AgWeatherNet Weekly Weather Outlook for November 28 to December 6, 2013

Becoming Active This Weekend; Arctic Outbreak Next Week

Nic Loyd, Meteorologist, 509-786-9357
Gerrit Hoogenboom, Director, 509-786-9371

Major weather changes are expected during the Holiday weekend, and potentially hazardous conditions are possible beginning on Sunday and continuing into next week. Overall, the upcoming outlook period will be characterized by 3 very distinct weather regimes: Uneventful, Stormy, and Cold.

Rather benign weather is likely to persist through Thanksgiving Day and Friday, as temperatures slowly moderate in the east. However, rain will develop in western areas on Saturday, and may become heavy by Sunday, as a strong storm passes through the state. For eastern Washington, rain is likely by Sunday around the Idaho border, although increasingly strong southwesterly winds will be the larger story. The strong mixing will improve air quality statewide, while briefly warming the temperatures in central Washington, especially at night. Heavy snow is also possible in the mountains on Sunday.

By Monday, an arctic cold front is expected to transit Washington, as winds swing around to the north, and temperatures plummet. While most of the precipitation will be over by the time the dry and cold air arrives, some light lowland snow is possible on Monday. Otherwise, cold temperatures and potentially bitter wind chills are expected next week. Temperatures in Washington in early December may be the coldest in several years. It is possible that the coldest areas of eastern Washington may drop below zero on any clear and calm nights, while high temperatures could be as cold as 15 to 20 degrees in northeastern areas of Washington.

Temperatures
  • Slightly milder but still cool through Friday, and then milder on Saturday and Sunday in eastern areas.
  • Becoming much colder on Monday.
  • Cold next week.

Precipitation
  • Mainly dry through Friday, with rain developing on Friday night in the north.
  • Rain in western and eastern areas on Saturday and especially Sunday, with a slight chance of rain in central Washington.
  • A chance of snow at times next week, but mostly dry overall.

Wind
  • Generally light through Friday.
  • Becoming windy by Sunday, especially in central and eastern Washington.
  • Breezy at times next week.

Frost Risk Summary
  • This weekend: Moderate to high risk on Thanksgiving morning, and then decreasing risk.
  • Low risk on Sunday morning.
  • Next week: High risk.

10 to 16 Day Outlook - December 7 to December 13
  • Overall, near to below average temperatures and below average precipitation are expected during the 10 to 16 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 low 40s and lows in the upper 20s.
Holiday Weekend
  • Mostly dry on Thanksgiving Day and Friday.
  • A slight chance of rain, and windy on Sunday.
  • Highs in the 40s to around 50 on Saturday, and mid 40s to mid 50s on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and mid 30s to low 40s on Sunday morning.
Next Week
  • Mostly dry. A slight chance of snow at times.
  • Highs in the mid 30s to mid 40s on Monday, and then 20s.
  • Lows in the upper 20s to mid 30s on Monday morning, and then teens to low 20s.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 30s and lows in the mid to upper 20s.
Holiday Weekend
  • Mostly dry on Thanksgiving Day and Friday.
  • A chance of rain, and breezy on Sunday.
  • Highs in the upper 30s to 40s on Saturday, and 40s to around 50 on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and 30s to low 40s on Sunday morning.
Next Week
  • Mostly dry. A slight chance of snow at times.
  • Highs in the 30s on Monday, and then 20s.
  • Lows in the mid 20s to mid 30s on Monday morning, and then teens to low 20s.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the upper 30s to around 40 and lows in the upper 20s.
Holiday Weekend
  • Mostly dry on Thanksgiving Day and Friday.
  • Rain likely on Sunday and windy.
  • Highs in the upper 30s to 40s on Saturday, and 40s to low 50s on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and 30s to low 40s on Sunday morning.
Next Week
  • Snow or rain showers likely on Monday.
  • Mostly dry, with a slight chance of snow at times thereafter.
  • Highs in the 30s on Monday, and then 20s.
  • Lows in the mid 20s to mid 30s on Monday morning, and then teens to low 20s.

Western Washington
  • Normal conditions for this time of the year would be highs in the upper 40s to around 50 and lows in the mid to upper 30s.
Holiday Weekend
  • Mostly dry on Thanksgiving Day and Friday.
  • Rain, locally heavy on Sunday, with snow in the mountains.
  • Highs in the mid 40s to low 50s.
  • Lows in the upper 30s to 40s.
Next Week
  • Rain or snow showers on Monday.
  • Mostly dry, with a chance of rain or snow at times thereafter.
  • Highs in the mid 30s to mid 40s on Monday, and then 30s, except upper 20s in Whatcom County.
  • Lows in the 30s on Monday morning, and then 20s, except upper teens in Whatcom County.

Note: AgWeatherNet will not issue a weekly weather outlook on Friday, November 29 due to the Thanksgiving Holiday. Please look for the next weekly outlook on Friday, December 6, 2013. The AgWeatherNet team wishes you a Happy Thanksgiving!

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