AgWeatherNet Weekly Weather Outlook Monday Update for March 1 to March 7, 2021

Mild temperatures and dry conditions mid week

Mark Ingalls, AgWeatherNet Intern
Craig Oswald

Synopsis:

Warm temperatures and mostly dry conditions are to define the weather through most of the work week, making pleasant conditions for any spring outdoor work. The region is to be influenced by mostly west/southwesterly flow aloft. By Friday however, a Pacific system looks to begin moving rain showers and high mountain snow (above pass levels) into western Washington. Washington east of the Cascades will mostly remain dry Friday. The weekend looks to continue to bring generally light rain showers and mountain snow showers throughout western Washington with some other parts of the state experiencing low chances of lowland rain and mountain snow as well.

Discussion:

Todays (Monday) weather has been dry statewide as the region resides between a longwave trough to the west over the north Pacific and a ridge to the east centered over western Montana. This has provided dry southwest flow aloft and mostly clear to partly cloudy skies with some high clouds over portions of the state. By Monday night the longwave trough mentioned looks to split with a closed upper low moving south toward the American southwest and zonal (west to east) flow aloft over Washington. A weak shortwave disturbance embedded within this flow looks to pass along the Washington/British Columbia border Monday night. This will mostly increase cloud cover through the northern portions of the state and stir up a few light mountain snow showers along the northern Cascade crest with a few scattered lowland rain showers possible around the Puget Sound area.

Mid week is expected to be dry statewide as westerly/southwesterly flow aloft dominate. Dry weather, warmer temperatures, and generally light winds look to make most of the work week ideal for any outdoor activity.

By Thursday night a round of widespread rain showers and high mountain snow (snow levels generally above pass levels) look to begin moving into the state from the west. This round of activity looks to be thanks to a weakening Pacific system that is expected to move southeast from the Gulf of Alaska. Due to this, it seems unlikely that much, if any, showers will make it east across the Cascades. Showers look to be prevalent throughout western Washington with the only the east slopes of the Cascades and the western half of the northern Washington region standing much of a chance to receive precipitation. Showers look to trend drier by Saturday but some lingering scattered showers are possible to remain throughout western Washington and the Cascades.

It is expected that Saturday night will see another weak Pacific system move into the state from the west. Snow levels are to be lower with this system and snow is likely at pass levels. Light rain showers are again expected across western Washington with showers slowly trending dry throughout Sunday. East of the Cascades, a few lowland rain and mountain snow showers are possible over the northern mountains and valleys as well as the Blue Mountains in southeast Washington. The east slopes of the Cascades and Palouse may also see a rain shower or two. The Columbia Basin is expected to remain dry.


Important Points About Next Week’s Weather

South Central Washington
Remainder of the week
  • Wind: Mostly light and S yet variable.
  • Precipitation: A few light rain showers near the Cascades Fri. Otherwise dry conditions expected.
  • High Temps: Upper 50s Tue, mid 50s Wed, upper 50s Thu, low 60s Fri.
  • Low Temps: Low 30s Mon night, low 30s Tue night, low 30s Wed night, mid 30s Thu night.
  • Sky Cover: Mostly sunny to partly cloudy. Becoming mostly cloudy by Fri.
Weekend
  • Wind: Mostly light and S yet variable. Becoming SW and breezy Sun.
  • Precipitation: Light lowland rain showers and mountain snow near the Cascades Sat night and into Sun. Much lower chance for a stray shower elsewhere with mostly dry conditions expected.
  • High Temps: Upper 50s Sat, mid 50s Sun.
  • Low Temps: Mid 30s Fri night, mid 30s Sat night, low 30s Sun night.
  • Sky Cover: Mostly cloudy to partly cloudy.

North Central Washington
Remainder of the week
  • Wind: Mostly light and S yet variable.
  • Precipitation: Light mountain snow showers Mon night/into Tue along the Cascade crest. Light rain showers and mountain snow Fri for the western half of the region. Otherwise dry conditions expected elsewhere.
  • High Temps: Upper 40s Tue, upper 40s Wed, low 50s Thu, mid 50s Fri. Cooler in high terrain.
  • Low Temps: Low 30s Mon night, upper 20s Tue night, low 30s Wed night, mid 30s Thu night. Cooler in high terrain.
  • Sky Cover: Mostly sunny to partly cloudy. Becoming mostly cloudy by Fri.
Weekend
  • Wind: Mostly light and S yet variable. Becoming W/SW and breezy Sun, especially throughout the Basin.
  • Precipitation: Mountain snow and lowland light rain through/near the Cascades Sat night and into Sun. Otherwise dry conditions expected.
  • High Temps: Low 50s Sat, upper 40s Sun. Cooler in high terrain.
  • Low Temps: Mid 30s Fri night, mid 30s Sat night, low 30s Sun night. Cooler in high terrain.
  • Sky Cover: Mostly cloudy to partly cloudy.

Eastern Washington
Remainder of the week
  • Wind: Mostly S/SE and light to breezy. Breezier in and around the Blues.
  • Precipitation: Dry conditions expected.
  • High Temps: Mid 40s Tue, near 50 Wed, mid 50s Thu, mid 50s Fri. Cooler through the Blue Mtns.
  • Low Temps: Low 30s Mon night, low 30s Tue night, low 30s Wed night, mid 30s Thu night. Cooler through the Blue Mtns.
  • Sky Cover: Mostly sunny to partly cloudy.
Weekend
  • Wind: Mostly SE and light to breezy. Breezier in and around the Blues particularly. Turning SW Sun and breezy.
  • Precipitation: Chance for a light rain shower or two Sat night/into Sun. More consistent rain and mountain snow in and near the Blues. Otherwise dry conditions expected.
  • High Temps: Low 50s Sat, upper 40s Sun. Cooler through the Blue Mtns.
  • Low Temps: Mid 30s Fri night, mid 30s Sat night, low 30s Sun night. Cooler through the Blue Mtns.
  • Sky Cover: Mostly cloudy to partly cloudy.

Western Washington
Remainder of the week
  • Wind: Light and mostly S yet variable. Becoming breezier Thu and Fri with some strong gusts possible near the sound.
  • Precipitation: A few lowland rain showers near the sound and high mountain snow in the northern Cascades Mon night/Tue morning. Dry mid week. Widespread rain showers and high mountain snow beginning Thu night and remaining Fri.
  • High Temps: Upper 40s Tue, mid 50s Wed, upper 50s Thu, low 50s Fri. Cooler through the Cascade and Olympic Mtns.
  • Low Temps: Mid 30s Mon night, low 30s Tue night, mid 30s Wed night, low 40s Thu night. Cooler through the Cascade and Olympic Mtns.
  • Sky Cover: Mostly cloudy to mostly sunny.
Weekend
  • Wind: Light and mostly S yet variable. Turning SW Sat night and becoming breezy at times.
  • Precipitation: A few scattered showers Sat. Greater scattered lowland rain and mountain snow showers by Sat night and Sun.
  • High Temps: Low 50s Sat, near 50 Sun. Cooler through the Cascade and Olympic Mtns.
  • Low Temps: Near 40 Fri night, upper 30s Sat night, mid 30s Sun night. Cooler through the Cascade and Olympic Mtns.
  • Sky Cover: Mostly cloudy.

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Washington State University