AgWeatherNet Weekly Weather Outlook for Apr 3 to Apr 9, 2020

A chilly and unsettled weekend followed by a warmer and pleasant week

Craig Oswald, Field Meteorologist, 509-786-9256
Joe Zagrodnik, Postdoctoral Research Associate

Discussion:

Weather conditions this outlook period are expected to vary quite a bit between the weekend and the upcoming week. The weekend looks to be defined by cooler than normal temperatures and unsettled weather with scattered lowland rain and upland/mountain snow showers, or at least the chance for a few passing scattered showers, through the state. As we move into next week, it appears that the Pacific Northwest will be located on the ridge side of a split flow regime as a cut-off low stubbornly takes up residence along the California coast. The benefits of being under the ridge include warmer than normal temperatures and pleasant weather for outdoor work. These conditions look to remain through the end of the week.

More specifically, breezy conditions and the chance for precipitation look to subside through the overnight tonight (Friday) with winds becoming light and skies partly cloudy. Another chilly night looks to be in store with some of the coldest regions dipping below the general temperature forecast indicated in the regional breakdown below. These highly localized spots that typically trend colder during nights with light to calm winds and mostly clear skies can expect temps in the lower 20s, with a few liable to hit the upper teens, making mitigation due to radiative inversion likely necessary depending on the type of crop and its bud/blossom stage.

Conditions during the day Saturday are expected to remain dry, however, Saturday evening looks to see the return of rain showers from the southwest. A modest surface disturbance is anticipated to move into northern California/southern Oregon from the west/northwest in conjunction with a deepening trough that looks to sweep into the western U.S. from the northwest. Additionally, this trough looks to be split by a robust jet stream located across the north Pacific and into Canada, creating the cut-off low referenced earlier. Saturday nights disturbance looks to be slightly warmer with snow levels raising to around 2500 feet during the overnight from the roughly 1500 feet that they have been during the recent overnights. Conditions look to slowly trend drier during the day Sunday but remain generally unsettled. Mostly scattered rain showers and upland/mountain snow showers can be expected to remain through the state for Sunday night with snow levels to mostly reside around 3000 feet. With slightly warmer temperatures moving in with the unsettled weather, temperatures are not expected to drop as low as Friday night and cold weather mitigation will likely not be needed for most.

Conditions look to trend dry and warmer through the day Monday as the ridge builds into the Pacific Northwest from the west. Mostly clear skies, light winds and warmer temperatures look to remain through the end of the week. With that being said, overnight cold weather mitigation will likely not be necessary during the week either due to the warmer temperatures. However, light winds and mostly clear skies can again lend to strong overnight radiative inversion, potentially dropping some surface temps in areas prone to cold pooling into the upper 20s. This will be reexamined in Mondays outlook update.

Of note, Yakima recorded a record low temperature for April 3rd with 19°F recorded at the airport this morning.


8 to 14 Day Outlook - Apr 10, 2020 to Apr 16, 2020
  • Slightly cooler than average temperatures and near average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week's Weather

South Central Washington
Weekend
  • Wind: Breezy SW winds Friday with gusts around 35mph. Becoming calmer Friday night and shifting E/SE. Remaining generally E/SE yet variable and light through the weekend.
  • Precipitation: Dry conditions expected Friday and Saturday. Widespread rain showers to move in from the S/SW Saturday night. Trending dry Sunday with the chance for a stray shower or two. More consistent rain showers moving back in form the S/SW Sunday evening.
  • High Temps: Mid 50s Friday, low 50s Saturday, mid 50s Sunday.
  • Low Temps: Mid 20s Friday night, mid 30s Saturday night, mid 30s Sunday night.
  • Sky Cover: Mostly sunny Friday, partly cloudy Friday night, partly sunny Saturday, cloudy Saturday night, cloudy Sunday, mostly cloudy Sunday night.
Next Week
  • Wind: Light and variable.
  • Precipitation: Rain showers gradually trending dry through the day Monday. Dry conditions expected for the remainder of the week.
  • High Temps: Low 60s Monday, near 70 Tuesday, near 70 Wednesday, low 70s Thursday.
  • Low Temps: Mid 30s Monday night, upper 30s Tuesday night, near 40 Wednesday night, near 40 Thursday night.
  • Sky Cover: Sunny to partly cloudy.

