AgWeatherNet Weekly Weather Outlook for February 23 to March 1, 2013

Active Weather Through Mid Next Week; Becoming Warmer By Next Weekend

Nic Loyd, Meteorologist, 509-786-9357
Gerrit Hoogenboom, Director, 509-786-9371

As the Friday storm departs, the trend will be for decreasing showers and cool temperatures in western Washington on Saturday, although snow showers will linger in the mountains. Otherwise, breezy conditions will linger east of the Cascades, with rain or snow showers around Pullman and Spokane. There will be somewhat of a break in the action on Saturday night and early Sunday, before a relatively weaker system arrives Sunday night. The second storm will bring more rain to western Washington, and snow to the mountains. By Monday morning, rain or snow will reach eastern areas around Pullman and Spokane, as breezy conditions redevelop in central Washington. Although wind speeds and precipitation totals will be less than the current (Friday/Friday night) system, the Sunday night system will still be stronger than the anemic recent systems from earlier this month. Another slightly warmer weather system is possible around late Tuesday into Wednesday morning.

By mid to late next week, the large scale pattern will change again, as the flow switches to southwesterly. While rain, potentially heavy, is a possibility in northwest Washington later next week as part of a pineapple express type setup, it is highly uncertain at this time. There is a chance that the coast or northwestern Washington could have heavy rain at times, while much of western Washington remains dry. In any event, areas east of the Cascades would likely be mostly dry later next week. It appears that significant warming is possible late next week or next weekend.

Temperatures
  • Generally near normal in central Washington.
  • Slightly below normal during the day in western and eastern Washington, and in the mountains.
  • Potentially much warmer late next week and next weekend.

Rainfall
  • Scattered rain showers decreasing on Saturday in western Washington, with scattered rain or snow showers in eastern Washington. Rain developing later on Sunday in western Washington.
  • Rain likely on Sunday night and showers on Monday in western Washington.
  • Rain or snow likely in eastern Washington on Monday morning.
  • Another chance of precipitation around Tuesday night or Wednesday morning.
  • Becoming mostly dry later next week east of the Cascades, except a chance of rain at times, possibly heavy, in northwestern Washington.
  • Mostly dry overall in south central Washington, with a slight chance of rain.

Wind
  • Breezy to windy on Saturday, especially in central Washington.
  • Breezy at times next week, especially on Monday and Wednesday.

Frost Risk Summary
  • This weekend: Moderate risk on Saturday morning, and high risk on Sunday morning.
  • Next week: Moderate to high risk early, and then low to moderate risk later in the week.

8 to 14 Day Outlook - March 2 to March 8
  • It is unclear whether the ridge over the western United States or the trough over the Gulf of Alaska will dominate during this period. This will significantly impact the weather because a southwesterly flow could bring moist systems into Washington, or the ridge could force the systems to our north, and give us drier weather. Currently, the forecast is for near to slightly above average precipitation during this period. Either way, the temperature forecast is much clearer, as warm weather is likely during early March.

Important Points about Next Week's Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the mid 50s and lows in the low 30s.
Weekend
  • Mostly sunny and windy on Saturday.
  • A chance of rain on Sunday night.
  • Highs in the upper 40s to 50s on Saturday, and mid 40s to mid 50s 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.
  • A slight chance of rain or showers at times, especially on Monday morning and Tuesday night/Wednesday morning.
  • Cool early, and then warmer later in the week
  • Highs in the mid 40s to mid 50s early, and then 50s to low 60s later in the week.
  • Lows in the mid 20s to mid 30s early, and then 30s to low 40s later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 40s and lows in the upper 20s to around 30.
Weekend
  • Mostly dry on Saturday, with a chance of rain or snow on Sunday night.
  • Highs in the 40s to low 50s on Saturday, and mid 30s to mid 40s on Sunday.
  • Lows in the mid 20s to low 30s on Saturday morning, and 20s on Sunday morning.
Next Week
  • A chance of rain or snow at times, especially on Monday morning and Tuesday night/Wednesday morning.
  • Highs in the upper 30s to 40s early, and then mid 40s to mid 50s later in the week.
  • Lows in the 20s to around 30 early, and then upper 20s to mid 30s later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the upper 40s and lows around 30.
Weekend
  • A chance of rain or snow showers on Saturday.
  • Rain or snow likely developing late Sunday night.
  • Highs in the upper 30s to low 40s on Saturday, and upper 30s on Sunday.
  • Lows in the upper 20s to low 30s on Saturday morning, and mid to upper 20s on Sunday morning.
Next Week
  • Rain or snow likely at times early, especially on Monday and Wednesday morning.
  • Mostly dry, with a slight chance of rain later in the week.
  • Highs in the upper 30s to mid 40s early, and then mid 40s to low 50s later in the week.
  • Lows in the mid 20s to low 30s early, and then 30s later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the low to mid 50s and lows in the upper 30s.
Weekend
  • Scattered showers, especially on Saturday morning, and then rain developing later on Sunday.
  • Highs in the mid 40s to low 50s.
  • Lows in the mid 30s to low 40s.
Next Week
  • Rain or showers likely at times, especially on Monday and again late Tuesday into early Wednesday.
  • A chance of rain, possibly heavy in northwest Washington, late in the week. Mostly dry in southern areas.
  • Highs in the mid 40s to low 50s early, and then upper 40s to 50s later in the week.
  • Lows in the mid 30s to mid 40s early, and then upper 30s to 40s later in the week.

Washington State University