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Mika Rantanen
The negative NAO will soon culminate with the strongest ridge in decades (> 4 sigma anomaly). 5880 gpm isoline above Greenland is something you have never seen before (i.e. outside the whole ERA5 climatology).
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Philly Weather Authority Jun 11
What do we attribute the cause?? SSTs? Stratosphere is also deeply disrupted
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Rob Wilkinson Jun 11
What does that mean is simpleton terms?
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Chad Franzen WSAW Jun 11
And this is why I have been calling this the so far. Negative never a good thing in this time of year for the outdoors and especially the .
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London & Southeast Jun 11
Well the unsettled weather now is a product of this last summer we had a very strong +NAO low pressure over Greenland the opposite is true for now. However, it is soon peaking and then hopefully going neutral/positive, this is good increases chance of warm/settled weather.
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London & Southeast Jun 11
And this fits with my summer forecast with an improvement in weather later in June, and this continuing into July this is most likely.
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TV Watcher Jun 11
Fingers and toes crossed you are right ⭐️
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Not Sparta Jun 11
Likely the stratosphere started it, and it's continuing to support it (in concert w/ wavebreaking). Currently SSTs support more +NAO w/ cooler waters near Greenland which would spur on troughing near Greenland
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Philly Weather Authority Jun 11
Earlier when the -NAO began looked like SSTs were more favorable for - NAO, especially early May. But agree with stratosphere + wavebreaking. Like you said keeps feeding the pattern. Probably will see another wavebreak following midweek system.
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josep maria ramentol Jun 12
Tradui?
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Jon Royce Jun 12
Great job of breaking this down. Hope your forecast confirms. Thanks!
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Matt Sutkoski Jun 12
Closer to home, that deep Midwest trough seems ominous to me - heavy rain/flood risk in East?
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Àlex Van der Laan Jun 12
NAO negatiu els provoca altes pressions a Groenlàndia portant a record anomalia d'alçada geopotencial dels 500hp
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josep maria ramentol Jun 12
Gràcies
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