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Why is Olympia, WA Wetter Than Seattle, WA?

Seattle Olympia Weather Climate Pacific Northwest Rain Shadow Washington Puget Sound
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#1
Thunder98

Posted 08 August 2017 - 03:55 PM

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Olympia averages 50.00" of precipitation a year while Seattle averages 37.49" a year. What causes the differences in precipitation amounts between Olympia and Seattle?

 

Attached File  OlympiaClimate.PNG   403.62KB   0 downloads

 

Attached File  SeattleClimate.PNG   453.12KB   0 downloads



#2
wx_statman

Posted 08 August 2017 - 04:06 PM

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Seattle is partially rain shadowed by the Olympics, Olympia is not.


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#3
BLI snowman

Posted 08 August 2017 - 04:09 PM

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Rain shadowing from the Olympics.

SW flow accounts for a large percentage of our region's heaviest rain events, and Seattle experiences much greater shadowing from that direction than Olympia since the Willapa Hills are so much lower.
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#4
Thunder98

Posted 08 August 2017 - 06:43 PM

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Rain shadowing from the Olympics.
SW flow accounts for a large percentage of our region's heaviest rain events, and Seattle experiences much greater shadowing from that direction than Olympia since the Willapa Hills are so much lower.


That is interesting

#5
Front Ranger

Posted 08 August 2017 - 09:05 PM

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Olympia is the city of the gods. That is why it is better than lowly Seattle.


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Cool anomalies soothe the soul.


#6
Geos

Posted 09 August 2017 - 11:14 AM

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Rain shadowing from the Olympics.

SW flow accounts for a large percentage of our region's heaviest rain events, and Seattle experiences much greater shadowing from that direction than Olympia since the Willapa Hills are so much lower.

 

And moisture can flow in uninterrupted for the most part through the Chehalis Gap/Valley into Olympia.


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Univ. of WI Parkside Geosciences (environmental conc.), GIS - 2011

 

2016-2017 snowfall: 14.0"

Total moisture 2017: 25.65"

Elevation: 460 ft
 


#7
WeatherArchive

Posted 09 August 2017 - 05:23 PM

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Does that mean Olympia has a better chance of thunderstorms from convection?


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#8
dairyd

Posted 10 August 2017 - 12:18 PM

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TPW and radar returns from typical SW flow storm.  You can see the rainshadow effect in the TPW isobars in nearly every storm that runs through the area from both the olympic peninsula and vancouver island.
Attached File  rain shadow.png   409.39KB   0 downloads


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#9
Thunder98

Posted 14 August 2017 - 11:31 AM

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Olympia has gotten 0.11" of rain yesterday and Seattle has only got 0.02" yesterday. An example of the Olympic Mountains rainshadow?

 

https://www.wundergr...=99999#calendar

 

https://www.wundergr...=99999#calendar



#10
Front Ranger

Posted 14 August 2017 - 02:11 PM

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Olympia has gotten 0.11" of rain yesterday and Seattle has only got 0.02" yesterday. An example of the Olympic Mountains rainshadow?

 

https://www.wundergr...=99999#calendar

 

https://www.wundergr...=99999#calendar

 

A very weak example, yep. 


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Cool anomalies soothe the soul.


#11
Thunder98

Posted 14 August 2017 - 04:39 PM

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A very weak example, yep. 

 

Once the Pacific NW gets those Pineapple Express in the Fall and Winters then we could see much better examples then what I shown above.







Also tagged with one or more of these keywords: Seattle, Olympia, Weather, Climate, Pacific Northwest, Rain Shadow, Washington, Puget Sound