Thursday, January 16, 2020

Winter '19 / '20 - Snow Storm #2: Outlook


UPDATE: 16-JAN-20 @ 7 PM EST
Progs trending away from a contest-worthy event.

Outside chance the evening runs will proffer a better solution.  Otherwise ... we/re back to waiting.

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Original post (15-JAN-20 @ 2:55 PM EST)
Third time's a charm ... three on a match ... ménage à trois ... three to get ready ... or whatever; another chance for this winter/s second and long-awaited contest-worthy snow storm appears in the offing over the upcoming weekend.

Latest progs from national and international numerical weather prediction models covering the medium range distribute more than nuisance snowfalls over two-thirds of the forecast area.

Mixed precipitation associated with over-running  / isentropic ascent and the possibility for development of a secondary surface LOW in the nearshore waters along the Gulf of Maine will present forecasters with multiple precipitation-type challenges.

Should short range model guidance continue the currently favorable medium-range scenario ...

Call for Forecasts would be issued on THU ... 16-JAN-20.
Deadline for entries would be 10:00 PM EST ... FRI ... 17-JAN-20
Verification would begin: 12:01 AM EST ... SAT ... 18-JAN-20

Image courtesy pivotaleweather
NEWxSFC web site here

Sunday, January 5, 2020

Winter '19 / '20 - 'Season-total' Snowfall Forecast Contest: DEC Totals

DEC-19 snowfall summary by forecast station.
Rank ordered descending by percent of monthly period-of-record-normal (P-O-R-N).

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Green ==> 75th - 100th percentile
White ==> less than 75th and greater than 25th percentile (inter-quartile range)
Red ==> 0 - 25th percentile

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DEC Forecast Station Highlights
BDL
- DEC/s 22" was 224% above its monthly P-O-R-N of 9.8"
- almost half its season-total normal

ORH
- DEC/s 27.6" was 223% above its monthly P-O-R-N of 14.4"
- 46% of its season-total normal

ALB
- DEC/s 27.9" was 205% above its monthly P-O-R-N of 13.6"
- half its season-total normal

Biggest losers
ORF & RDU:  0"

Observed v P-O-R-N (less than 15%)
PHL:  0.1" v 3.6"
SBY:  0.05" v 1.6"
MDT:  0.2" v 5.6"
RIC:  0.1" v 1.9"
BWI:  0.3" v 3.1"
DCA:  0.4" v 2.7"

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Season-to-Date

DEC P-O-R-N contributes 203.3" (22%) toward the season-total snowfall (D-J-F-M) of 929".
DEC-19 observed snowfall:  224.6" (10% above P-O-R-N; 24% of season-total snowfall)

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Teleconnections