AgWeatherNet Weekly Weather Outlook for Feb 14 to Feb 20, 2020

A showery weekend followed by a dry trend with temps remaining near average.

Craig Oswald, Field Meteorologist, 509-786-9256
Joe Zagrodnik, Postdoctoral Research Associate
Mark Ingalls, AgWeatherNet Intern

Discussion:

A bit of unsettled weather appears to be in store for much of the weekend. Showers look to be mostly scattered and light except in western Washington where a steadier rain will fall on Saturday. Precipitation type looks to be mostly rain/snow in lowland areas with only some small accumulations expected during the overnights in most cases, while upland areas will trend toward snow with a few inches of accumulation expected through the weekend. Western Washington will see exclusively rain, with the Cascades to receive snow. Snow will be down to pass levels with a rain/snow mix expected during the day and snow during the night. Significant snowfall accumulations of 10-18 inches are anticipated at Stevens, Snoqualmie, and White Pass with the majority of the snow falling during the day on Saturday.

Conditions look to trend toward dry statewide (yes, even throughout western Washington!) during the day/night Monday. This is due to a high amplitude ridge and subsequent strong high pressure that is expected to build into the western part of the U.S./southern Canada. This looks to bring much clearer skies as well, making for a nicer stretch of weather that could be utilized for some early pruning in some locales. Tuesday is projected to be the nicest day with mostly clear skies statewide. Near average temperatures are also expected to remain in place through the week. By week's end (Thursday-ish) a few scattered showers look to start moving back into western Washington, but this activity is not anticipated to be widespread.

The weather pattern that unfortunately brought flooding conditions to much of the region last weekend also brought warmer temperatures that lasted into the beginning of the week. On Tuesday, Yakima reached a high temperature of 61 which set a new record for that day. Moses Lake and Ephrata also broke a daily record with Wenatchee falling just short of their record high.

Recent heavy snow in the mountains has helped to improve the snowpack across the Pacific Northwest. At the beginning of January, many areas had snowpack levels that were approximately 50% or less when compared to normal. As of February 12, all of the Washington basins were reported by the National Water and Climate Center as having near or above average snowpack. Drought conditions have improved in the eastern portion of the state. This week, Walla Walla and Columbia Counties were removed from the drought area. Weak drought conditions remain in place around the Tri-Cities, Yakima, and Wenatchee.


Key Points:

  • Mostly scattered rain and snow showers for the weekend and into Monday before trending dry.
  • A generally uneventful week.

Temperatures
  • Temps hovering very near average state wide.

Precipitation
  • Rain/snow and upland snow showers, with more consistent mountain snow through the weekend.
  • Several inches of snow accumulation expected at pass levels through the weekend.
  • Precip generally tapering off state wide Monday/Monday night and remaining mostly dry through the week.

Wind
  • Somewhat breezy conditions through the weekend with generally S/SW winds, particularly through the Basin and Palouse with a few gusts into the 35 mph range possible.
  • Winds slowing Monday night with generally light wind for the remainder of the week.

8 to 14 Day Outlook – Feb 21 to Feb 27, 2020
  • Average temperatures and slightly above average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week's Weather

South Central Washington
Weekend
  • Chance of rain showers through the weekend and rain/snow through upland areas, mostly toward the Blue and Cascade Mountains. Greatest chance Saturday into Sunday. No significant snow accumulations anticipated. Slightly drier in areas like the Tri-Cities and Othello. Mostly sunny to overcast.
  • Highs in the low 50s Friday, near 50 Saturday, and low 50s Sunday.
  • Lows in the upper 30s through the weekend.
Next Week
  • Isolated showers possible Monday, mainly east of the Tri-Cities. Dry through the remainder of the week aside from a stray rain/snow shower near the Blues. Sunny to overcast.
  • Highs near 50 Monday and low 50s Tuesday. Near 50 again Wednesday and low 50s Thursday.
  • Lows in the low 30s Monday and Tuesday mornings. Upper 20s Wednesday morning and near 30 Thursday morning.

North Central Washington
Weekend
  • Scattered light rain/snow showers and upland snow showers. Showers becoming more limited to upland areas Sunday. Generally small snow accumulations in lowland areas and a couple of inches in upland areas. Mostly sunny to overcast.
  • Highs in the low 40s Friday, and near 40 Saturday and Sunday . Cooler throughout higher terrain.
  • Lows in the upper 20s Saturday and Sunday mornings. Cooler throughout higher terrain.
Next Week
  • Mostly isolated mountain showers Monday before trending dry through the day. Dry conditions expected through the week. Mostly sunny to overcast.
  • Highs near 40 Monday and low 40s Tuesday. Near 40 Wednesday and Thursday. Cooler throughout higher terrain.
  • Lows in mid 20s through the week. Cooler throughout higher terrain.

Eastern Washington
Weekend
  • Scattered light lowland daytime rain and nighttime rain/snow showers. Precip trending toward snow in upland areas. Generally small snow accumulations in lowland areas. Drier toward the Basin with precip becoming more widespread Sunday. Occasional patchy fog. Mostly sunny to overcast.
  • Highs in the low 40s Friday and Saturday, upper 30s Sunday.
  • Lows in the low 30s Saturday and Sunday mornings.
Next Week
  • Showers tapering off through the day Monday. Mostly dry for the remainder of the week with a low threat for a stray rain/snow shower along far eastern WA/near the Blues. Sunny to overcast.
  • Highs in the upper 30s Monday and Tuesday. Near 40 Wednesday and Thursday.
  • Lows in the upper 20s Monday morning and mid 20s Tuesday morning. Mid 20s Wednesday morning and near 30 Thursday morning.

Western Washington
Weekend
  • Continued light rain and light to moderate mountain snow showers. Snow accumulations of 10-18 inches at pass levels. Occasional patchy fog. Mostly cloudy to overcast.
  • Highs in the upper 40s Friday, and mid 40s Saturday and Sunday. Much cooler throughout the Cascades/Olympics.
  • Lows in the upper 30s Saturday morning and Sunday mornings. Much cooler throughout the Cascades/Olympics.
Next Week
  • Precip tapering off Monday night. Dry through the first part of the week with some showers beginning to move back in around Thursday. Sunny to overcast.
  • Highs in the upper 40s Monday and Tuesday. Low 50s Wednesday and Thursday. Much cooler throughout the Cascades/Olympics.
  • Lows in the mid 30s Monday morning, and low 30s Tuesday morning. Low 30s Wednesday morning, and mid 30s Thursday morning. Much cooler throughout the Cascades/Olympics.

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