AgWeatherNet Weekly Weather Outlook for June 29 to July 5, 2013

Warmer This Weekend; Very Hot for Early to Mid Next Week

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

The major pattern change that is currently in progress will continue this weekend, with sunny skies and warmer than normal temperatures across Washington. By early next week, extreme heat will overtake the state, as a strong ridge of high pressure builds directly over the Northwest. Before that happens, high temperatures this weekend will generally be in the upper 70s to 80s in the west, except 70s at the coast, with lows in the mid 50s to mid 60s. In central areas, highs will be in the 90s, with low temperatures in the 60s. In the east, highs will be in the upper 80s to mid 90s, with lows in the upper 50s to mid 60s.

As the core of the heat settles over the state during the Monday to Wednesday period, the hottest weather of 2013 will occur. In fact, all-time record high temperatures are possible in some places. The hottest areas of central Washington could reach 110 degrees around next Tuesday. Low temperatures will be rather mild in the 60s and 70s, providing limited overnight heat relief. The most difficult portion of the forecast involves the timing and extent of any extreme heat in western Washington. Despite the expected hot air mass, it is not clear that offshore flow will ever be strong enough to bring hot weather to the coast. Currently it appears that a shallow marine layer will moderate the beaches for much of the period. Interior western Washington will be hotter and somewhat humid, but may receive just enough onshore flow to keep temperatures from achieving their full potential. The heat should peak at the coast on Monday, but perhaps not until Tuesday in interior western areas. Temperatures will likely peak in the Tuesday/Wednesday time frame east of the Cascades.

The most significant concerns next week will be dehydration, as well as a high fire danger as we approach the July 4th Holiday. High temperatures are expected to be in the 80s and 90s in the west for early to mid week, except cooler at the coast, with lows in the upper 50s to 60s. Luckily, cooler weather is likely later in the week. In eastern areas around Pullman and Spokane, highs should be in the upper 90s to 100s, with lows in the upper 50s and 60s for the early to mid week period. Central areas will begin the week in the mid to upper 100s, with low temperatures in the mid 60s to mid 70s. By later next week, less hot weather is expected, as marine air pushes into western areas. However, the ability of the cooler air to infiltrate eastern Washington is uncertain at this time.

Temperatures
  • Above average this weekend, especially in the east.
  • Very hot for early to mid next week.
  • Less hot later in the week.

Rainfall
  • A slight chance of thunderstorms on Saturday.
  • Mostly dry overall, with a slight chance of thunderstorms at times next week.

Wind
  • Mainly light.

8 to 14 Day Outlook - July 6 to July 12
  • Overall, near to above average temperatures and below 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 mid to upper 80s and lows in the mid 50s.
Weekend
  • Mostly sunny, with a slight chance of thunderstorms on Saturday.
  • Highs in the 90s on Saturday, and mid 90s to around 100 on Sunday.
  • Lows in the 60s.
Next Week
  • Mostly sunny.
  • Highs in the mid to upper 100s through mid week, and then less hot later in the week.
  • Lows in the upper 60s to mid 70s.

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 to upper 50s.
Weekend
  • Mostly dry, with a slight chance of thunderstorms on Saturday.
  • Highs in the upper 80s to 90s on Saturday, and mid to upper 90s on Sunday.
  • Lows in the 60s.
Next Week
  • Mostly dry.
  • Highs in the 100s through mid week, and less hot later in the week.
  • Lows in the upper 60s to mid 70s.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the upper 70s to around 80 and lows in the low to mid 50s.
Weekend
  • Mostly dry, with a slight chance of thunderstorms on Saturday.
  • Highs in the upper 80s to mid 90s.
  • Lows in the upper 50s to 60s.
Next Week
  • Mostly dry.
  • Highs in the upper 90s to 100s through mid week, and less hot later in the week.
  • Lows in the 60s to around 70.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid 70s (except upper 60s to around 70 at the coast) and lows in the mid 50s.
Weekend
  • Mostly dry, with a slight chance of thunderstorms on Saturday, especially over the mountains.
  • Highs in the mid 70s to 80s on Saturday, except low 70s at the coast.
  • Highs in the 80s to low 90s on Sunday, except upper 70s at the coast.
  • Lows in the mid 50s to mid 60s.
Next Week
  • Mostly dry.
  • Highs in the 80s and 90s early, except possibly cooler at the coast, and then cooler everywhere later in the week.
  • Lows in the 60s early, and then cooler later in the week.

Washington State University