AgWeatherNet Weekly Weather Outlook for October 25 to October 31, 2021

Moisture waning with dry weather expected for the weekend

Mark Ingalls, AgWeatherNet Field Technician

Synopsis:

Off and on shower activity is expected in and west of the Cascades through the work week with a few blasts of rain in Eastern Washington. Windy conditions for the Coast and Northwest Interior should last through Monday. Tuesday, a cold front crosses the state to bring widespread rain to Western Washington and mountainous areas and a chance of rain to Eastern Washington lowlands. Leftover showers are possible statewide Wednesday before another weak disturbance moves through Thursday and Friday before a dry and cool weekend.

Discussion:

The strong cyclone that brought heavy rain and wind to parts of the Pacific Northwest is nearing Vancouver Island as of Monday morning. Data suggests that the minimum air pressure in this low reached 942 mb during the day Sunday. If confirmed, that would make it the lowest air pressure recorded in that portion of the Pacific Ocean. That air pressure is roughly equivalent to what may be expected from a category 4 hurricane.

Because extratropical cyclones like the one that is striking the region are geographically larger than hurricanes, the winds are not quite as extreme. Still, downsloping winds off the Blues and Cascades produced wind gusts above 50 mph in the state, with gusts above 60 on the Washington Coast. Nearby, a gust of 74 mph was observed near Astoria with 73 mph seen outside Pendleton.

The low is expected to transition to a more wave-like pattern and cross the state today, bringing continued breezy winds and rain showers. Early Tuesday, the next cold front moves onshore to bring another round of rain and high elevation snow. Snow levels are likely to remain above 4500 feet, making it so that only the highest passes see a little bit of snow. Rainfall spreads eastward, exiting the state Wednesday.

An upper level ridge is forecast to begin building on Wednesday, signaling the end of the region's unsettled period, but will be transited by a shortwave trough on Thursday bringing a weaker round of rain and mountain snow. A weakening cold front on Friday pushes this moisture plume out allowing the ridge to take a stronger hold over the Pacific Northwest. Look for drying conditions (with just a few showers in and west of the Cascades) and cool temperatures into the weekend.


8 to 14 Day Outlook, November 1 to November 7, 2021
  • Above average temperatures and below average precipitation are favored for the period.

Important Points About This Week's Weather

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

North Central Washington
Remainder of the Week
  • Wind: S with breezy areas Tue, SW with breezy areas Wed, S with breezy areas Thu, N with breezy areas Fri.
  • Precipitation: Rain Tue, chance of rain Wed, rain Thu, chance of rain Fri.
  • High Temps: Mid 50s Tue, upper 50s Wed, Mid 50s Thu-Fri. Cooler in higher terrain.
  • Low Temps: Near 40 Mon-Tue nights, low 40s Wed night, mid 40s Thu night, upper 30s Fri night. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy.
Weekend
  • Wind: N and light Sat, NE and light Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 50s Sat & Sun. Cooler in higher terrain.
  • Low Temps: Mid 30s Sat night, low 30s Sun night. Cooler in higher terrain and sheltered areas.
  • Sky Cover: Partly cloudy.

Eastern Washington
Remainder of the Week
  • Wind: S with breezy areas Tue, SW with breezy areas Wed, S with breezy areas Thu, W with breezy areas Fri.
  • Precipitation: Rain Tue, chance of rain Thu & Fri.
  • High Temps: Low 50s Tue, mid 50s Wed-Fri. Warmer in the Lewis & Clark Valley.
  • Low Temps: Near 40 Mon-Wed nights, mid 40s Thu night, low 30s Fri night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly cloudy.
Weekend
  • Wind: N and light Sat, NE and light Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 50s Sat, near 50 Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Near 30 Sat night, upper 20s Sun night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Partly cloudy.

Western Washington
Remainder of the Week
  • Wind: SW and breezy Tue, S with breezy areas Wed-Thu, N with breezy areas Fri.
  • Precipitation: Rain and high elevation snow through Fri.
  • High Temps: Mid 50s Tue-Thu, low 50s Fri. Cooler in higher terrain.
  • Low Temps: Near 50 Mon-Thu night, low 40s Fri night. Cooler in higher terrain.
  • Sky Cover: Mostly cloudy to overcast.
Weekend
  • Wind: NE with breezy areas Sat-Sun.
  • Precipitation: Isolated showers rain and mountain snow showers.
  • High Temps: Low 50s Sat & Sun. Cooler in higher terrain.
  • Low Temps: Near 40 Sat & Sun nights. Cooler in higher terrain.
  • Sky Cover: Partly cloudy.

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Washington State University