North Central Washington
Weekend
  • Wind: Breezy SW winds Friday with gusts approaching 30mph through the Basin. Becoming calmer Friday night and shifting NW through northern parts of the region and generally SE through the Basin. Remaining generally NW and SE respectively yet variable and light through the weekend.
  • Precipitation: Chance for a few scattered upland snow showers Friday and Friday night. Little accumulation expected under any such activity. Dry conditions expected Saturday. Lowland rain and upland snow showers to move in from the south Saturday night. Light accumulations expected in upland areas. Trending dry Sunday with a stray shower or two lingering. More lowland rain and upland snow showers moving in Sunday night with higher snow levels and little to no accumulation.
  • High Temps: Upper 40s Friday, near 50 Saturday, near 50 Sunday. Cooler through higher terrain.
  • Low Temps: Mid 20s Friday night, low 30s Saturday night, low 30s Sunday night. Cooler through higher terrain.
  • Sky Cover: Mostly sunny Friday, partly cloudy Friday night, mostly cloudy Saturday, mostly cloudy Saturday night, mostly cloudy Sunday, mostly cloudy Sunday night.
Next Week
  • Wind: Light and variable
  • Precipitation: Lowland rain and upland snow showers gradually trending dry through the day Monday. Dry conditions expected for the remainder of the week.
  • High Temps: Mid 50s Monday, low 60s Tuesday, low 60s Wednesday, mid 60s Thursday. Cooler through higher terrain.
  • Low Temps: Mid 30s Monday night, mid 30s Tuesday night, upper 30s Wednesday night, upper 30s Thursday night. Cooler through higher terrain.
  • Sky Cover: Mostly sunny to partly cloudy.

Eastern Washington
Weekend
  • Wind: Light and variable.
  • Precipitation: Chance for a few scattered rain and snow showers Friday and Friday night. Little to no accumulation expected under any such activity. Dry conditions expected Saturday. Lowland rain and upland snow showers to move in from the SW Saturday night. Light accumulations expected in upland areas. Trending dry Sunday with a few stray rain showers expected to linger, primarily along the Idaho border. More rain showers moving in Sunday night.
  • High Temps: Mid 40s Friday, near 50 Saturday, low 50s Sunday.
  • Low Temps: Mid 20s Friday night, low 30s Saturday night, mid 30s Sunday night.
  • Sky Cover: Mostly sunny Friday, mostly cloudy Friday night, partly sunny Saturday, mostly cloudy Saturday night, cloudy Sunday, mostly cloudy Sunday night.
Next Week
  • Wind: Light and variable.
  • Precipitation: Rain showers gradually trending dry through the day Monday. Dry conditions expected for the remainder of the week.
  • High Temps: Near 50 Monday, mid 50s Tuesday, upper 50s Wednesday, low 60s Thursday.
  • Low Temps: Mid 30s Monday night, mid 30s Tuesday night, mid 30s Wednesday night, upper 30s Thursday night.
  • Sky Cover: Mostly sunny to partly cloudy.

Western Washington
Weekend
  • Wind: Generally light W/SW winds becoming breezy at times Friday. Becoming calmer and variable Friday night and remaining so for the weekend.
  • Precipitation: Scattered rain showers and mountain snow showers to continue. Briefly trending dry Saturday before scattered rain and mountain snow showers begin moving in from the south Saturday night and linger through Sunday. Greater shower activity to the south expected Sunday. A few inches of accumulation likely at pass levels through Saturday night.
  • High Temps: Upper 40s Friday, low 50s Saturday, mid 50s Sunday. Much cooler through the Cascades and Olympics.
  • Low Temps: Near 30 Friday night, mid 30s Saturday night, mid 30s Sunday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Partly sunny Friday, mostly cloudy Friday night, mostly cloudy Saturday, mostly cloudy Saturday night, mostly cloudy Sunday, mostly cloudy Sunday night.
Next Week
  • Wind: Light and variable. A bit breezier at times near Puget Sound and the coast.
  • Precipitation: Rain showers and mountain snow showers gradually trending dry through the day Monday. Dry conditions expected for the remainder of the week.
  • High Temps: Upper 50s Monday, low 60s Tuesday, low 60s Wednesday, low 60s Thursday. Much cooler through the Cascades and Olympics.
  • Low Temps: Mid 30s Monday night, mid 30s Tuesday night, upper 30s Wednesday night, upper 30s Thursday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Mostly sunny to partly cloudy.

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