AgWeatherNet Weekly Weather Outlook for June 27 to July 3, 2015

Major Heat Wave Begins This Weekend

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

The second heat wave of June will strike Washington on Saturday, as temperatures soar into the 100s east of the Cascades, and 90s in interior western areas. The hottest central areas could peak at 110-112 degrees, while eastern border areas may reach 105 degrees. Interior western areas are likely to top out in the upper 80s to 90s, although Vancouver may reach 100 degrees on Saturday. The immediate coast might be very lucky, and is expected to only peak in the 70s or 80s. While a marine push could lead to significant cooling on Sunday for coastal and western areas, central Washington should be just as warm, while eastern areas could be even hotter on Sunday. Lows will become rather sultry, as some central areas should remain in the 70s on Sunday and Monday mornings, with isolated spots only dropping to around 80 degrees.

Every notable weather event has a unique character, and this upcoming heat wave is no exception. One item of interest is the unusually muggy nature of this particular air mass. Although anyone from the south or midwest would scoff at such a description, it should nonetheless be abnormally humid this weekend by Northwest summer standards. Dew points could be in the 50s east of the Cascades, and 60s in some western areas. As a result, isolated, dry mountain thunderstorms are possible. Unfortunately, these storms would likely have more lightning and wind than rain, which could spark wildfires and then fan the flames in the current dry fuel environment. Thankfully, some convective debris clouds may keep high temperatures from reaching their full potential in a few areas through about Monday, although such clouds would have the undesired opposite effect at night.

Less miserable conditions should push into eastern Washington early next week, before very hot weather returns around mid week. Mercifully, the second round should be more of a dry heat, although there will not be any clouds to help mitigate the oppressive daytime temperatures. Even if we are spared from numerous natural ignitions this weekend, the human element will come into play next weekend, as Independence Day fireworks meet up with the anticipated parched conditions.

Temperatures
  • Near record heat on Saturday in the west, and this weekend east of the Cascades.
  • Less hot days on Sunday and Monday (early next week) in the west (east).
  • Hotter again for the middle portion of next week.

Precipitation
  • Mostly dry through the period.
  • A slight chance of mainly dry thunderstorms over the mountains this weekend and perhaps into Monday.

Wind
  • Breezy in the west on Sunday, and in the east on Monday.

8 to 14 Day Outlook - July 4, 2015 to July 10, 2015
  • Overall, above average temperatures and below average precipitation are expected during the 8 to 14 day time frame.

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 dry. A slight chance of dry thunderstorms on Sunday evening.
  • Highs in the mid 100s to around 110 on Saturday, and 100s to low 110s on Sunday.
  • Lows in the mid 60s to mid 70s on Saturday morning, and 70s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the upper 90s to mid 100s early, and then warmer.
  • Lows in the 70s on Monday morning, and then cooler, and possibly warmer later in the week.

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

Eastern Washington
  • Normal conditions for this time of the year would be highs in the low to mid 80s and lows in the low to mid 50s.
Weekend
  • Mostly dry. A slight chance of dry thunderstorms on Sunday night.
  • Highs in the upper 90s to 100s on Saturday, and 100s to around 110 on Sunday.
  • Lows in the upper 50s to 60s on Saturday morning, and mid 60s to mid 70s on Sunday morning.
Next Week
  • Mostly dry. A slight chance of dry thunderstorms on Monday.
  • Highs in the 90s to around 100 early, and then warmer.
  • Lows in the upper 60s to mid 70s on Monday morning, and then cooler, and possibly warmer later in the week.

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

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