AgWeatherNet Weekly Weather Outlook for April 27 to May 3, 2013

Windy and Cooler Early Next Week; Warmer and Calmer Later Next Week

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

The frost risk will be moderate to high on Tuesday and Wednesday mornings (April 30 and May 1), with low temperatures east of the Cascades ranging from the mid to upper 20s in colder areas to the 30s to low 40s elsewhere. Other weather highlights for the period include a half inch or more of rain on Sunday night in western Washington, snow in the high elevations of the Cascades on Sunday night and Monday morning, strong winds and blowing dust on Monday, and very warm temperatures later next week.

The spring weather roller coaster ride will continue for the upcoming week, with a plethora of weather hazards expected as we transition into May. Similar to most recent Saturdays over the last month, the weather will become windy again this weekend during the transition from the recent warmth to cooler and more unsettled weather for a brief time. A weak storm system will cross the state on Saturday and Saturday night, bringing showers to northwestern areas. Onshore flow will bring cooler weather to interior western Washington on Saturday, while warmth lingers east of the Cascades.

A stronger system will arrive late on Sunday, which will pack more of a punch. Rain will develop on Sunday at the coast, before spreading inland overnight and reaching eastern Washington on Monday morning. Low temperatures on Monday morning will be relatively mild due to moisture and wind, although limited warming is expected during the afternoon as cold air pours into the region. Showers will linger into Monday night in some areas, followed by drier weather for Tuesday and beyond. Although central Washington will remain mostly dry due to rain shadow effects, a stronger burst of wind up to 55 mph will occur on Monday as the cold front crosses the region. Monday and Tuesday will be cool days, with below normal temperatures in the 50s and 60s continuing into Wednesday morning, before sunny and warmer weather arrives by afternoon. Potentially significant warming into the 70s and even 80s may occur by Thursday and Friday of next week, along with a return to sunshine and calm conditions, as a ridge of high pressure regains control of the weather.

Temperatures
  • Above normal east of the Cascades, and near normal in western areas on Saturday.
  • Cooling to near normal statewide on Sunday.
  • Below normal from Monday afternoon to Wednesday morning.
  • Warming to above normal state wide by later in the week.

Rainfall
  • Scattered showers from Saturday into Sunday morning in western Washington, especially in the north.
  • Rain developing on Sunday in northwestern Washington and spreading to the Pullman and Spokane areas by Monday morning.
  • A chance of lingering showers through Monday night in western and eastern Washington.
  • Mostly dry in central Washington through the period.
  • Mostly dry statewide beginning on Tuesday.

Wind
  • Windy east of the Cascades this weekend.
  • Becoming very windy Sunday night into Monday. Sustained winds of 25 to 30 mph, with gusts up to 55 mph.
  • Lighter winds beginning on Tuesday.

Frost Risk Summary
  • This weekend: Low risk.
  • Next week: Low risk on Monday morning, and moderate to high risk on Tuesday and Wednesday mornings, and then low risk thereafter.

8 to 14 Day Outlook - May 4 to May 10
  • Overall, near average temperatures and near average precipitation are expected during the 8 to 14 day period.

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 to low 70s and lows in the upper 30s to mid 40s.
Weekend
  • Partly sunny and breezy.
  • Highs in the upper 60s to 70s on Saturday, and mid 60s to mid 70s on Sunday.
  • Lows in the 40s to low 50s on Saturday morning, and upper 30s to 40s on Sunday morning.
Next Week
  • Windy on Monday.
  • Mostly dry, and becoming sunny by mid week.
  • Highs in the upper 50s to mid 60s on Monday and Tuesday, and warming into the mid 70s to mid 80s later in the week.
  • Lows in the 40s to around 50 on Monday morning, and upper 20s to 30s on Tuesday and Wednesday mornings, and then warmer later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 60s and lows in the low 40s.
Weekend
  • Partly sunny and breezy.
  • Highs in the mid 60s to mid 70s on Saturday, and 60s to low 70s on Sunday.
  • Lows in the 40s to low 50s on Saturday morning, and upper 30s to mid 40s on Sunday morning.
Next Week
  • Mostly dry, and becoming sunny by mid week.
  • Highs in the 50s to low 60s on Monday and Tuesday, and warming into the mid 70s to low 80s later in the week.
  • Lows in the low to mid 40s on Monday morning, and upper 20s to 30s on Tuesday and Wednesday mornings, and then warmer later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the low to mid 60s and lows in the upper 30s to around 40.
Weekend
  • Partly cloudy and breezy.
  • Highs in the mid to upper 60s on Saturday, and upper 50s to mid 60s on Sunday.
  • Lows in the low to mid 40s on Saturday morning, and upper 30s to mid 40s on Sunday morning.
Next Week
  • Rain likely on Monday morning and windy. Mostly dry beginning on Tuesday.
  • Highs in the low to mid 50s on Monday and Tuesday, and warming into the upper 60s to 70s later in the week.
  • Lows in the low to mid 40s on Monday morning, and upper 20s to mid 30s on Tuesday and Wednesday mornings, and then warmer later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the low to mid 60s, except around 60 at the coast, and lows in the low to mid 40s, except around 40 near Olympia.
Weekend
  • A chance of showers from Saturday to Sunday morning, especially in northwestern areas.
  • Rain developing on Sunday at the coast and spreading inland overnight.
  • Highs ranging from the mid 50s at the coast to around 70 in the south on Saturday, and 50s to mid 60s on Sunday.
  • Lows in the 40s.
Next Week
  • Rain likely early on Monday, and then showers at times. Mostly dry beginning on Tuesday.
  • Highs in the 50s on Monday, and warming into the upper 60s to 70s by mid to late week, except cooler at the coast late in the week.
  • Lows in the 40s on Monday morning, and 30s to low 40s on Tuesday and Wednesday mornings, and then warmer later in the week.

Washington State University