AgWeatherNet Weekly Weather Outlook for October 6 to October 12, 2012

Scattered Frost on Saturday Morning; Continued Dry and Warming into Next Week

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

Frost is likely across portions of Washington on Saturday morning, as high pressure and decreasing winds allow efficient radiational cooling to occur overnight. Despite significant warming aloft, isolated frost is again likely on Sunday morning, due to clear, dry, and stable conditions. Although pockets of frost remain a possibility into early next week, it will generally be a diminishing concern that will disappear later next week. The coldest areas will drop into the 20s, while other areas will fall into the 30s to low 40s this weekend. By early next week, the coldest areas will be around freezing, while most areas will fall into the mid 30s to mid 40s, before warming later in the week. The coldest temperatures will occur where winds are calm, and in sheltered areas away from water and urban centers.

Dry and sunny weather will continue, as temperatures begin to warm this weekend and into next week. However, with calm and stable nights, we are entering the time of year when not all of the warming aloft is translated to the surface. Highs in the mid 60s to mid 70s this weekend will warm into the upper 60s to 70s for next week. However, western Washington may see cooler highs later in the week, as clouds return to the area. Light northerly flow this weekend will diminish as a ridge of high pressure shifts over the region into early next week. By the middle of next week, the upper level flow will turn more westerly, as the ridge flattens and weakens. As the continental air is eroded by greater marine influence later next week, dew points and low temperatures will rise. It is possible that more active conditions may commence near the end of this outlook period. However, the details are uncertain, and there is still no indication of any significant rain for eastern Washington through next week. Overall, sunny warm days and clear cool nights will continue through the middle of next week, with generally warming conditions.

Temperatures
  • Near to slightly above normal highs this weekend.
  • Warming to above normal early next week.
  • Slight day-time cooling in western Washington later in the week.
  • Below normal overnight lows this weekend.
  • Warming to near normal early next week, and above normal later next week.

Rainfall
  • Mostly dry through the period.
  • A slight chance of rain in western Washington by next Friday.

Wind
  • Generally light through the middle of next week.
  • Possible increase late in the week.

Frost Risk Summary
  • Saturday morning: Scattered frost likely.
  • Sunday morning: Isolated frost likely.
  • Early next week: A slight and decreasing chance of isolated frost.
  • Later next week: Minimal to no chance of frost.

Important Points about Next Week's Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the upper 60s and lows in the upper 30s to low 40s.
Weekend
  • Mostly sunny and dry.
  • Highs in the mid 60s to low 70s on Saturday, and upper 60s to 70s on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and 30s to low 40s on Sunday morning.
Next Week
  • Mostly sunny and dry.
  • Highs in the 70s.
  • Lows in mid 30s to mid 40s early, and warming into the 40s later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the mid to upper 60s and lows around 40.
Weekend
  • Mostly sunny and dry.
  • Highs in the mid 60s to low 70s on Saturday, and upper 60s to mid 70s on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and 30s to low 40s on Sunday morning.
Next Week
  • Mostly sunny and dry.
  • Highs in the low to mid 70s.
  • Lows in the mid 30s to mid 40s early, and warming into the 40s later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the mid 60s and lows around 40.
Weekend
  • Mostly sunny and dry.
  • Highs in the 60s on Saturday, and mid 60s to low 70s on Sunday.
  • Lows in the mid 20s to mid 30s on Saturday morning, and 30s on Sunday morning.
Next Week
  • Mostly sunny and dry.
  • Highs in the mid 60s to mid 70s.
  • Lows in the mid 30s to low 40s early, and warming into the upper 30s to mid 40s later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid 60s and lows in the mid 40s.
Weekend
  • Mostly sunny and dry.
  • Highs in the 60s to mid 70s.
  • Lows in the upper 20s to 30s, except 40s near the coast and urban centers on Saturday morning.
  • Lows in the 30s and 40s on Sunday morning.
Next Week
  • Mostly sunny and dry early, with increasing clouds later in the week.
  • A slight chance of rain by next Friday.
  • Highs in the 60s to low 70s, with possible cooling later in the week.
  • Lows in the mid 30s to mid 40s early, and warming into the 40s later in the week.

Washington State University