AgWeatherNet Weekly Weather Outlook for December 7 to 13, 2013

Cold and Dry This Weekend; Becoming More Active and Milder Next Week

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

Cold and dry northerly flow will continue this weekend across Washington, as arctic air remains firmly in place east of the Cascades. Well below average temperatures are likely to persist, although skies will be mostly sunny. Conditions in the mountains and western areas will become milder early next week, although mainly dry weather should persist through Tuesday.

Thereafter, a more unsettled period will commence. The details may change, but it appears that a mild storm will move into Washington on Wednesday or Thursday. Although the precipitation could begin as a brief mix for a few cold western areas, a quick transition to rain is likely. In fact, most areas will receive rain from the start. However, the transition will be slower east of the Cascades, as cold air will be harder to remove. It is likely that precipitation would begin as snow or a mix east of the Cascades, before changing to a mix and then rain before tapering. Once the storm passes, temperatures will rise east of the Cascades. At the same time, cooler air aloft will cause dropping snow levels in the mountains later next week. Overall, the transition from cold and dry to mild and wet could be messy in eastern areas during the middle of next week.

Temperatures
  • Well below average this weekend.
  • Becoming milder early next week in the west.
  • Becoming milder in eastern areas later next week.

Precipitation
  • Mainly dry this weekend and early next week.
  • Rain, mixed precipitation, or snow possible by next Wednesday or Thursday.

Wind
  • Breezy on Saturday morning, and generally decreasing to light or moderate this weekend.
  • Possibly stronger by next Wednesday or Thursday.

Frost Risk Summary
  • This weekend: High risk.
  • Next week: Moderate to high risk in western areas early in the week, and decreasing risk by mid week.
  • High risk in eastern areas early in the week, and possibly decreasing later in the week.

8 to 14 Day Outlook - December 14 to December 20
  • Overall, near to above average temperatures and near to above average rainfall 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 low to mid 40s and lows in the mid 20s to low 30s.
Weekend
  • Mostly sunny.
  • Highs in the upper teens to mid 20s on Saturday, and upper teens to 20s on Sunday.
  • Lows in the mid single digits to low teens on Saturday morning, and single digits on Sunday morning.
Next Week
  • A chance of snow or mixed precipitation by Wednesday or Thursday, and eventually changing to rain.
  • Highs in the 20s to low 30s early, and warming into the mid 30s to low 40s later in the week.
  • Lows in the teens early, and then 20s to mid 30s later in the week.

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.
Weekend
  • Mostly sunny.
  • Highs in the mid teens to mid 20s on Saturday, and upper teens to mid 20s on Sunday.
  • Lows in the mid single digits to mid teens on Saturday morning, and single digits on Sunday morning.
Next Week
  • A chance of snow by Wednesday or Thursday, and eventually changing to mixed precipitation or rain.
  • Highs in the 20s early, and warming into the 30s later in the week.
  • Lows in the teens early, and then 20s to low 30s later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the upper 30s and lows in the upper 20s.
Weekend
  • Mostly sunny.
  • Highs in the teens to low 20s on Saturday, and mid teens to mid 20s on Sunday.
  • Lows in the single digits on Saturday morning, and around zero on Sunday morning.
Next Week
  • A chance of snow or mixed precipitation by Wednesday or Thursday, and eventually changing to rain.
  • Highs in the 20s to low 30s early, and warming into the 30s to around 40 later in the week.
  • Lows in the teens to low 20s early, and then 20s to mid 30s later in the week.

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.
Weekend
  • Partly sunny.
  • Highs in the 30s on Saturday, and 30s to mid 40s on Sunday.
  • Lows in the mid teens to mid 20s.
Next Week
  • Rain likely by Wednesday.
  • A chance of mixed precipitation in isolated areas at the onset.
  • Highs in the upper 30s to mid 40s early, and then 40s to mid 50s.
  • Lows in the mid 20s to mid 30s early, and then 30s to mid 40s.

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