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August 2014
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Monday Morning Wx

Posted: August 25th, 2014

image08232014_500m

 

Save for the smoke that has filtered down from British Columbia, our current weather is about as normal as it gets right now in Seattle. (Above is a somewhat recent NASA satellite image showing fires in red and blueish smoke drifting throughout the region.) Normal at this time of the year, of course, means anxiety around Labor Day plans and impending falls rains. We’ll have more confidence in the forecast by mid-week, but let’s hope that you enjoyed the weather this past weekend.

 

The high pressure system responsible for this sun and warmth will gradually weaken over the course of the week, but not before high temperatures reach at least the mid-80s on Tuesday and Wednesday. By the weekend, an upper level low pressure system is forecast to approach the region from the northwest. Cooler and cloudier conditions with scattered light showers are possible by Saturday.

 

Excerpts from this morning’s NWS Area Forecast Discussion:

AN UPPER RIDGE JUST OFFSHORE WILL PROVIDE FAIR WEATHER OVER THE REGION TODAY THROUGH WEDNESDAY

THE ONSHORE PUSH OF LOW CLOUDS AND PATCHY FOG WILL STRENGTHEN THROUGH THE WEEK. TONIGHT IT LOOKS LIKE THE PUSH MAY MAKE IT FURTHER INLAND…AND WEDNESDAY MORNING THERE IS A CHANCE IT MAY COVER MUCH OF THE PUGET SOUND REGION. AS THE NIGHTS ARE GETTING LONGER…WE WILL BEGIN TO SEE PATCHY RADIATION FOG FORM IN PRONE LOCATIONS AS WELL.

THE MODELS HAVE STAYED CONSISTENT IN THE LONGER RANGE. THEY SHOW THE ZONAL FLOW CONTINUING THURSDAY…THEN BACKING TO SOUTHWEST ON FRIDAY AS AN OFFSHORE UPPER TROUGH APPROACHES THE REGION. ONSHORE FLOW WILL INCREASE…AND MARINE LAYER STRATUS WILL PROBABLY PUSH FURTHER INLAND WEDNESDAY NIGHT AND THURSDAY NIGHT. THE TROUGH SHOULD REACH THE AREA SATURDAY AND MOVE INLAND SUNDAY FOR A CHANCE OF SHOWERS…BUT PRECIPITATION AMOUNTS WILL PROBABLY NOT BE VERY SIGNIFICANT.

 

References:
NASA MODIS: Fires in the Northwest
SPU Climate Change program