CONTEST STATUS - Updated: SUN ... 187-NOV-18 @ 7:30 PM EST

Winter '18 / '19 - Snowfall Forecast Contests

20th Annual 'Regular Season' Snowfall Forecast Contest

What's A 'Contest-worthy' Storm?

Snow Storm #2
Synoptiscope in VCP32

Snow Storm #1
FINAL results here

18th Annual 'Season-total' Snowfall Forecast Contest
Verification period: 01-DEC-18 thru 31-MAR-19
Deadline for entries: 11:59 PM EST ... FRI ... 30-NOV-18
Details here

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Winter '17 / '18 - Snowfall Forecast Contests
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19th Annual 'Regular Season'
FINAL results here

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17th Annual 'Season-total'
FINAL results here

Wednesday, November 15, 2017

Winter '17 / '18 - NOV/s Arctic Oscillation: Winter/s Leading Indicator

The sign of NOV/s Arctic Oscillation (AO) index has a statistically significant (Chi-square Test for Independence; p <= 0.05) association with the sign of the average AO index during meteorological winter (D-J-F).

 AO Contingency Table
 p = 0.046 Nov + Nov - Total
 D-J-F + 16 10 26
 D-J-F - 15 26 41
 Total 31 36 67
 True + 52% 28% False -
 False - 48% 72% True +

'True + (-)' indicates a true (false) prediction.

IOW ... if NOV/s AO is negative ... then there's a 72% chance the winter's average AO/s sign will also be negative ...

...and the association between the AO/s negative sign for NOV and D-J-F has a 28% 'false alarm rate' (FAR).

The relationship is nowhere near as strong when NOV/s AO is positive (48% FAR).

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Interesting ... albeit different ... relationship between NOV/s North Atlantic Oscillation (NAO).

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