AgWeatherNet Weekly Weather Outlook for Dec 13 to Dec 19, 2019

Drying trend with active weather by week's end

Craig Oswald, Field Meteorologist, 509-786-9256
Joe Zagrodnik, Postdoctoral Research Associate

Discussion:

As the rain and snow shower activity continues to wind down through much of the state today (Friday), those of us east of the Cascades will find a fairly enjoyable dry and partly sunny weekend. However, the threat of precipitation is not totally out of the picture as a strong Aleutian low will continue to leave much of the Pacific Northwest unsettled with a low threat for scattered showers to move in from the west through Sunday.

Residents along the eastern border of the state will be under a higher threat for precipitation and mostly cloudy skies this weekend as snow showers concentrated over the higher terrain of Idaho look to impact parts of eastern Washington as well, mainly in the form of mixed precip. While residents west of the Cascades, unfortunately, will continue to experience dreary conditions through the weekend as scattered rain showers at low elevations and snow showers down to pass level will prevail. Parts of the Cascades look to receive several inches of snow.

Much of the period will also be defined by foggy conditions during the overnights and mornings, as well as generally light winds.

The end of the week will likely see a return to wet weather as a low pressure system, driven in part by a strong Pacific jet, looks to develop over the Pacific Ocean. This system is expected to crash into northern California bringing rain and snow from the south/southwest into the state of Washington, kicking off another round of rather active weather.


Key Points:

  • Becoming slightly cooler and drier this weekend, with the slight chance of a scattered shower.
  • Generally dry next week with rain and snow showers to return nearly statewide by Thursday.

Temperatures
  • Temps continually decreasing through the weekend.
  • Temps then remaining steady through the week.

Precipitation
  • Mostly dry with a few scattered showers possible this weekend (precip likely west of the Cascades).
  • Dry conditions expected for the week until Thursday night.

Wind
  • Light winds expected state wide for the period with slightly breezier conditions through higher terrain and the Basin at times.

8 to 14 Day Outlook Dec 20, 2019 to Dec 26, 2019
  • Slightly above average temperatures and slightly above average precipitation are expected during the 8 to 14 day time frame. The weekend and first part of the week look to be impacted by a low pressure system with rain showers and high terrain snow showers before trending drier by week's end.

Important Points about Next Week’s Weather

South Central Washington
Weekend
  • Dry conditions expected. Partly sunny. Low threat for a stray rain shower from the west through the weekend.
  • Highs in the upper 40s Friday afternoon, low 40s Saturday, and upper 30s on Sunday. Slightly cooler to the north.
  • Lows near 30 Saturday morning, and upper 20s Sunday morning. Slightly cooler to the north.
Next Week
  • Dry conditions look to continue for most of the week with the low threat for showers diminished by Monday morning. Partly sunny to mostly cloudy. Snow showers likely for Thursday.
  • Highs in the mid to upper 30s.
  • Lows in the low to mid 20s.

North Central Washington
Weekend
  • Dry conditions expected. Partly sunny. Low threat for a stray rain shower/high terrain snow shower from the west/northwest through the weekend.
  • Highs in the upper 30s Friday afternoon, mid 30s Saturday, and lower 30s on Sunday. Cooler through the high terrain/east.
  • Lows in the upper 20s Saturday morning, lower 20s Sunday morning. Cooler through the high terrain/east.
Next Week
  • Dry conditions look to continue for most of the week with the low threat for showers diminished by Monday morning. Partly sunny to mostly cloudy. Snow showers likely for Thursday.
  • Highs in the mid 30s. Cooler through the high terrain/east.
  • Lows in the low to mid 20s. Cooler through the high terrain/east.

Eastern Washington
Weekend
  • Chance of rain/snow showers, mainly on Friday and Saturday. Mostly cloudy. Lingering threat for showers in far SE Washington through Sunday.
  • Highs in the lower 40s Friday afternoon, upper 30s Saturday, and mid 30s on Sunday. Slightly warmer to the south.
  • Lows near 30 Saturday morning, and upper 20s on Sunday morning.
Next Week
  • Dry conditions look to continue for most of the week with the low threat for showers diminished by Monday morning. Partly sunny to mostly cloudy. Snow showers likely for Thursday.
  • Highs in the mid 30s.
  • Lows in the low to mid 20s.

Western Washington
Weekend
  • Scattered rain showers at lower elevations and snow showers near pass level through the weekend. Overcast. The Cascades will see extended periods of snow fall throughout the weekend.
  • Highs in the upper 40s Friday afternoon, and mid 40s Saturday and Sunday.
  • Lows in the mid 30s on Saturday and Sunday mornings.
Next Week
  • Conditions to become mostly dry by mid day Monday with a low threat for rain showers and high terrain snow showers through much of the week. Mostly cloudy. Rain showers and high terrain snow showers likely for Thursday.
  • Highs in the mid 40s. Near 30 for the Cascades.
  • Lows in the mid to upper 30s. Upper 20s for the Cascades.

Washington State University