North American Oscillation could mean colder spring

Get ready for more chilly weather! There are a few signals that a “Greenland Block” may be in the developing stages! A Greenland Block is when the jet stream buckles to the north over Greenland. Consequently, over North America a big trough brings down cold air for the Upper Midwest. This configuration is referred as the North American Oscillation, or NAO. Occasionally this pattern will maintain itself for longer periods of time (perhaps a few days to a few weeks).

If the NAO develops in this fashion perhaps a few more frosty mornings can be expected. We will be sure to let you know!

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This post was written by qni_it on April 28, 2008

7 Comments so far

  1. tony April 29, 2008 12:34 AM

    And for severe weather fans, that would mean less chance for big severe storms if it is too cold. We will see what happens.

  2. Justin April 29, 2008 2:49 AM

    Blah. At least it’ll be dry the next 2 days. I think I’ll wash my car tomorrow morning. Do the storms for Thursday and Friday show any severe threat? And any major amounts of rain?

  3. Justin Gehrts April 29, 2008 3:49 AM

    Keep in mind that “cooler than normal” doesn’t mean *always* cooler than normal. That’s a long-term average.

    Justin – We’re keeping tabs on the severe storm/heavy rain potential. Still too far away to say for sure, of course, but there’s the possibility.

  4. Adam Painter April 29, 2008 9:51 AM

    Minimal threat here for severe storms on Thursday. The rumbling on Thursday will be west of here in Iowa and Missouri. Some nasty thunderstorms could very well blow up across the Stateline on Friday.

    Paltry rain amounts on Thursday. Soaking rains on Friday.

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