AgWeatherNet Weekly Weather Outlook for March 24 to March 30, 2018

Cool with Frost Likely This Weekend; Warmer and Drier Next Week

Nic Loyd, Meteorologist, 509-786-9357

The presence of a low pressure trough on Saturday suggests that unsettled conditions and cool temperatures are likely. There will be clouds and some showers, particularly over the mountains, and also breezy conditions. For areas such as Pullman and Spokane, the showers could be in the form of snow.

Despite the unstable conditions, the air mass is cold enough that frost and subfreezing temperatures are a concern, especially east of the Cascades. There should be a wide range of values, but morning lows east of the Cascades have the potential to reach the upper teens in the coldest spots. Less clouds and wind means that colder readings are possible by Sunday morning, with more benign afternoon conditions compared to Saturday.

Starting around Monday, a high pressure ridge looks to begin to build across the region. As a result, appreciable warming is expected for next week, along with mainly dry conditions east of the Cascades. The one caveat is that lingering dry air and increasing stability may cause chilly and critical frost mornings to persist into early next week. The main question mark is exactly where the ridge sets up, and how strong it will be. There is some indication that it may be a “dirty ridge,” which means that some clouds and even light rain could impact western Washington into early next week. Breezes are also possible at times in central and eastern Washington.

In any case, several days of warm and uneventful weather is anticipated for the middle to latter part of next week, as high temperatures are forecast to surge into the 60s and perhaps even low 70s. By next weekend, a shift toward more active and slightly cooler conditions is set to occur, but the details are still unclear. Overall, following the initial frost concerns, a notable warm up is poised to happen next week.


Key Points:

  • Frost likely, particularly on Sunday and Monday mornings, and especially east of the Cascades
  • Widespread lows in the 20s to 30s, with upper teens to low 20s possible in the coldest spots
  • Night-time low level temperature inversions will generally be weaker on Saturday morning, with increasing inversion strength into early next week
  • Strong warming next week


Temperatures
  • Cool this weekend, and warmer for mid to late next week.

Precipitation
  • A chance of showers on Saturday, and a slight chance of rain at times next week in the west.

Wind
  • Breezy at times.

8 to 14 Day Outlook - March 31, 2018 to April 6, 2018
  • Overall, near 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
  • Normal conditions for this time of the year would be highs in the upper 50s to mid 60s and lows in the 30s.
Weekend
  • Mostly dry. A slight chance of showers on Saturday.
  • Highs in the 50s on Saturday, and 50s to around 60 on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and mid 20s to low 30s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 50s to low 60s on Monday, and then becoming warmer.
  • Lows in the mid 20s to mid 30s on Monday morning, and then becoming warmer.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 50s and lows in the low to mid 30s.
Weekend
  • Mostly dry. A slight chance of showers on Saturday.
  • Highs in the upper 40s to low 50s on Saturday, and low 50s on Sunday.
  • Lows in the upper 20s to mid 30s on Saturday morning, and 20s to low 30s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the 50s on Monday, and then becoming warmer.
  • Lows in the mid 20s to low 30s on Monday morning, and then becoming warmer.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the 50s and lows in the low to mid 30s.
Weekend
  • A chance of rain or snow showers on Saturday, and a slight chance of showers on Sunday.
  • Highs in the 40s on Saturday, and 40s to around 50 on Sunday.
  • Lows in the upper 20s to 30s on Saturday morning, and mid 20s to around 30 on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the mid 40s to low 50s on Monday, and then becoming warmer.
  • Lows in the mid 20s to low 30s on Monday morning, and then becoming warmer.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid 50s to around 60 and lows in the upper 30s to low 40s.
Weekend
  • A chance of showers, especially on Saturday.
  • Highs in the mid 40s to low 50s on Saturday, and upper 40s to low 50s on Sunday.
  • Lows in the 30s on Saturday morning, and upper 20s to 30s on Sunday morning.
Next Week
  • A slight chance of rain at times.
  • Highs in the low to mid 50s on Monday, and then becoming warmer.
  • Lows in the mid 30s to low 40s on Monday morning, and then becoming warmer.

Washington State University