AgWeatherNet Weekly Weather Outlook for July 27 to August 2, 2013

Cooler This Weekend; Isolated Showers and Thunderstorms Possible Next Week

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

The prolonged period of hot weather will finally subside this weekend, as marine air moves into Washington, although the critical fire conditions will actually worsen. Strengthening winds and very dry air on Saturday are expected to increase the risk of rapid growth and erratic behavior of any new or existing fires, including the Mile Marker 28 Fire near Satus Pass. Despite the breezy westerly winds, mainly sunny skies will continue in smoke free areas east of the Cascades. Western areas will have increased night morning/clouds due to stronger onshore flow. At the coast, the clouds may linger even during the daytime hours. High temperatures this weekend will be in the 70s in the west, except 60s at the coast, with lows in the upper 40s to mid 50s. In central areas, highs will be in the mid 80s to mid 90s, with low temperatures in the 50s to mid 60s. In the east, highs will be in the 80s to around 90, with lows in the mid 40s to 50s.

Next week, isolated showers and thunderstorms may return to Washington, especially for the mid to late week time period. Although many areas will be dry for much of next week, the upcoming weather system nonetheless represents the best hope in several weeks for a change from the recent dry heat. As this weekend's trough exits the region on Monday, the air flow will turn southerly ahead of an upper low that will develop off the Washington coast. The low will slowly advance toward Washington early next week, bringing a modest yet increasing threat of showers or storms as it progresses inland on Wednesday or Thursday. Although the winds may increase later in the week, increasing humidity levels and even potential clouds or showers could act to at least briefly improve the fire situation. By later next week and into next weekend, the low should depart, which likely will allow somewhat warmer and drier weather to return. In eastern areas around Pullman and Spokane, highs should fall from the mid 80s to mid 90s early next week to the upper 70s to mid 80s by Friday, with lows in the mid 40s to 50s. Central areas will start in the mid 80s to mid 90s early, before cooling to the 80s later next week, with low temperatures in the 50s to mid 60s. Interior western areas will climb into the 70s to low 80s early, before dropping into the upper 60s to mid 70s later in the week, with lows in the upper 40s to 50s.

Temperatures
  • Generally seasonal this weekend and next week.
  • Cooler this weekend, and then warming up early next week.
  • Much cooler again later next week.

Rainfall
  • Mostly dry this weekend.
  • A slight chance of showers or thunderstorms beginning around next Wednesday.

Wind
  • Breezy this weekend.
  • Mainly light to moderate next week, except near thunderstorms.

8 to 14 Day Outlook - August 3 to August 9
  • Overall, near average temperatures and near average rainfall are expected during the 8 to 14 day period.

Important Points about Next Week's Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the upper 80s to low 90s and lows in the mid 50s to around 60.
Weekend
  • Mostly sunny.
  • Highs in the mid 80s to mid 90s on Saturday, and mid 80s to around 90 on Sunday.
  • Lows in the 50s to low 60s.
Next Week
  • A slight chance of showers or thunderstorms by mid to late week.
  • Highs warming to the upper 80s to mid 90s by Tuesday, and then cooling to the 80s by Friday.
  • Lows in the 50s to mid 60s.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 80s and lows in the upper 50s to around 60.
Weekend
  • Mostly dry.
  • Highs in the mid 80s to low 90s on Saturday, and mid to upper 80s on Sunday.
  • Lows in the 50s to mid 60s.
Next Week
  • A slight chance of showers and thunderstorms by mid to late week.
  • Highs warming to the mid 80s to mid 90s by Tuesday, and then cooling to the 80s by Friday.
  • Lows in the 50s to mid 60s.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the mid 80s and lows in the mid 50s.
Weekend
  • Mostly dry.
  • Highs in the mid 80s to low 90s on Saturday, and 80s on Sunday.
  • Lows in the mid 40s to 50s.
Next Week
  • A slight chance of showers and thunderstorms by mid to late week.
  • Highs warming to the mid 80s to mid 90s by early to mid week, and then cooling to the mid 70s to mid 80s by Friday.
  • Lows in the mid 40s to 50s.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid to upper 70s (except around 70 at the coast) and lows in the 50s.
Weekend
  • Mostly dry.
  • Highs in the 70s to around 80 on Saturday, and upper 60s to 70s on Sunday, except 60s at the coast.
  • Lows in the upper 40s to mid 50s.
Next Week
  • A slight chance of showers and thunderstorms at times, especially in the mountains.
  • Highs in the mid 70s to low 80s early in the week, except mid to upper 60s at the coast.
  • Highs cooling into the upper 60s to mid 70s later in the week.
  • Lows in the upper 40s to 50s.

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