AgWeatherNet Weekly Weather Outlook for December 17 to December 23, 2016

Cold and Mainly Dry This Weekend; Much Warmer and Active Next Week

Nic Loyd, Meteorologist, 509-786-9357

Winter will make one final appearance this weekend before rapidly retreating early next week. Today's surge of Canadian air should lead to very cold temperatures on Saturday, but the chill is expected to be short lived, as periodically stormy and much warmer conditions return early next week.

On Saturday, mainly dry and calm weather is likely, but the main story will be the frigid temperatures. Some eastern areas are forecast to begin the day below zero degrees, while certain western locales are anticipated to register lows in the teens. High temperatures should only rise into the upper 20s to 30s during the afternoon west of the Cascades, while eastern parts of the state may remain in the teens. Slightly warmer conditions are likely on Sunday, as the circulation pattern begins a major transition.

The atmospheric flow should turn westerly early next week, causing milder Pacific air to flood into the region. Increased wind from a low pressure area passing just north of the state is likely to effectively scour out any remaining cold air in the eastern lowlands by Monday or Tuesday. The storm passage is expected to bring significant western rain early in the week, along with rain and high elevation snow in the mountains. Eastern areas could also see some rain or snow at times, although south central Washington may remain relatively dry due to strong, downslope wind gusts that could reach 50 mph. In fact, spots like the Tri-Cities and Walla Walla could see temperatures in the 50s on Tuesday as a result of the Chinook winds. Although calmer intervals are likely to occur during this time frame, another storm is possible later in the week. The potential exists for slight cooling at the end of this outlook period, but temperatures would likely remain near to above normal.

Temperatures
  • Very cold on Saturday, and warmer on Sunday.
  • Becoming much warmer and trending above normal next week.
  • Possibly cooler later in the period.

Precipitation
  • A chance of snow or rain this weekend in the west.
  • Rain likely at times in the west next week.
  • A chance of rain, mix, or snow at times in the east next week.
  • Mostly dry, with a chance of rain at times next week in south central Washington.

Wind
  • Breezy to windy at times next week, especially on Tuesday.

8 to 14 Day Outlook - December 24, 2016 to December 30, 2016
  • Overall, near average temperatures and near average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week's Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the mid 30s to mid 40s and lows in the 20s to low 30s.
Weekend
  • Mostly dry.
  • Highs in the mid teens to mid 20s on Saturday, and 20s on Sunday.
  • Lows in the single digits above or below zero on Saturday morning, and single digits to low teens on Sunday morning.
Next Week
  • A chance of rain at times, especially on Monday night. Drier around Wednesday.
  • Windy at times, especially on Tuesday.
  • Highs in the 30s to mid 40s on Monday, and then warmer.
  • Lows in the upper teens to 20s on Monday morning, and then warmer.

North Central Washington
  • Normal conditions for this time of the year would be highs in the 30s and lows in the low to mid 20s.
Weekend
  • Mostly dry.
  • Highs in the teens on Saturday, and upper teens to mid 20s on Sunday.
  • Lows in the single digits above or below zero on Saturday morning, and single digits to low teens on Sunday morning.
Next Week
  • A chance of rain or snow at times. Drier around Wednesday.
  • Highs in the 30s on Monday, and then warmer.
  • Lows in the mid teens to 20s on Monday morning, and then warmer.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the mid 30s to around 40 and lows in the 20s to around 30.
Weekend
  • Mostly dry. A slight chance of snow on Sunday.
  • Highs in the teens on Saturday, and upper teens to 20s on Sunday.
  • Lows in the single digits above or below zero on Saturday morning, and single digits to low teens on Sunday morning.
Next Week
  • Windy at times. Rain or snow likely at times early in the week.
  • Drier around Wednesday, and then a chance of rain later in the week.
  • Highs in the 30s to low 40s on Monday, and then warmer.
  • Lows in the upper teens to 20s on Monday morning, and then warmer.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid 40s to around 50 and lows in the mid to upper 30s.
Weekend
  • Mostly dry through early Sunday, with a chance of snow or rain.
  • Rain developing on Sunday at the coast and in the north.
  • Highs in the 30s on Saturday, and mid 30s to mid 40s on Sunday.
  • Lows in the mid teens to mid 20s on Saturday morning, and mid 20s to low 30s on Sunday morning.
Next Week
  • Rain likely at times. Drier around Wednesday.
  • Highs in the 40s to low 50s on Monday, and then warmer, and cooler later in the week.
  • Lows in the 30s to low 40s on Monday morning, and then warmer, and possibly cooler later in the week.
Washington State University