AgWeatherNet Weekly Weather Outlook Monday Update for June 8 to June 14, 2020

A continued unsettled pattern with T-storm potential by weeks end

Craig Oswald, Field Meteorologist, 509-786-9256

Discussion:

A round of rain showers still looks to be on tap for Tuesday. These showers are associated with a passing frontal boundary from the west. A few pre frontal showers look to begin moving into western Washington from the west/southwest Monday night with most of the showers not anticipated until Tuesday morning. Moist southwest flow in conjunction with the passing front will aid in producing widespread light to moderate rain showers throughout western Washington and the Cascades. The Basin and south central Washington look to see mostly light and scattered rain showers throughout the region with more activity through upland and mountain areas such as those through northern Washington and the Blue Mountains in the southeast corner of the state. Far eastern Washington is also expected to see more consistent light rain showers. Conditions look to trend drier Wednesday and into Thursday as a ridge passes west to east through the Pacific Northwest. High elevation areas throughout the state, as well as greater western Washington, are likely to cling to a few scattered rain showers however.

Beyond Thursday and through the weekend, conditions look to once again become unsettled as an upper trough is expected to take residence along the west coast. Washington will generally be under a southwest flow with an uptick in scattered rain showers anticipated statewide. Scattered showers are to begin passing through the state Thursday night and continue through the weekend. Western Washington is likely to see more widespread shower activity beginning Saturday night and continuing through Sunday. With a somewhat unstable atmosphere, and a general synoptic pattern conducive for ascending air, an isolated modest thunderstorm or two is possible through parts of Washington. The greatest chance for any such activity is expected to be found around far southeast parts of the state and the Palouse. A thunderstorm or two also has a chance to initialize over the Cascades as well. The time frame for any thunderstorms looks to be Thursday night as rain showers initially begin moving into the state, as well as Friday and Saturday, primarily in the late afternoon and early parts of the overnight.

Cooler than average temperatures look to become warmer by mid week with near average highs expected again by Wednesday and Thursday (thanks to the passing frontal boundary Tuesday and brief residence under a ridge Wednesday and into Thursday as mentioned earlier). Temperatures Friday and for the weekend look to again slip just below average thanks to the expectant trough.

Temperatures last night (Sunday night) reached exceptionally cold for this time of year. Temperatures in the upper and mid 30s were observed through multiple locations in the northern Basin, valleys of northern Washington, Horse Heaven Hills, and most particularly the upper Yakima valley. A general lack of cloud cover east of the Cascades is the likely culprit that allowed overnight temperatures to drop a few degrees cooler than anticipated in Fridays Outlook. Air aloft looks to be slightly warmer tonight (Monday), but will remain cooler than seasonable. Winds are expected to trend lighter through Monday night with low to mid clouds likely to move into south central parts of the state during the overnight (thanks in part to moist southwest flow and approaching front). However, due to the southwest nature of the flow, mountain waves in lee of the Cascades may produce areas of clearer skies. It is definitely possible that some of the areas mentioned earlier who trended cold last night, such as the upper Yakima Valley, parts of the Okanogan, and northern Basin, will again be cool tonight. Although, temperatures are expected to trend a few degrees warmer than last night in these locations with generally near 40 expected and a potential for 36-37.


Important Points about Next Week's Weather

South Central Washington
Remainder of the Week
  • Wind: Breezy and windy conditions trending lighter through Monday night. Breezy S/SW winds at times Tuesday followed by generally light S/SW winds through the week. Becoming a bit more variable by weeks end. Gusty conditions expected under any thunderstorm activity.
  • Precipitation: Scattered light rain showers from the SW Tuesday. Trending dry Tuesday night and remaining so Wednesday and Thursday. More scattered and less consistent rain showers to move in from the SW Thursday night and linger through the end of the week. An isolated thunderstorm or two possible Thursday night and Friday.
  • High Temps: Upper 60s Tue, low 80s Wed, low 80s Thu, upper 70s Fri.
  • Low Temps: Upper 40s Mon night, upper 40s Tue night, mid 50s Wed night, mid 50s Thu night.
  • Sky Cover: Mostly cloudy Mon night, cloudy Tue, partly cloudy Tue night, mostly sunny Wed, partly cloudy Wed night, mostly cloudy Thu, mostly cloudy Thu night, mostly cloudy Fri.

Weekend
  • Wind: S/SW winds remaining light and variable. Becoming windy by Saturday afternoon. Winds remaining elevated Sunday.
  • Precipitation: Continued chance for a rain shower or two through the weekend. Low chance for a stray thunderstorm Saturday.
  • High Temps: Near 70 Sat, low 70s Sun.
  • Low Temps: Low 50s Fri night, upper 40s Sat night, near 50 Sun night.
  • Sky Cover: Mostly sunny to mostly cloudy.

