WeatherWatcher: Weekly Weather - Atmospheric River

Sunday, June 23, 2013

-Unusual Atmospheric River on the way, week ahead forecast
-Last week's highlight
-Last week's data
Unusual Atmospheric River on the way: (Also known as the Pineapple Express) We have an unusual, for this time of the year, weather pattern that will set up for the next few days. We haven't seen one of these in the summer in over a couple of decades. An atmospheric river is pointed at us for at least the next 3 days (through Wednesday). High temperatures through Wednesday will probably hover around the low-mid 60's. Expect quite a bit of rain for this time of year, I can't rule out a 3-day rain total exceeding an inch of rain. Thursday through the weekend we may see a high pressure system re-develop over the region with high temperatures returning to the mid-70's and low 80's and sunny skies!

 Last week's highlight: We had our first rainfall of June, on Thursday with a total rainfall of 0.6 inches. This was an unusual storm that actually rotated moisture in the upper atmosphere from east of the Cascades and Rockie mountains - out of the northern plains. This kind of weather pattern in the middle of the winter would have had a significant chance of generating a major snow event. It is very rare however to have a low pressure system feed us moisture after passing east of the Cascade mountain range.

Last week's weather statistics:
High temperature: 83.8°F (Monday)
Low temperature: 49.6°F (Saturday)
Rainiest day: 0.60 inches (Thursday)
Total rainfall: 0.64 inches
Warmest day: 64.6°F (Monday)
Coldest day: 54.5°F (Thursday)
Average temperature: 60.1°F

Average temperature for last week based on station history: 57.2°F

Warmest and coldest days are based on average temperature of the entire day, starting at midnight. All other averages are based on the whole week, starting Saturday morning at midnight. All weather data unless otherwise noted is sourced from Carl's Shoreline Weather.

For weather related updates or storm warnings, check out my weather station web page or follow me on Twitter: @SWeatherWatcher


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