NE.Wx Snowfall Forecast Contests

"Winter weather patterns in North America are dictated by changes to the polar vortex winds high in the atmosphere, but the most signi...

-19.14 (just inside 1-sigma from the mean) OCT is now the 5th month with a QBO index below zero having flipped in JUN following its 14 month...

 " AER explains how accelerated Arctic warming, known as Arctic amplification, is increasingly disrupting the polar vortex, leading to ...

"The term polar vortex has become part of the everyday vocabulary after the widespread media coverage of the extreme cold events ove...

 From Judah Cohen's (AER) blog ... "I have been arguing for at least a decade now that the winter season is shifting ahead in ...

Brief ... less dramatic stratospheric warming at 30 mb on 20-DEC-18 has faded only to be replaced by a much larger  ... stronger ... and ve...

Game On! Major sudden stratospheric warming (SSW) in the cards and being dealt. Figure 1 :  10 hPa temperature change in a week in the ...

Polar vortex (PV) displacement event appears to be in the cards come Christmas. Full flow reversal + warming ==> major sudden stra...

Full reversal at D+5 (12-FEB) comports very well with the earlier D+10 forecast .   Full reversal continues at least through D+10. ...

Something worth keeping an eye on ...   D+10/s polar vortex splits in two with action centers over northern Canada along ~90W and ~45E...

Polar vortex centered over Barents Sea. Anticyclonic circulation over NOAM 10 mb circulation The HIGH made a strong attempt to displa...

Displacement event/s peak progged for early next week.   PV displaced SW by warm pulse. Center of anticyclone does not advance as fa...

Could be the season/s final stratospheric warming event. Images from 15-FEB-17 ECMWF run. Weak high-altitude zonal flow returns after th...

The well forecast major warming 'displacement' event is well underway. Major warming:  temperature increase >= 25°C over seven d...

Displacement event looms near month's end.     --- QBO > 10 kt Strong STJ (50 kt) Weak PV (30 kt) Flow reversals abo...

A sudden stratospheric warming (SSW) event may be in the works for the last week of the month. After weeks and weeks of a high-speed rotat...

Temperature change of -25°C over seven days & 10 mb flow reversal.  Images courtesy Japan Meteorological Agency . --- Previ...

UPDATE (01-FEB-18): As advertised ...     Looks yuge. Beat the rush. Start laying in supplies now. --- 10 mb Temperature A...

ECMWF continues to signal PV weakening near month's end. Initial panel (right) @ 80 m/s (155 knot; 179 mph). D+10  @ 60 m/s (117 k...

Following a recent cross-hemisphere shift of the polar vortex's (PV) center of circulation from NW Greenland to the Barents Sea ... th...