Reverse Engines
The polar vortex has been votexing fast and furious in recent weeks...evidenced by a painfully positive AO index and mild temperatures in the East.
All that may be about to change should the ECMWF forecast come to pass.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEig6DuiMd1PfPg3riTOng3OR5Zy6mg59uFezLEOB0Qj7Ewob9IWI1TM-spiAcGgtwbbXoPsaIKVIK5s5KuuosPMJBPdbPEdIvsnV0X_nJsfoOE9OAfiocAUsF4gAMpMANNE-yVDV8ft0Vbb/s400/ecmwfzm_u_f192.gif)
Note the negative values in blue above the Arctic Circle in the D+8 forecast indicating a zonal wind change from west to east. This is likely a depiction of the arctic jet...given the relative strongly negative values.
A strong polar vortex keeps arctic air bottled up over the pole; however...when if it weakens as forecast...the arctic air mass can escape to lower latitudes.
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