CONTEST STATUS - Updated: WED ... 13-DEC-17 @ 8:30 PM EST

Winter '17 / '18 - Snowfall Forecast Contests
19th Annual 'Regular Season'
Snow Storm #1
Synoptiscope in VCP32

17th Annual 'Season-total'
Deadline for entries has passed
Forecasters' summary here

Winter '16 / '17 - Snowfall Forecast Contests
18th Annual 'Regular Season'
FINAL results here
16th Annual 'Season-total'
FINAL results here

Monday, January 5, 2015

Winter '14 / '15 - Weakening Polar Vortex ==> Sudden Stratospheric Warming: UPDATE 6

The current sudden stratospheric warming (SSW) event has likely peaked as evidenced by
1)   the deep layer wind reversal of the polar vortex (PV) and
2)  a dipole of hi-latitude warming maximized INVOF eastern Greenland.

Image:  10-hPa temperature change in a week in the Northern Hemisphere (courtesy Tokyo Climate Center, Climate Prediction Division).  The contour interval is 5 °C. The pink and light blue shadings indicate warming and cooling, respectively. The red shading denotes warming for values higher than 25 °C.

Upper air analysis courtesy University of Wyoming, College of Engineering, Department of Atmospheric Science

Deep-layer hi-latitude easterlies ~30 KTs.

Arctic Oscillation (AO) poised to tank by mid-month.
D+11 prog of a near-perfect AO tri-pole and a stationary... four-wave pattern.
Bonus OB:  DEC QBO dipped to -25.35.

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