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

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

Tuesday, December 27, 2011

Winter '11 / '12 - Sudden Stratospheric Warming Watch - Update 2

It's official!

A 'minor' stratospheric warming...no longer a figment of NWP/s imagination...was observed at 10 mb by the Japanese Meteorological Agency (JMA) for the seven-day period ending 25-DEC-11.

A minor warming event is defined as an observed 25°C temperature increase over "... a week or less at any stratospheric level in any area of winter time hemisphere. The polar vortex is not broken down and the wind reversal from westerly...to easterly...is less extensive." ¹

The heavy red shadings denote the 25°C threshold.
The image is approximately oriented north-south along 140°E longitude.
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Previous update here.

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