North Central Washington
Remainder of the Week
  • Wind: Breezy and windy conditions trending lighter through Monday night. Breezy S/SW winds at times Tuesday followed by generally light S/SW winds through the week. Becoming a bit more variable by weeks end. Gusty conditions expected under any thunderstorm activity.
  • Precipitation: Scattered rain showers to move in from the W/SW Tuesday. Trending dry Tuesday night and remaining so for Wednesday and Thursday aside from a few light rain showers to linger over high terrain. More scattered rain showers to move in form the SW Thursday night and linger through the end of the week. More consistent shower activity through high terrain, less through the Basin. An isolated thunderstorm or two possible Thursday night and Friday.
  • High Temps: Low 60s Tue, mid 70s Wed, upper 70s Thu, mid 70s Fri. Cooler in high terrain.
  • Low Temps: Mid 40s Mon night, near 50 Tue night, mid 50s Wed night, mid 50s Thu night. Cooler in high terrain and deep valleys.
  • Sky Cover: Mostly clear Mon night, cloudy Tue, mostly cloudy Tue night, partly sunny Wed, mostly cloudy Wed night, mostly cloudy Thu, mostly cloudy Thu night, mostly cloudy Fri.

Weekend
  • Wind: S/SW winds remaining light and variable. Becoming breezier by Saturday afternoon and windy through the Basin. Winds remaining elevated Sunday.
  • Precipitation: Continued scattered rain showers through the weekend. Lower chance of showers through the Basin. Low chance for a stray thunderstorm Saturday.
  • High Temps: Upper 60s Sat, low 70s Sun. Cooler in high terrain.
  • Low Temps: Low 50s Fri night, upper 40s Sat night, upper 40s Sun night. Cooler in high terrain and deep valleys.
  • Sky Cover: Mostly sunny to mostly cloudy.

Eastern Washington
Remainder of the Week
  • Wind: Breezy and windy conditions trending lighter through Monday night. Breezy S/SW winds at times Tuesday followed by generally light S/SW winds through the week. Becoming a bit more variable by weeks end. Gusty conditions expected under any thunderstorm activity.
  • Precipitation: Scattered rain showers from the SW Tuesday. Trending dry Tuesday night and remaining so Wednesday and Thursday with a shower or two likely to linger over the Blue Mtns. More rain showers to move in from the SW Thursday night and linger through the end of the week. A few scattered thunderstorm possible Thursday night and Friday.
  • High Temps: Mid 50s Tue, low 70s Wed, mid 70s Thu, low 70s Fri.
  • Low Temps: Low 40s Mon night, mid 40s Tue night, low 50s Wed night, low 50s Thu night.
  • Sky Cover: Partly cloudy Mon night, cloudy Tue, mostly cloudy Tue night, mostly sunny Wed, partly cloudy Wed night, partly sunny Thu, mostly cloudy Thu night, mostly cloudy Fri.

Weekend
  • Wind: S/SW winds remaining light and variable. Becoming windy by Saturday afternoon. Winds remaining elevated Sunday.
  • Precipitation: Scattered rain showers becoming more widespread and consistent Saturday with a stray thunderstorm possible. Rain showers trending back to scattered for Sunday.
  • High Temps: Low 60s Sat, low 60s Sun.
  • Low Temps: Mid 40s Fri night, mid 40s Sat night, mid 40s Sun night.
  • Sky Cover: Partly sunny to mostly cloudy.

Western Washington
Remainder of the Week
  • Wind: Breezy conditions remaining through Monday night and Tuesday, particularly near the coast and sound. Winds becoming generally light and W/SW Wednesday and remaining so through the week. However, a bit more variable by weeks end. Gusty conditions expected under any thunderstorm activity.
  • Precipitation: Rain showers begin moving in from the west Monday night. Widespread rain and rain showers Tuesday. Trending mostly dry Tuesday night with a few stray rain showers lingering through the region Wednesday and Thursday. Shower activity remaining more consistent through the Olympics and Cascades. Scattered rain showers again increasing Thursday night and remaining through Friday. A stray thunderstorm possible over the Cascades Thursday night and Friday.
  • High Temps: Low 60s Tue, upper 60s Wed, near 70 Thu, mid 60s Fri. Much cooler through the Cascades and Olympics.
  • Low Temps: Upper 40s Mon night, near 50 Tue night, low 50s Wed night, low 50s Thu night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Cloudy Mon night, cloudy Tue, cloudy Tue night, mostly cloudy Wed, mostly cloudy Wed night, mostly cloudy Thu, mostly cloudy Thu night, mostly cloudy Fri.

Weekend
  • Wind: W/SW winds remaining light and variable. Becoming breezier in general and windy near the coast and sound by Saturday afternoon with winds shifting S region wide. Winds remaining elevated Sunday.
  • Precipitation: Scattered rain showers remaining through the region with greater activity in high elevation. More widespread rain returns Sunday.
  • High Temps: Low 60s Sat, mid 60s Sun.
  • Low Temps: Upper 40s Fri night, mid 40s Sat night, upper 40s Sun night. Much cooler through the Cascades and Olympics.
  • Sky Cover: Mostly cloudy.

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