A frontal system will pass through today and provide us with a an hour or two of moderate rainfall followed occasional light showers through tomorrow. Forecast models also indicate that a healthy Puget Sound Convergence Zone will move south through the city and watersheds after the sun goes down tonight. Brief, perhaps 30-minute […]

    The large, wet system that kicked-off fall yesterday is slowly exiting the region. Post-frontal shower activity, mostly light, will continue today and into tomorrow. As the lowering, but still strong sun tries to poke through the clouds this afternoon, there’s a chance that thunderstorms will develop around us. There are currently no NWS […]

    The first true storm of the season was a respectable one. While rainfall intensities were not statistically significant, the event did set a new daily precipitation record at Seatac (0.72″). It also provided more rainfall (1.52″) in 24 hours than is normal for the entire month of September (1.50″).   Running totals citywide […]

  48hr rainfall according to the latest (12km) UW WRF-GFS   No major changes to overall rainfall amounts this week, however forecast models continue to adjust the timing of frontal passages—moderate-to-heavy rainfall is presently expected around midnight tonight. Also, this weekend is now looking generally dry but showers cannot be ruled out.   The latest NWS […]

  Pre-frontal showers this morning   Meteorological fall began three weeks ago, but the atmosphere decided to wait until astronomical fall to deliver quintessentially seasonal weather.   A weak frontal system will pass through later today and provide the region with a few more light showers. A stronger system will then arrive tomorrow. Forecast models […]

Clouds and scattered showers will linger into tomorrow (Fri) after another weak system passes through the region tonight. Skies will begin to clear tomorrow afternoon, and dry, warm conditions will prevail through the weekend. Forecast models currently show a series of systems affecting the region, perhaps late Monday, and again by late Tuesday/early Wednesday.   […]

  Hot and smoky   After one more day of heat, considerably cooler temperatures will arrive tomorrow, as will cloudiness and a few chances for light rain Wednesday through Saturday. Forecast models are struggling to resolve details toward the weekend, however; the jet stream is actively trying to break down the persistent high pressure that […]

    Strong high pressure off the coast will continue to fend off storm systems and keep high temperatures near or above normal through the weekend. Also, due to “critical combination of wind, low humidity and dry fuels” a NWS Red Flag Warning (fire) is in effect.   The National Weather Service currently predicts no rain […]

    A broad area of low pressure will pass through the region today. Some light rain is possible overnight tonight, but by later tomorrow high pressure and dry, sunny weather will return. Another run at 80 degrees is likely next weekend.   The NWS currently predicts 0.07 inches of rain to fall overnight. The […]

    Dry and relatively warm weather will continue through at least Saturday. The high pressure responsible for the summer reprise is then expected to weaken on Sunday. Forecast models disagree slightly on the extent to which troughing, i.e. decreasing pressure aloft, will occur on Monday (see above).   The National Weather Service currently has […]