AgWeatherNet Weekly Weather Outlook for April 7 to April 13, 2018

Rain and Wind on Saturday; Variable and Active Next Week

Nic Loyd, Meteorologist, 509-786-9357

An unusually strong April low pressure system will approach Washington tonight, before gradually weakening and moving inland across British Columbia on Saturday. The result should be a variety of weather related concerns, including widespread rainfall and increasing winds across the state. While certainly not unprecedented, this sort of pattern is more reminiscent of an autumn storm than a typical spring disturbance. Several ingredients should come together to create stormy conditions across the region, including a fast jet stream and abundant moisture.

The heaviest amounts are likely to occur in the mountains, but just about everywhere is expected to see a wetting rain. Winds are predicted to be quite blustery, and gusts may exceed 50 mph in spots. As downslope flow resumes, Sunday looks to be drier for central Washington, although breezes and at least western showers could continue.

A brief interlude is anticipated for Monday, which means that isolated morning frost is forecast to give way to a drier, calmer, and warmer afternoon. Still, entirely clear skies are possible but not likely. In such dynamic and changeable patterns, the clouds from the next system are often approaching not long after the previous storm has exited.

Another storm is set to arrive around Tuesday, with additional rain and wind at that time. Otherwise, active and variable conditions seem poised to linger later in the period, and perhaps for the foreseeable future. Overall, cooler temperatures may arrive later next week as well.

The good news is that the irrigation demand may not be too high early in this growing season, although good pollination weather could be limited to only brief intervals.


Key Points:

  • Stormy on Saturday, with widespread rain and wind, and perhaps isolated thunderstorms
  • Mountain snowmelt, increased stream flows, and mudslides are possible
  • High mountain snow on Saturday night / Sunday
  • Isolated frost possible on Monday morning
  • Another storm likely by Tuesday or Wednesday
  • Variably unsettled weather thereafter


Temperatures
  • Generally slightly above normal.

Precipitation
  • Rain statewide on Saturday, and western showers on Sunday.
  • Rain at times starting around Tuesday, and mainly in the west.

Wind
  • Becoming windy on Saturday, and breezy on Sunday.
  • Possibly windy on Tuesday, and at times later next week.

8 to 14 Day Outlook - April 14, 2018 to April 20, 2018
  • Overall, near to below average temperatures and near to above 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 60s and lows in the mid 30s to low 40s.
Weekend
  • Rain likely, mainly early on Saturday morning.
  • Highs in the upper 50s to mid 60s on Saturday, and 60s on Sunday.
  • Lows in the mid to upper 40s on Saturday morning, and mid 40s to low 50s on Sunday morning.
Next Week
  • Mostly dry on Monday. A slight chance of rain at times starting on Tuesday.
  • Highs in the mid to upper 60s on Monday, and then cooler.
  • Lows in the mid 30s to low 40s on Monday morning, and then warmer, and possibly cooler later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the low to mid 60s and lows in the mid 30s to low 40s.
Weekend
  • Rain likely, mainly on Saturday morning.
  • Highs in the 50s on Saturday, and low to mid 60s on Sunday.
  • Lows in the 40s.
Next Week
  • Mostly dry on Monday. A chance of rain at times starting on Tuesday.
  • Highs in the low to mid 60s early, and then cooler.
  • Lows in the mid 30s to mid 40s on Monday morning, and then warmer, and possibly cooler later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the upper 50s to low 60s and lows in the mid 30s to around 40.
Weekend
  • Rain likely on Saturday, and a chance of showers on Sunday.
  • Highs in the 50s on Saturday, and 50s to around 60 on Sunday.
  • Lows in the 40s.
Next Week
  • Mostly dry on Monday. A chance of rain at times starting later on Tuesday.
  • Highs in the mid 50s to mid 60s early, and then cooler.
  • Lows in the mid 30s to low 40s on Monday morning, and then warmer, and possibly cooler later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid 50s to low 60s and lows in the upper 30s to low 40s.
Weekend
  • Rain on Saturday, and showers likely on Sunday.
  • Highs in the mid 50s to low 60s on Saturday, and 50s to around 60 on Sunday.
  • Lows in the mid 40s to mid 50s on Saturday morning, and mid to upper 40s on Sunday morning.
Next Week
  • Mostly dry on Monday. Rain likely at times starting on Monday night or Tuesday.
  • Highs in the upper 50s to 60s early, and then cooler.
  • Lows in the upper 30s to 40s on Monday morning, and then warmer, and possibly cooler later in the week.

Washington State University