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November 2013
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Archive for November, 2013

First SnowWatch Alert of the Season

  The first SnowWatch alert of the season went out this morning as clear skies and calm winds nudged temperatures below freezing in some city spots. The above image accompanied the alert and shows road surface temperatures (boxed) and air temperatures (unboxed). The key phenomena worth watching are the 2-5° differences between air and road temperatures, […]

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Another Seattle Rain Shadow

Once again, Seattle was kept drier than other parts of the region by a rain shadow. Unlike Friday’s southeast-side shadow, yesterday’s northeast orientation was much closer to normal (see RainWatch 48-hour accumulation image above). 24-hour rainfall totals across the city ranged from just under 0.50″ in places like Maple Leaf and Broadview, while Rainier Beach […]

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Seattle’s Wettest Day of the Year

Today is the wettest day of the year in Seattle. Tomorrow, we begin our long descent towards dry season. Too bad we don’t dry out as quickly as we get wet. Over the past 30 years—the period often used to define climate—November 19th has averaged 0.222 inches of precipitation. (Pictured above is the full 64-year […]

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Adapting to the Rain Shadow

A dramatic rain shadow protected Seattle from significant rainfall yesterday. The non-event had been accurately predicted by models all week. Also well forecasted were the convergence showers that passed through the city late last night. SPU’s extreme precipitation warning system, Seattle RainWatch, wasn’t very busy during the storm that provided power outages and heavy snow elsewhere. […]

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Ocean Circulation and PNW Rainfall Patterns

The world’s oceans and atmosphere are really one large, coupled system. As underwater currents shift, so do global weather patterns. Recent research published in Nature Geoscience and co-authored by University of Washington scientists sheds new light on the phenomenon and suggests that climate change could significantly alter the global distribution of rainfall. Changes in precipitation are […]

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