AgWeatherNet Weekly Weather Outlook for June 14 to June 20, 2021

Rain showers to start but quickly becoming dry and warmer

Mark Ingalls, AgWeatherNet Intern

Note: Starting this week, outlooks will only be issued on Mondays. This allows our team to focus more on network maintenance. Friday outlooks will resume this fall.

Synopsis:

Unsettled weather will last through Tuesday before the upper level trough driving it moves out of the region. Rain showers are likely Monday night, lasting into Tuesday for some parts of the state. With the trough passing overhead Tuesday, that is likely to be the coolest day for a while. By Wednesday, all should be dry with clearing skies as a ridge of high pressure builds overhead. This will initiate a warming trend with lowland temperatures rising well into the 70s west of the Cascades and into the 90s for parts of Eastern Washington as early as Friday. A shortwave disturbance may move through Friday to bring gusty winds, but it is not expected to have a significant amount of moisture along with it.

Discussion:

Look for another day of rain showers throughout the Pacific Northwest thanks to the upper level trough that has been sitting along the coast for the last few days. Cooler temperatures aloft with the trough directly overhead allow for isolated strong thunderstorms during the overnight hours generally east of a line extending from the Tri-Cities to Moses Lake to Republic. Tuesday, showers taper off in the eastern half of the state while a few thunderstorms are possible in Western Washington thanks to daytime heating and the cool mid-level temperatures. Tuesday is likely to be the coolest day for a while with highs in the 60s for Western Washington and the 70s in Eastern Washington lowlands.

By Wednesday morning look for clearing skies statewide with a ridge of high pressure replacing the upper level trough. This is expected to initiate a long warm and dry period heading toward the Summer Solstice. The ridge will build until Friday when a shortwave disturbance is expected to bring breezy conditions to typical windy parts of the state. This combined with low relative humidities may cause fire weather concerns in Eastern Washington.

Into the weekend, the Pacific Northwest comes under the influence of a strengthening ridge just offshore. Since the ridge axis is not expected to be directly overhead, an extreme heat wave is not currently forecast. Based on current data, it looks like high temperatures will level off in the mid to upper 70s for much of interior Western Washington with upper 80s to mid 90s through the weekend in eastern lowlands through the weekend.


8 to 14 Day Outlook, June 15 to June 21, 2021
  • Above average temperatures and below average precipitation are favored for the period.

Important Points About Next Week's Weather

South Central Washington
Remainder of the Week
  • Wind: Generally W with breezy areas Tue, light and variable Wed-Thu, W with breezy areas Fri.
  • Precipitation: Rain showers Mon night & Tue AM.
  • High Temps: Upper 70s Tue, low 80s Wed, near 90 Thu, mid 90s Fri.
  • Low Temps: Near 60 Mon night, low 50s Tue-Wed nights, upper 50s Thu night, Low 60s Fri night.
  • Sky Cover: Decreasing clouds Tue, mostly clear Wed-Fri.
Weekend
  • Wind: W and breezy Sat, S and generally light Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Mid 90s Sat & Sun.
  • Low Temps: Mid 60s Sat & Sun nights.
  • Sky Cover: Mostly clear.

North Central Washington
Remainder of the Week
  • Wind: Generally W with breezy areas Tue, light and variable Wed-Thu, W with breezy areas Fri.
  • Precipitation: Rain showers tapering off Tue.
  • High Temps: Mid 70s Tue, low 80s Wed, upper 80s Thu, low 90s Fri. Cooler in higher terrain.
  • Low Temps: Mid 50s Mon night, low 50s Tue-Wed night, upper 50s Thu night, low 60s Fri night. Cooler in higher terrain.
  • Sky Cover: Decreasing clouds Tue, mostly clear Wed-Fri.
Weekend
  • Wind: W and breezy Sat, S and generally light Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 90 Sat & Sun. Cooler in higher terrain.
  • Low Temps: Mid 60s Sat & Sun nights.
  • Sky Cover: Mostly clear.

Eastern Washington
Remainder of the Week
  • Wind: Generally W with breezy areas Tue, light and variable Wed-Thu, W with breezy areas Fri.
  • Precipitation: Rain showers tapering off Tue.
  • High Temps: Low 70s Tue, mid 70s Wed, low 80s Thu, mid 80s Fri. Warmer in the Lewis & Clark Valley.
  • Low Temps: Upper 50s Mon night, upper 40s Tue-Wed nights, low 50s Thu night, mid 50s Fri night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Decreasing clouds Thu night, mostly clear Wed-Fri.
Weekend
  • Wind: W and breezy Sat, S and generally light Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 80s Sat & Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Upper 50s Sat & Sun nights. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Mostly clear.

Western Washington
Remainder of the Week
  • Wind: SW with breezy areas Tue, generally light Wed-Thu, generally NW with breezy areas Fri.
  • Precipitation: Rain showers tapering off Tue night.
  • High Temps: Mid 60s Tue, near 70 Wed, mid 70s Thu-Fri. Cooler in higher terrain.
  • Low Temps: Mid 50s Mon night, low 50s Tue-Thu nights, mid 50s Fri night.
  • Sky Cover: Decreasing clouds Tue night, mostly clear Wed-Fri.
Weekend
  • Wind: NW with breezy areas along the coast and strait Sat, N with breezy areas on the coast Sun.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 70s Sat & Sun. Cooler in higher terrain and on the coast.
  • Low Temps: Mid 50s Sat & Sun nights. Cooler in higher terrain.
  • Sky Cover: Mostly clear.

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Washington State University