AgWeatherNet Weekly Weather Outlook for May 4 to 10, 2013

Hot Weather This Weekend and Next Week

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

Above normal temperatures are expected statewide for the coming seven days, with 90 degree temperatures possible in the hottest areas. A ridge of high pressure will dominate the weather, promoting mainly dry and uneventful weather, with highs in the 70s and 80s. The strong warming will also result in rapid snowmelt, causing rises on rivers and streams this weekend and next week. Despite the apparent simplicity of the pattern, there are several meteorological wild cards that may provide weather highlights during the period. Some areas will see gusty northeast winds on Saturday, as a strong pressure gradient sets up over Washington. It is quite unusual to experience strong and warm winds from that direction. By early to mid next week, a subtropical upper low may cause areas of clouds and instability, and possibly isolated, high-based thunderstorms. However, it is likely that most if not all areas will remain hot and dry. This area of warm and disturbed weather will be very different than normal weather systems that affect Washington, and also very unlike the recent cold storms in April.

Western Washington will likely experience the hottest weather of the year so far this weekend, with the heat even affecting coastal regions. However, large spatial gradients in temperature are expected across the region, depending upon factors like wind flow and proximity to water. The coolest areas this weekend should be the San Juan Islands, the Strait of Juan de Fuca, and other areas like Sequim where even an offshore wind crosses over water. Rapid temperatures changes are also likely in western areas early next week, as hot and dry offshore winds battle cool and moist marine air. At this point, it appears that the cooler southerly wind push will occur at the coast on Monday, and spread inland to interior western Washington around Tuesday, although temperatures should remain above average. East of the Cascades, however, the heat will not peak until early to mid next week. While much of western Washington could cool to the 60s by mid next week, eastern areas should remain in the upper 70s and 80s. Although dry air will initially allow some night-time temperature recovery into the mid 40s to mid 50s, areas that are affected by clouds next week could experience rather balmy low temperatures.

Temperatures
  • Well above normal statewide through the period.
  • Warmest on Sunday at the coast.
  • Warmest on Sunday or Monday in interior western Washington.
  • Warmest early to mid next week east of the Cascades.

Rainfall
  • Mostly dry through the period.
  • A slight chance of showers or thunderstorms next week.

Wind
  • Gusty northeasterly winds on Saturday.
  • Gusty offshore winds at the coast this weekend, switching to onshore next week.

Frost Risk Summary
  • This weekend and next week: Low risk.

8 to 14 Day Outlook - May 11 to May 17
  • Overall, above average temperatures and near to above 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 low to mid 70s and lows in the low to mid 40s.
Weekend
  • Sunny. Breezy on Saturday.
  • Highs in the mid 70s to low 80s on Saturday, and upper 70s to mid 80s on Sunday.
  • Lows in the 40s to low 50s on Saturday morning, and mid 40s to mid 50s on Sunday morning.
Next Week
  • Partly sunny. A slight chance of showers or thunderstorms.
  • Highs in the 80s to low 90s early, and slightly cooler later in the week.
  • Lows in the upper 40s to 50s.

North Central Washington
  • Normal conditions for this time of the year would be highs in the low 70s and lows in the low to mid 40s.
Weekend
  • Sunny. Breezy on Saturday.
  • Highs in the mid 70s to low 80s on Saturday, and upper 70s to mid 80s on Sunday.
  • Lows in the 40s to low 50s on Saturday morning, and mid 40s to mid 50s on Sunday morning.
Next Week
  • Partly sunny. A slight chance of showers or thunderstorms.
  • Highs in the 80s to low 90s early, and slightly cooler later in the week.
  • Lows in the upper 40s to 50s.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the mid to upper 60s and lows around 40.
Weekend
  • Partly cloudy and breezy.
  • Highs in the mid 60s to mid 70s on Saturday, and 70s on Sunday.
  • Lows in the low to mid 40s on Saturday morning, and mid to upper 40s on Sunday morning.
Next Week
  • Partly sunny. A slight chance of showers or thunderstorms.
  • Highs in the upper 70s to mid 80s early, and slightly cooler later in the week.
  • Lows in the mid 40s to mid 50s.

Western Washington
  • Normal conditions for this time of the year would be highs in the low to mid 60s and lows in the mid 40s, except low 40s near Olympia.
Weekend
  • Mostly sunny.
  • Highs in the mid 70s to low 80s on Saturday, except 60s around Sequim.
  • Highs in the upper 70s to mid 80s on Sunday, except cooler around Sequim.
  • Lows in the 40s to low 50s on Saturday morning, and mid 40s to mid 50s on Sunday morning.
Next Week
  • Mostly dry.
  • A slight chance of showers or thunderstorms in the south.
  • Highs in the mid 70s to mid 80s on Monday, except 60s at the coast, and cooling by mid week.
  • Lows in the mid 40s to mid 50s.

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