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Local Time: May 25 2016, 04:46 PM
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31 Dec 2014
Its not up to me. Its up to you. Majority should rule at the end of the day and that seems like the fairest way to decide on formatting. Please vote above.
31 Dec 2014
I know this idea has worked well on other forums and it has been approved by the mods. This thread will be dedicated to any non storm related discussion(short term OBS) including any complaints you feel you need to get out which is totally understandable. Storm threads should be kept to analysis, model images, forecasts, OBS etc. Enjoy!
19 Oct 2014
With winter quickly approaching(wow did that go by quickly) I thought this would be a good idea seeing as it was a hit last year. You must predict the amount of snowfall that will occur between Nov 15th and April 15th for the 5 locations listed. You can edit as many times as you want up until that point.
The member who gets the minimum cumulative departure will win. For example if you think Toronto will receive 100cm and they receive 90, you get a score of ten. Member with the lowest score wins. I will be tracking the scores throughout the winter as snow begins to fall....
Snowfall Forecasts in cm Valid for the following locations. I chose North York station over YYZ this year due to the nipher gauge problem.
Climate ID: 615S001 (North York, On):
AJW(St John's, NL):
Contest closes on November 15th at 12:00 AM. Hopefully we can get a lot of participants. Good luck!
6 Sep 2014
Some absolutely incredible parameters showing up on the GFS/Euro for an outbreak this late in the summer. Timing/phasing issues still need to be sorted out but potential looks sky high with this outbreak which will usher in the fall like air later next week(including major snows for Calgary and the foothills as the high drops down and forces and easterly flow against the rockies). Kinematics look insane with a LLJ at or above 60kts on the euro/gfs for 0z/6z thursday. Dews are near 70f and PWATS are near 2" so moisture is definitely present. Strong sfc-400mb shear is present in both the speed and directional department with backing at the surface. Models are not to be trusted just yet on instability params as they tend to underdo the extent of the WAA at this range.
Sounding near TO shows the impressive kinematic support:
GFS_3_2014090606_F114_44.0000N_79.5000W.png ( 54.92K ) Number of downloads: 1
Low level jet valid between 0z-6z thurdsay:
Screen_Shot_2014_09_06_at_11.13.06_AM.png ( 1.25MB ) Number of downloads: 3
PWAT's and MSLP:
ecmwf_pwat_slp_ma_22.png ( 187.17K ) Number of downloads: 4
This should be interesting!
20 Jun 2014
Thought I would get this started as I and I'm sure many of us are starting to look into next winter more closely now that summer is getting underway. Pretty clear that a moderate el nino is fairly likely going into next winter although models diverge on exactly how strong or weak it is going to be in time for winter. As a rule, the weaker and further west-based the el nino, the higher the likelyhood of cold and snowy conditions across much of Eastern Canada and the great lakes. Heres a post I wrote yesterday on the U.S forum on some of the factors I'm looking at besides ENSO.
Few comparisons I made this morning, using an ONI base state between +0.7 and +1.5c. All el nino/-QBO years on the right with nino/+QBO years on the left. We should be in a -QBO shear phase this DJF nearing the -QBO peak late winter. Note how the -QBO years tend to have a pretty strong -NAO block with lower heights surrounding the block and a -SAM/+PDO state in the means. Whether solar activity increases or decreases heading into winter will be very important as you run the risk of ending up similar to 91-92 although it's definitely not a guarantee either way.
post_26371_1403189534_thumb.png ( 148.89K ) Number of downloads: 1
The PDO dataset is also pretty interesting with the positive years on the right. I am expecting the PDO to remain positive through next winter as the nino continues to gradually strengthen. This is consistent with the NMME/JAMSTEC suite's. Note how PNA and EPO ridging is stronger in the +PDO years and the state of the NPAC is completely opposite. This tends to favour areas further SE for the heavy snow's as it takes any nina component out of the pattern.
post_26371_1403190098_thumb.png ( 161.96K ) Number of downloads: 0
Couple things i'll be monitoring besides solar:
1) Positioning of the NPAC warm pool. If it can retrograde, look for the storm track to want to shift further west. If it continues to shift East into a more classic +PDO horseshoe position, as i am expecting, the mid atlantic will be more favoured in terms of storm track/snow interests.
2) The warm SST's off the east coast tend to pump up a stronger SE ridge like 51-52 saw in the December-January period.
3) Keeping an eye on the positioning of the nino. Currently favouring a slightly west based nino although it could very well end up providing more basin wide like forcing.
4) We just came out of a long lasting la nina period. ONI spikes coming after at least a double nina look like this with no ENSO sorting:
post_26371_1403191033.png ( 13.56K ) Number of downloads: 0
5) SLP pattern across N Siberia in october. This goes hand in hand with the SAI feedbacks.
Positive AO el nino december's at 250mb w/ Oct SLP anoms on the left. Notice the negative SLP anomaly across N Siberia:
post_26371_1403193187_thumb.png ( 254.42K ) Number of downloads: 0
-AO years are completely opposite in December, both in terms of the heights pattern and October SLP setup. Keep in mind that 8 of those 10 positive AO December years continued with a +AO in January as well, so the SAI is huge. In feb, the AO state mattered little as troughiness still dominated over the northeast/great lakes. for these reason, definitely focusing more on the DJ period.
post_26371_1403193312_thumb.png ( 256.53K ) Number of downloads: 0
Cuz it's never too early...
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