AgWeatherNet Weekly Outlook for 28 May to 03 June 2021

Heat wave to start the week, moderating toward the weekend

Mark Ingalls, AgWeatherNet Intern

Note: In observation of Memorial Day, there will be no outlook issued Monday, May 31.

Synopsis:

A ridge of high pressure building over the Pacific Northwest will result in warming temperatures and dry conditions. Look for mostly cloudy skies for much of Western Washington through the weekend with partly cloudy skies to the east. The hottest day is likely to be Tuesday west of the Cascades and Wednesday east of the Cascades before a shortwave trough weakens the ridge to bring breezy conditions and some chances of rain for Western Washington going into Thursday.

Discussion:

Warming temperatures are the main weather story over the next several days thanks to a ridge of high pressure building over the region. Flow remains generally westerly through the weekend to provide partly to mostly cloudy skies in Western Washington with even a few showers in rainforest areas of the Olympics and North Cascades. The moisture won't be enough to bring increased cloud cover to Eastern Washington, however, so folks there should look for clear to partly cloudy skies.

Sunday night into Monday the ridge is likely to amplify further to bring much warmer temperatures. The hottest day of the week to the west of the Cascades is likely to be Tuesday with highs in the 80s away from the Coast and Puget Sound generally south of Everett. Eastern Washington will see the warming last into Wednesday with the lowest elevations likely to be between 100 and 105. A few daily high temperature records may be broken with this first sojourn into triple digit weather of the year.

A shortwave trough is expected to begin impacting Western Washington on Wednesday with the trough axis crossing the state Thursday. This will bring with it cooler temperatures, increased clouds, and a stiff breeze to typical windy spots across Washington. As the trough passes through, high temperatures are likely to drop by about five to ten degrees. Models indicate a more active pattern leading into the weekend. While this may continue to cool down temperatures and bring some more shots at windy conditions, widespread precipitation does not appear likely.

Despite beneficial rain showers across much of the Pacific Northwest over the last few weeks, the drought continues to worsen. This week's drought monitor update from the National Drought Mitigation Center now notes extreme drought (D3/4) conditions within about 30 miles of Prosser and about 15 miles of Waitsburg. No major change to other areas, which keeps Yakima and Vancouver in severe drought (D2/4) conditions and Spokane in moderate drought (D1/4) conditions.

While the Puget Sound Region is abnormally dry, that area is not currently in drought. Most of the Cascades and Olympics continue to have a healthy snowpack with the exception of the Naches and Klickitat drainage basins where the snow water equivalent value currently sits between two thirds and three quarters of average for late May.


8 to 14 Day Outlook, June 04 to June 10, 2021
  • Above average temperatures and below average precipitation are favored for the period.

Important Points About Next Week's Weather

South Central Washington
Weekend
  • Wind: Light and variable.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 80s Sat, upper 80s Sun.
  • Low Temps: Low 40s Fri night, mid 40s Sat night, low 50s Sun night. Cooler in sheltered areas.
  • Sky Cover: Partly cloudy.
Next Week
  • Wind: Generally W. Breezy areas Wed, windy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Low 90s Mon, upper 90s Tue, low 100s Wed, mid 90s Thu.
  • Low Temps: Low 60s Mon night, mid 60s Tue-Wed nights, low 60s Thu night. Cooler in sheltered areas.
  • Sky Cover: Partly cloudy.

North Central Washington
Weekend
  • Wind: Light and variable.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 80 Sat, upper 80s Sun. Cooler in higher terrain.
  • Low Temps: Mid 40s Fri night, mid 50s Sat night, upper 50s Sun night. Cooler in higher terrain and sheltered areas.
  • Sky Cover: Partly cloudy.
Next Week
  • Wind: Generally W. Breezy areas Wed, windy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Near 90 Mon, mid 90s Tue, upper 90s Wed, near 90 Thu. Cooler in higher terrain.
  • Low Temps: Low 60s Mon night, mid 60s Tue-Wed nights, low 60s Thu night. Cooler in higher terrain and sheltered areas.
  • Sky Cover: Partly cloudy.

Eastern Washington
Weekend
  • Wind: Light and variable.
  • Precipitation: Dry conditions expected.
  • High Temps: Mid 70s Sat, low 80s Sun. Warmer in the Lewis & Clark Valley.
  • Low Temps: Low 40s Fri night, mid 40s Sat night, near 50 Sun night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Partly cloudy.
Next Week
  • Wind: Generally W. Breezy areas Wed, windy Thu.
  • Precipitation: Dry conditions expected.
  • High Temps: Upper 80s Mon, low 90s Tue, mid 90s Wed, near 90 Thu. Warmer in the Lewis & Clark Valley.
  • Low Temps: Mid 50s Mon night, near 60 Tue-Wed nights, upper 50s Thu night. Warmer in the Lewis & Clark Valley.
  • Sky Cover: Partly cloudy.

Western Washington
Weekend
  • Wind: Light and variable.
  • Precipitation: Low chance upslope showers in the Olympics and Cascades Sun.
  • High Temps: Near 70 Sat, mid 70s Sun. Cooler in higher terrain and along the Coast.
  • Low Temps: Upper 40s Fri night, near 50 Sat night, mid 50s Sun night. Cooler in higher terrain.
  • Sky Cover: Partly to mostly cloudy.
Next Week
  • Wind: Generally N and light Mon-Tue. Becoming W with breezy areas Wed-Thu.
  • Precipitation: Low chance of showers Thu.
  • High Temps: Mid 70s Mon, near 80 Tue, upper 70s Wed, mid 70s Thu. Cooler in higher terrain and along the Coast.
  • Low Temps: Upper 50s Mon night, near 60 Tue-Wed nights, upper 50s Thu night. Cooler in higher terrain.
  • Sky Cover: Partly cloudy Mon-Wed, mostly cloudy Thu.

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