AgWeatherNet Weekly Weather Outlook for August 10 to August 16, 2013

Scattered Thunderstorms This Weekend then Drier Next Week; Hot Weather Continues

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

As an upper level low pressure system nears the coast this weekend, moist and unstable southerly flow will spawn scattered thunderstorms across the state. The likelihood of seeing some thunderstorms in eastern Washington is a near certainty this weekend. However, as we have already observed this summer, any given location stands only a chance of seeing a storm. Some locations could remain dry for much of the weekend, while other areas experience periods of heavy rainfall, lightning, gusty winds, or even flash flooding under any slow moving storms. The highest chances of storms will generally progress from the south toward the north and east as the weekend unfolds. The other main risk in this pattern would be potential new fire starts from the expected lightning, although it appears that most areas will experience increasingly wet storms over time, which should partially mitigate the danger of dry lightning. High temperatures this weekend will be in the 70s to low 80s in the west, except mid 60s to low 70s at the coast, with lows in the upper 40s to 50s. In central areas, highs will be in the low to mid 90s, with low temperatures in the 60s. In the east, highs will be in the mid 80s to mid 90s, with lows in the 50s. Temperatures in some areas will be cooler on Sunday, although rain and clouds will play a large role in the temperature trends this weekend.

A lingering chance of storms may persist early next week in the east, although most of the period should be dry and uneventful. Temperatures look to remain somewhat stable, although some modest warming is possible by mid to late next week. A range of conditions will be found across Washington, depending upon one's proximity to the ocean. It will be hot east of the Cascades, and warm in interior western areas, while remaining relatively cool and periodically cloudy at the coast. Otherwise, eastern areas around Pullman and Spokane should experience highs in the mid 80s to mid 90s next week, with lows in the upper 40s to 50s. Central areas will climb into the 90s during the day, with low temperatures in the mid 50s to 60s. Interior western areas will see highs in the mid 70s to mid 80s, and lows in the upper 40s to 50s.

Temperatures
  • Generally above average through the period, except near average at the coast.

Rainfall
  • Scattered showers/thunderstorms this weekend, especially in the east.
  • Flash flooding possible under intense or persistent storms.
  • Isolated thunderstorms in the east early in the week.
  • Mostly dry in most areas next week.

Wind
  • Mainly light, except near thunderstorms.

8 to 14 Day Outlook - August 17 to August 23
  • Overall, above 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 and lows in the mid to upper 50s.
Weekend
  • Scattered thunderstorms.
  • Highs in the upper 80s to 90s.
  • Lows in the 60s.
Next Week
  • Mostly dry.
  • Highs in the 90s.
  • Lows in the mid 50s to 60s.

North Central Washington
  • Normal conditions for this time of the year would be highs in the mid to upper 80s and lows in the mid to upper 50s.
Weekend
  • Scattered thunderstorms.
  • Highs in the upper 80s to 90s.
  • Lows in the 60s.
Next Week
  • Isolated thunderstorms on Monday, and then mostly dry.
  • Highs in the 90s.
  • Lows in the mid 50s to 60s.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the mid 80s and lows in the low to mid 50s.
Weekend
  • Scattered thunderstorms.
  • Highs in the upper 80s to mid 90s on Saturday, and mid 80s to low 90s on Sunday.
  • Lows in the 50s to mid 60s.
Next Week
  • Isolated thunderstorms early in the week, and then mostly dry.
  • Highs in the mid 80s to mid 90s.
  • Lows in the 50s to around 60.

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
  • Isolated thunderstorms possible, especially near the mountains.
  • Highs in the mid 70s to low 80s on Saturday, and 70s to around 80 on Sunday, except 60s at the coast.
  • Lows in the 50s.
Next Week
  • Mostly dry.
  • Highs in the 70s and 80s, except 60s at the coast.
  • Lows in the mid 40s to 50s.

Washington State University