Jump to content
The Weather Forums

Weird summer weather pattern

Recommended Posts

There is a weather pattern that re-occurs every 7 to 10 years or so, where a massive ridge lodges itself over the western U.S. and the jet stream dives down over the east, bringing cooler and/or wetter than normal summer weather to the Atlantic.  It seems to persist for weeks at a time. We've been in that pattern big time for the past several years.


We had a pattern similar to this in the summers of 2000 - 2004.


Does anyone know what causes this pattern?  Is it an El Nino or La Nina pattern?  Is there some other phenomenon (water temperature in the Atlantic) that causes this to happen? 


Attached is a typical map of what I'm talking about.




  • Like 2
Link to comment
Share on other sites

I can't answer your question. Perhaps Phil will weigh in.

But I agree that there is a pattern. We experience it here in Texas every 8-10 yrs. I recall our last one with moisture and snow in the winter.


This morning we have rain agin and 42*. A 33* wind chill. Crazy for Mid October.

Before You Diagnose Yourself With Depression or Low Self-Esteem,...First Make Sure You Are Not In Fact, Just Surrounded By A$$holes.


2018 Rainfall - 62.65" High Temp. - 110.03* Low Temp. - 8.4*

Link to comment
Share on other sites

It’s probably a combination of solar cycle/IPWP vacillations and other low frequency system resonances modulating the state (and seasonality) of the extratropical circulation cells/annular mode(s). Complicated stuff..as there is no efficient way to determine exactly why these “cycles” exist. But they do exist, for whatever reason.

Link to comment
Share on other sites

It seems that this Western ridge / Eastern trough pattern has become even more persistent than usual over the last 5-6 years during the winter months, causing worsening drought conditions over an increasingly larger area of the west. I am really getting tired of this pattern because Socal has been overall very dry over this 5-6 year time period and am ready for a switch to wetter winters for a change.

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...