AgWeatherNet Weekly Weather Outlook Monday Update for May 11 to May 17, 2020

Persistent low off the coast to bring unsettled conditions through most of the week

Mark Ingalls, AgWeatherNet Intern
Craig Oswald, Field Meteorologist, 509-786-9256

Discussion:

A low-pressure system will slowly meander from south to north off the Oregon and Washington coast through Thursday. This will cycle consistent moisture into the state from the south, bringing frequent rain showers west of the Cascades. Rain showers are also expected to the east of the Cascades during the period, though these will be fewer in number. Throughout the state, some of these showers could produce some thunder and lightning.

Rainfall values in the drought-stricken areas of Central Washington are not expected to completely resolve the abnormally dry conditions there. Rainfall values through Thursday in the driest areas (Omak, Wenatchee, Yakima, the Tri-Cities, etc.) should remain below a half an inch. The severe drought area around Vancouver looks to see modest improvement, with that area standing to gain between half an inch to an inch. Some storms may produce decent downpours. Storms like this are not expected to be widespread, but those who do get one can expect to end the week with higher rainfall values. Snow will be limited to the High Cascades, Olympics, and the highest parts of the Okanogan.

The moisture brought into the region by the low will be accompanied with ample cloud cover statewide. This will help to moderate temperatures both during the day and overnight. Freezing and near-freezing temperatures are not expected in any lowland location through the week. Breezy conditions with gusts peaking around 30 mph and flow from the southwest can be expected in the Columbia Basin through Wednesday. A stiff breeze is also expected throughout the state Thursday, with the windiest areas being in the usual spots, such as the Columbia Gorge and Kittitas Valley. In these areas, winds may gust to 30 mph.

Beyond Thursday, a brief drying trend is expected as a weak upper-level ridge looks to move across the Pacific Northwest Friday and Saturday. This should also bring warmer daytime temperatures to the region Friday and Saturday. Despite clearer skies, overnight temperatures should remain above freezing in the lowlands. However, another shot at what currently looks to be widespread precipitation is expected to start moving into the state from the west on Saturday and linger through Sunday. We will touch more on this in our Friday outlook.


Important Points about Next Week's Weather

South Central Washington
Remainder of the Week
  • Wind: Variable and light to calm winds Tuesday. SW winds increasing Tuesday night. Windy Wednesday with winds turning W and gusts 40+ mph possible. Trending back to light and variable Wednesday night with a few breezy periods through the end of the week.
  • Precipitation: Rain showers along with a possible T-storm to move in from the SW Tuesday night. Trending dry Wednesday afternoon and remaining so for the week.
  • High Temps: Upper 70s Tuesday, upper 60s Wednesday, low 70s Thursday, near 80 Friday.
  • Low Temps: Mid 40s Monday night, low 50s Tuesday night, mid 30s Wednesday night, low 40s Thursday night.
  • Sky Cover: Partly cloudy Monday night, mostly sunny Tuesday, mostly cloudy Tuesday night, mostly sunny Wednesday, clear Wednesday night, sunny Thursday, clear Thursday night, sunny Friday.

Weekend
  • Wind: Turning generally NE Friday night and becoming breezy during the daytime hours before trending lighter during the overnights. Gusts around 30mph possible.
  • Precipitation: Rain showers moving in from the W Saturday night, trending dry Sunday night.
  • High Temps: Mid 80s Saturday, mid 80s Sunday.
  • Low Temps: Upper 40s Friday night, low 50s Saturday night, low 50s Sunday night.
  • Sky Cover: Sunny to mostly clear.

