AgWeatherNet Weekly Weather Outlook Monday Update for Mar 30 to Apr 5, 2020

More consistent model agreement indicating a cool week

Craig Oswald, Field Meteorologist, 509-786-9256

Discussion:

The cold front that passed through Washington state earlier today looks to return us to cooler than normal temperatures for this time of year. With weather models now also mostly in agreement, it can be determined that these cooler temperatures are expected to linger through the week and into the first part of the weekend before gradually returning to near normal as we move into the following week. The passage of the cold front appears to be in conjunction with a disturbance situated offshore from British Columbia. The passing upper trough associated with the offshore disturbance looks to be responsible for this weeks cooler, and generally unsettled, weather. Mostly cloudy conditions and scattered precipitation are anticipated statewide through the week with inland and south-central Washington looking to stay a little drier than most, as is usually the case with these kind of northwest to southeast moving disturbances. Due to the cold temperatures aloft, graupel also looks to also be a valid precipitation type along with lowland rain and upland snow showers through the week. Graupel can be expected in some of the stronger scattered showers.

As scattered precipitation slowly tapers off through Friday, a short-lived dry day on Saturday is anticipated. However, the next disturbance looks to impact northern California Sunday with more scattered showers working their way into Washington from the southwest. Temperatures look to hold close to normal or slightly cooler than normal for the weekend.

This is expected to be another week in which cold weather damage mitigation techniques will be needed for certain tree fruits through the state. As stated Friday, the mostly cloudy skies that look to prevail through the week will help to keep strong surface inversions at bay. But with winds trending lighter early in the week, count on at least some weak inversion formation in certain locales due to lack of boundary layer mixing. Cold air pooling in low lying areas can subsequently be expected with some temps dropping into the low 20s in very localized areas.


Important Points about Next Week's Weather

South Central Washington
Remainder of the Week
  • Wind: Windy conditions to become lighter through the overnight. Some gusts into the mid 20 mph range through Tuesday night likely with lighter S/SW winds remaining until Thursday. S/SW winds to again increase Friday.
  • Precipitation: A few light scattered rain showers expected to move through the region from the W/NW. Upland snow possible during the overnights with little accumulation expected under any such activity.
  • High Temps: Mid 50s Tuesday, low 50s Wednesday, mid 50s Thursday, mid 50s Friday.
  • Low Temps: Mid 30s Monday night, low 30s Tuesday night, upper 20s Wednesday night, near 30 Thursday night.
  • Sky Cover: Partly cloudy Monday night, partly sunny Tuesday, mostly cloudy Tuesday night, partly sunny Wednesday, mostly cloudy Wednesday night, mostly sunny Thursday, mostly cloudy Thursday night, mostly cloudy Friday.

Weekend
  • Wind: S/SW winds to become a bit lighter through Friday night, but remain breezy at times and variable through the weekend.
  • Precipitation: Trending dry Saturday. Scattered rain showers to start moving back in from the SW Sunday.
  • High Temps: Upper 50s Saturday, low 60s Sunday.
  • Low Temps: Low 30s Friday night, mid 30s Saturday night, mid 30s Sunday night.
  • Sky Cover: Mostly sunny to mostly cloudy.

North Central Washington
Remainder of the Week
  • Wind: Breezy conditions to become lighter through the overnight. Winds to become roughly N/NW Tuesday and remain light. Winds again shifting S/SW Thursday and growing breezier through Friday.
  • Precipitation: Scattered rain and snow showers to move through the region from the west. Little accumulation expected under any such activity.
  • High Temps: Low 50s Tuesday, upper 40s Wednesday, upper 40s Thursday, upper 40s Friday. Cooler in higher terrain.
  • Low Temps: Low 30s Monday night, near 30 Tuesday night, mid 20s Wednesday night, near 30 Thursday night. Cooler in higher terrain.
  • Sky Cover: Partly cloudy Monday night, partly sunny Tuesday, mostly cloudy Tuesday night, partly sunny Wednesday, mostly cloudy Wednesday night, partly sunny Thursday, mostly cloudy Thursday night, partly sunny Friday.

Weekend
  • Wind: S/SW winds to become a bit lighter Friday night. Remining fairly light and becoming variable through the weekend. A bit breezier at times through the northern part of the Basin/Palouse.
  • Precipitation: Trending dry Saturday. Scattered rain and upland snow showers to start moving back in from the south Sunday.
  • High Temps: Low 50s Saturday, mid 50s Sunday. Cooler in higher terrain.
  • Low Temps: Upper 20s Friday night, low 30s Saturday night, low 30s Sunday night. Cooler in higher terrain.
  • Sky Cover: Mostly sunny to mostly cloudy.

Eastern Washington
Remainder of the Week
  • Wind: Windy conditions to become lighter through the overnight. Some gusts into the mid 20 mph range through Tuesday night likely. Lighter S/SW winds to turn S/SE Wednesday. Winds to again increase Friday.
  • Precipitation: Scattered rain and snow showers to move through the region from the west. Little accumulation expected under any such activity.
  • High Temps: Mid 40s Tuesday, low 40s Wednesday, low 40s Thursday, mid 40s Friday.
  • Low Temps: Low 30s Monday night, near 30 Tuesday night, upper 20s Wednesday night, upper 20s Thursday night.
  • Sky Cover: Mostly cloudy Monday night, mostly cloudy Tuesday, mostly cloudy Tuesday night, mostly cloudy Wednesday, mostly cloudy Wednesday night, mostly cloudy Thursday, mostly cloudy Thursday night, mostly cloudy Friday.

Weekend
  • Wind: S/SW winds to become a bit lighter through Friday night, but remain breezy at times and variable through the weekend.
  • Precipitation: Trending dry Saturday. Scattered rain and a few snow showers to start moving back in from the SW Sunday.
  • High Temps: Upper 40s Saturday, near 50 Sunday.
  • Low Temps: Upper 20s Friday night, low 30s Saturday night, mid 30s Sunday night.
  • Sky Cover: Mostly cloudy

Western Washington
Remainder of the Week
  • Wind: Breezy conditions to become lighter through the overnight. Winds to become more NW Wednesday and remain light. Winds again shifting S/SW Thursday.
  • Precipitation: Light to moderate rain showers, mostly scattered in nature with the potential to become heavy at times, expected. More consistent light to moderate mountain snow showers expected with accumulations of several inches at pass levels early in the week.
  • High Temps: Upper 40s Tuesday, low 50s Wednesday, near 50 Thursday, low 50s Friday. Much cooler through the Cascades and Olympics.
  • Low Temps: Mid 30s Monday night, mid 30s Tuesday night, low 30s Wednesday night, low 30s Thursday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Mostly cloudy Monday night, mostly cloudy Tuesday, mostly cloudy Tuesday night, partly sunny Wednesday, mostly cloudy Wednesday night, mostly cloudy Thursday, cloudy Thursday night, partly sunny Friday.

Weekend
  • Wind: Light and variable. A bit breezy at times through Puget Sound and along the coast.
  • Precipitation: Trending dry Saturday. Scattered rain and mountain snow showers to start moving back in from the S/SW Saturday night.
  • High Temps: Low 50s Saturday, mid 50s Sunday. Much cooler through the Cascades and Olympics.
  • Low Temps: Low 30s Friday night, mid 30s Saturday night, mid 30s Sunday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Partly sunny to mostly cloudy.

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