low 60s Fri. Cooler in higher terrain.
  • Low Temps: Low 30s Mon night, near 40 Tue night, mid 30s Wed night, low 40s Thu night, mid 40s Fri night. Cooler in higher terrain and sheltered areas.
  • Sky Cover: Increasing clouds Tue, decreasing clouds Wed, partly cloudy Thu, mostly cloudy Fri.
Weekend
  • Wind: Generally light Sat, W and breezy Sun.
  • Precipitation: Chance of rain and mountain snow.
  • High Temps: Low 60s Sat & Sun. Cooler in higher terrain.
  • Low Temps: Mid 40s Sat & Sun nights. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy.

Eastern Washington
Remainder of the Week
  • Wind: W/SW with breezy areas Tue-Fri.
  • Precipitation: Chance of rain and mountain snow Wed.
  • High Temps: Mid 50s Tue, upper 40s Wed, low 50s Thu, upper 50s Fri. Warmer in the Lewis & Clark Valley.
  • Low Temps: Mid 20s Mon night, low 30s Tue-Wed nights, mid 30s Thu night, mid 30s Fri night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Partly cloudy Tue, mostly cloudy Wed-Fri.
Weekend
  • Wind: Generally light Sat, W and breezy Sun.
  • Precipitation: Chance of rain and mountain snow Sun.
  • High Temps: Low 60s Sat, upper 50s Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Near 40 Sat & Sun nights. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly cloudy.

Western Washington
Remainder of the Week
  • Wind: Generally light and variable except breezy on the coast Tue-Thu. S with breezy areas Fri.
  • Precipitation: Rain and mountain snow showers Tue-Fri.
  • High Temps: Low 50s Tue-Wed, mid 50s Thu, upper 50s Fri. Cooler in higher terrain.
  • Low Temps: Upper 30s Mon night, mid 40s Tue-Wed night, upper 40s Thu-Fri nights.
  • Sky Cover: Mostly cloudy to overcast.
Weekend
  • Wind: Light and variable Sat, W with breezy areas Sun.
  • Precipitation: Rain and mountain snow showers.
  • High Temps: Upper 50s Sat, mid 50s Sun. Cooler in higher terrain.
  • Low Temps: Upper 40s Sat & Sun nights. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy to overcast.

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Washington State University