AgWeatherNet Weekly Weather Outlook for April 21 to April 27, 2018

Western Showers and Widespread Wind on Saturday; Summer Prelude Next Week

Nic Loyd, Meteorologist, 509-786-9357

A storm system clipping the northern part of the state tonight and Saturday will bring some western rain through early Saturday morning, and also a chance of showers to parts of northern Washington. Slight cooling and breezy to windy conditions are expected for Saturday, as the disturbance exits the region.

Isolated frost concerns should return for Sunday and Monday mornings due to the presence of fairly dry air. However, as a ridge of high pressure builds across the Northwest, the main trend is likely to be toward warmer, drier, and calmer conditions into early next week. It is possible that widespread 70s could arrive by about Tuesday, and then some 80s are anticipated for later in the week.

Morning low temperatures look to continue to warm through the period, while daytime highs in the west are predicted to decrease by week's end. The forecast for later in the period is less certain, but late spring-like weather may persist. The main question is what happens to a meandering, cut off low pressure area that could slowly approach Washington by next Friday. That system might eventually usher in slight daytime cooling, increased moisture levels, and elevated breezes, though its evolution is unclear.

In any case, the warmest weather of year is on the way next week. There is no sign of any cool weather similar to recent conditions on the horizon, but it does appear that this early season warm spell is set to end next weekend.


Key Points:

  • A chance of lingering rain on Saturday morning for western Washington
  • Windy on Saturday, especially east of the Cascades, with possible blowing dust
  • Isolated frost possible on Sunday and Monday mornings, with stronger inversions in cold areas by Monday morning
  • Becoming much warmer, drier, and calmer next week, with increasing high elevation snowmelt
  • Increasing irrigation demand next week

Potential Peak Temperatures for Next Week: Estimated Values and Timing by Region

  • Coast: 70s to low 80s; Mid Week
  • Interior Western WA: 70s to low 80s; Mid to Late Next Week
  • South Central WA: 80s; Late Next Week
  • North Central WA: Low to mid 80s; Friday
  • Eastern WA: 70s to low 80s; Friday or Saturday


Temperatures
  • Becoming notably warmer next week.
  • Cooler lows on Sunday and Monday mornings, and then becoming warmer at night.
  • Warming highs for next week, except cooler in the west late in the week.

Precipitation
  • Western rain possible on Saturday morning, and a chance of northern showers, otherwise mainly dry.
  • A slight chance of rain by next Friday night.

Wind
  • Breezy to windy southwesterly winds on Saturday.
  • Possibly breezy northeasterly winds around Monday.

8 to 14 Day Outlook - April 28, 2018 to May 4, 2018
  • Overall, above average temperatures and below 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 upper 60s to around 70 and lows in the upper 30s to mid 40s.
Weekend
  • Mostly dry. Breezy to windy on Saturday.
  • Highs in the 60s.
  • Lows in the upper 30s to 40s on Saturday morning, and 30s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the low to mid 70s on Monday, and then becoming warmer.
  • Lows in the 30s on Monday morning, and then becoming warmer.

North Central Washington
  • Normal conditions for this time of the year would be highs in the mid to upper 60s and lows in the upper 30s to mid 40s.
Weekend
  • Mostly dry. A slight chance of mountain showers on Saturday morning.
  • Highs in the low to mid 60s.
  • Lows in the low to mid 40s on Saturday morning, and 30s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the low 70s on Monday, and then becoming warmer.
  • Lows in the 30s to low 40s on Monday morning, and then becoming warmer.

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 low 40s.
Weekend
  • Mostly dry. Breezy to windy on Saturday.
  • A slight chance of showers on Saturday morning in the north.
  • Highs in the mid 50s to low 60s on Saturday, and mid 50s to mid 60s on Sunday.
  • Lows in the low to mid 40s on Saturday morning, and upper 20s to 30s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 60s to around 70 on Monday, and then becoming warmer.
  • Lows in the 30s on Monday morning, and then becoming warmer.

Western Washington
  • Normal conditions for this time of the year would be highs in the upper 50s to low 60s and lows in the upper 30s to 40s.
Weekend
  • A chance of rain on Saturday morning, and then mostly dry.
  • Highs in the mid to upper 50s on Saturday, and upper 50s to 60s on Sunday.
  • Lows in the low to mid 40s on Saturday morning, and mid 30s to low 40s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 60s to mid 70s on Monday, and then warmer, and cooler later in the week.
  • Lows in the 30s to mid 40s on Monday morning, and then becoming warmer.

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