North Central Washington
Remainder of the Week
  • Wind: Variable and light to calm winds Tuesday. W winds increasing Tuesday night. Windy Wednesday with gusts 40+ mph possible, particularly through the Basin. Trending back to light and variable Wednesday night with a few breezy periods through the end of the week.
  • Precipitation: Rain showers along with a possible T-storm to move in from the S/SW Tuesday night. Mountain snow showers likely with snow levels near 6000ft. Trending dry Wednesday night and remaining so for the week.
  • High Temps: Low 70s Tuesday, low 60s Wednesday, near 70 Thursday, mid 70s Friday. Cooler through higher terrain.
  • Low Temps: Low 40s Monday night, mid 40s Tuesday night, upper 30s Wednesday night, low 40s Thursday night. Cooler through higher terrain.
  • Sky Cover: Partly cloudy Monday night, mostly sunny Tuesday, mostly cloudy Tuesday night, mostly cloudy Wednesday, partly cloudy Wednesday night, sunny Thursday, mostly clear Thursday night, sunny Friday.

Weekend
  • Wind: Turning generally E/NE Friday night and becoming breezy during the daytime hours before trending lighter during the overnights. Gusts around 30mph possible through the Basin.
  • Precipitation: Rain showers moving in from the W Saturday night, trending dry Sunday night.
  • High Temps: Upper 70s Saturday, upper 70s Sunday. Cooler through high terrain.
  • Low Temps: Mid 40s Friday night, upper 40s Saturday night, upper 40s Sunday night. Cooler through high terrain.
  • Sky Cover: Sunny to partly cloudy.

Eastern Washington
Remainder of the Week
  • Wind: Variable and light to calm winds Tuesday. SW winds increasing Tuesday night. Windy Wednesday with winds turning W and gusts 40+ mph possible. Trending back to light and variable Wednesday night with a few breezy periods through the end of the week.
  • Precipitation: Widespread rain showers along with a possible T-storm to move in from the SW Tuesday night. Trending dry Wednesday evening and remaining so for the week.
  • High Temps: Upper 60s Tuesday, mid 50s Wednesday, low 60s Thursday, near 70 Friday.
  • Low Temps: Low 40s Monday night, mid 40s Tuesday night, mid 30s Wednesday night, upper 30s Thursday night.
  • Sky Cover: Mostly clear Monday night, mostly sunny Tuesday, partly cloudy Tuesday night, cloudy Wednesday, partly cloudy Wednesday night, sunny Thursday, clear Thursday night, sunny Friday.

Weekend
  • Wind: Turning generally NE Friday night and becoming breezy during the daytime hours before trending lighter during the overnights. Gusts around 30mph possible.
  • Precipitation: Rain showers moving in from the W Sunday, trending dry Sunday night.
  • High Temps: Low 70s Saturday, mid 70s Sunday.
  • Low Temps: Low 40s Friday night, mid 40s Saturday night, upper 40s Sunday night.
  • Sky Cover: Sunny to mostly clear.

Western Washington
Remainder of the Week
  • Wind: Generally S/SW and light to breezy at times. Shifting W and variable Thursday and becoming calm to light.
  • Precipitation: Light to moderate rain showers to remain on and off through most of the week with a thunderstorm or two possible Tuesday. Trending dry Thursday night and Friday.
  • High Temps: Mid 60s Tuesday, low 60s Wednesday, low 60s Thursday, upper 60s Friday. Much cooler through the Cascades and Olympics.
  • Low Temps: Mid 40s Monday night, mid 40s Tuesday night, mid 40s Wednesday night, low 40s Thursday night. Much cooler through the Cascades and Olympics.
  • 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, partly sunny Friday. Patchy fog likely during the overnight through the week.

Weekend
  • Wind: Becoming breezy and remaining generally W Saturday. Light to breezy on Sunday.
  • Precipitation: Rain showers moving in from the W Saturday, trending drier Sunday night yet the chance for some lingering scattered showers looks to remain.
  • High Temps: Upper 60s Saturday, low 60s Sunday. Much cooler through the Cascades and Olympics.
  • Low Temps: Mid 40s Friday night, upper 40s Saturday night, mid 40s Sunday night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Mostly cloudy.

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