WA 2012 Water Year Summary
A water year in the Pacific Northwest begins on October 1 and ends on September 30, and is labeled by the year it ends in. According to the American Meteorological Society’s Glossary of Meteorology, “It commences with the start of the season of soil moisture recharge, includes the season of maximum runoff […] and concludes with the completion of the season of maximum evapotranspiration”.
Read moreEarly Fall Storms in the PNW and their Connection to Western North Pacific Typhoons
This month marks the 50th anniversary of the Columbus Day storm, by many measures the strongest extratropical storm to hit the lower 48 states in the past century. The Columbus Day storm formed out of the remnants of Typhoon Freda.
Read moreOn the Flavors of El Niño
It may seem that the climate community is often making a fuss about the phenomenon of El Niño-Southern Oscillation (ENSO), and this impression is correct. Why is there such an emphasis?
Read moreHot Summer Weather and Low-level Ozone Concentrations
Ozone (O3) is an important pollutant in many regions, especially during summer months, and Washington State is no exception. While O3 is beneficial in the upper-atmosphere through its absorption of damaging ultraviolet (UV) radiation, it is harmful near the surface.
Read moreWeather in WA State on the 4th of July
There is the common impression that the weather on the 4th of July is generally crummy, at least on the west side of Washington State. Here we take the opportunity to critically examine that perception, and to compare the climatology of that day on the west versus east side of the Cascade Mountains.
Read moreHigh May Streamflow Conditions in WA
During May, there were numerous fatal accidents on WA Rivers that made headlines, along with a remarkable rescue. Two children died on the Chehalis River in separate incidents and an Everett City Councilman died on the Green River in a rafting accident.
Read moreWA Pollen Counts versus Rainfall
The spring pollen season appears to have started rather late this year, at least in western Washington. From a personal perspective, I usually start exhibiting symptoms in about the middle of March, apparently due to an allergy to birch and alder pollen, but this year it happened noticeably later.
Read moreA Review of Winter 2011-2012
La Niña conditions prevailed in the equatorial Pacific Ocean for the second winter in a row. Cooler and wetter than normal conditions in Washington State are typically associated with La Niña episodes – did this past winter fit those expectations?
Read morePlant Hardiness Zones for WA State
The US Department of Agriculture has recently posted new plant hardiness information; a map for WA state is reproduced here (Figure 1) and can be found at the following website: http://planthardiness.ars.usda.gov/PHZMWeb/.
Read moreThe Western WA Snow and Ice Event of January 2012
The period of 14-19 January 2012 featured some heavy snowfall, and significant freezing rain, in the lowlands of western Washington. An overview of the meteorology behind this event, snowfall totals, and some of the local impacts of the week of wintry weather will be explored in this newsletter highlight.
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