AgWeatherNet Weekly Weather Outlook for August 18 to August 24, 2012

Hot and Dry With A Chance of Thunderstorms This Weekend; Less Hot Next Week

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

Despite a degree of temperature moderation in western Washington this weekend, extremely hot weather will persist east of the Cascades. Saturday will be the hottest day of the period, with highs above 100 across much of central Washington, and in the 90s in eastern Washington around Pullman. Western Washington will be in the upper 70s to 80s, except upper 60s at the coast. Sunday will be slightly cooler, though still uncomfortable east of the Cascades. Highs will fall into the 90s to low 100s east of the Cascades, and 70s to low 80s in interior western Washington. Low temperatures will be in the 50s to around 60 in western and eastern Washington, and 60s to low 70s in central Washington. There will be a chance of high-based thunderstorms on Saturday, which could spark more fires in the tinder dry environment. No appreciable rain has fallen in Washington during August, and some areas have been rain-free for longer than one month. Most of the outlook period looks dry area wide and mostly sunny skies will dominate east of the Cascades. Areas west of the Cascade will experience periodic morning clouds and afternoon sunshine. Lows will be in the mid 50s to mid 60s in most areas of central Washington, and in the upper 40s to 50s in eastern and western Washington. Overall, a more typical period of warm to hot weather in the east and pleasantly mild in the west will resume early next week. The general trend for next week will be cooler weather as the week progresses. There is a chance that a low pressure system could arrive later next week, potentially bringing cool and breezy weather state wide, and the first rainfall to Washington in over a month.

Temperatures
  • Well above normal this weekend east of the Cascades.
  • Near normal in the west and above normal east of the Cascades early next week.
  • Cooling on Sunday in western Washington, and early to mid next week in eastern Washington.
  • Further cooling later in the week.

Rainfall
  • Mostly dry through the period.
  • A slight chance of mainly dry thunderstorms this weekend.
  • A slight chance of rain later next week.

Wind
  • Generally light to moderate.
  • Possibly increased winds later next week.

Important Points about Next Week's Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the mid to upper 80s and lows in the 50s.
Weekend
  • Mostly sunny and dry. A slight chance of thunderstorms.
  • Highs in the upper 90s to mid 100s on Saturday, and mid 90s to low 100s on Sunday.
  • Lows in the 60s on Saturday morning, and mid 60s to low 70s on Sunday morning.
Next Week
  • Mostly sunny and dry.
  • Highs in the 90s early, and trending toward the 80s to around 90 later in the week.
  • Lows in the mid 50s to mid 60s early, and cooler later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the low to mid 80s and lows in the mid 50s.
Weekend
  • Mostly sunny and dry. A slight chance of thunderstorms.
  • Highs in the upper 90s to mid 100s on Saturday, and mid 90s to low 100s on Sunday.
  • Lows in the 60s on Saturday morning, and mid 60s to low 70s on Sunday morning.
Next Week
  • Mostly sunny and dry.
  • Highs in the 90s early, and trending toward the 80s to around 90 later in the week.
  • Lows in the mid 50s to mid 60s early, and cooler later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the low 80s and lows in the upper 40s to low 50s.
Weekend
  • Partly sunny and dry. A slight chance of thunderstorms.
  • Highs in the 90s on Saturday, and low 90s on Sunday.
  • Lows in the upper 40s to 50s.
Next Week
  • Partly sunny and dry.
  • Highs in the mid 80s to mid 90s early, and trending toward the mid 70s to mid 80s later in the week.
  • Lows in the mid 40s to mid 50s early, and cooler later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the 70s (except upper 60s to around 70 at the coast) and lows in the low to mid 50s.
Weekend
  • A slight chance of thunderstorms.
  • Highs in the upper 70s to around 90, except around 70 at the coast on Saturday.
  • Highs in the 70s to low 80s, except 60s at the coast on Sunday.
  • Lows in the 50s to low 60s.
Next Week
  • Mostly dry. Morning low clouds and afternoon sunshine.
  • Highs in the 70s to around 80 early, and trending toward the mid 60s to mid 70s later in the week, except 60s at the coast.
  • Lows in the upper 40s to 50s.
Washington State University