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Southern Ontario Spring 2015 Discussion


snowstormcanuck

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Definitely enjoyed this storm more than 12/11/14. Peak rates were more impressive, drifts are more impressive and overall tracking more enjoyable IMO.

 

Each their own. I liked Dec 2014 more for its consistent +SN over several hours, consistent good flake quality, the fact that it was an over performer, and the fact that we weren't teased with 30-40cm amounts just miles away. And I'm not a fan of drifting due to the havoc it wreaks for measuring.

 

I will concede your tracking point though. This storm was the first truly satisfying tracking storm of the winter for me.

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Caught up in the current storm, why don't we look ahead for future storm threats. The 18z RGEM has about 2-5cm for the GTA and most of Southern Ontario for tomorrow night-Wed. 

 

post-6644-0-27142700-1422918501_thumb.gi 

 

In contrast, the 18z GFS has 5-10cm across the area by Thursday. The GFS shows this 5-10cm over a 24 hour period. 

 

post-6644-0-43881900-1422918643_thumb.gi 

 

The 18z Nam is drier than the GFS over the consensus, but still paints a good 5-10cm for SW Ontario. 

 

post-6644-0-20199900-1422918735_thumb.gi 

 

The next image below is the 18z RGEM. The secondary wave as you can see in this image is what needs to be monitored. At this point in time the ECMWF/UKMET and GGEM/RGEM are the wettest and the most furthest West than the GFS/NAM. With the S/W hanging back in the south, there will likely be some influence from the Gulf into this northern stream, but any phase that does occur will likely be after it passes through the region. 

 

post-6644-0-73579300-1422918826_thumb.gi

 

Lastly, this is what the 12z UKIE had in store for the region. I posted the Euro text earlier btw. 

 

post-6644-0-77757800-1422918894_thumb.gi 

 

Lets see what the 0z runs hold in store for tonight. 

 

 

 

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Caught up in the current storm, why don't we look ahead for future storm threats. The 18z RGEM has about 2-5cm for the GTA and most of Southern Ontario for tomorrow night-Wed. 

 

attachicon.gifPR_000-048_0000.gif

 

In contrast, the 18z GFS has 5-10cm across the area by Thursday. The GFS shows this 5-10cm over a 24 hour period. 

 

attachicon.gifUSA_ASNOW24_sfc_054.gif

 

The 18z Nam is drier than the GFS over the consensus, but still paints a good 5-10cm for SW Ontario. 

 

attachicon.gifUSA_ASNOW24_sfc_054 (1).gif

 

The next image below is the 18z RGEM. The secondary wave as you can see in this image is what needs to be monitored. At this point in time the ECMWF/UKMET and GGEM/RGEM are the wettest and the most furthest West than the GFS/NAM. With the S/W hanging back in the south, there will likely be some influence from the Gulf into this northern stream, but any phase that does occur will likely be after it passes through the region. 

 

attachicon.gifP1_GZ_D5_PN_054_0000.gif

 

Lastly, this is what the 12z UKIE had in store for the region. I posted the Euro text earlier btw. 

 

attachicon.gifPA_000-072_0000.gif

 

Lets see what the 0z runs hold in store for tonight. 

 

A week ago I was excited for the 5cm clippers bring and I still am. 

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Should be interesting to see what happens with LE tonight. The 4kNAM/RGEM want to back winds to the ESE after ~4z tonight as the clipper passes by to our SW. Inversion heights look favourable as they are near the 850mb level with nice saturation in the BL.

 

Definitely something to watch especially from Midtown to Oshawa.

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Storm total of 12.8 cm. 6.6 cm on the 1st and 6.2 on the 2nd.

The number at the U of T station downtown should be higher. The observer there hasn't entered the data yet into the EC climate database.

 

Eek. 

 

YKF has 21.8cm for the 1st, so I assume they put the 2 day total on 1 day. Will have to wait and see what they update with for the 2nd. It bodes well with the EC met report of 22cm in SE Kitchener near YKF. Not too sure how trustworthy the higher reports are, but YKF has comes in lowest of all reports in the past. IMO we got 25-27cm tops.

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Not bullish on tomorrow's snow. Looks like a cm or two max. NAM hitting than downslope signal hard and it's usually been right about that this winter. Wouldn't surprise me if it's just a coating.

 

Friday-Saturday and Sunday-Monday potential looking more interesting, but being clippers, it's hard to get too excited.

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The 12z Euro has a big hit for most of Southern Ontario as it has a more robust clipper moving in from the Prairies, merging with some S/W energy in the south. More uplift energy as a result and the storm becomes more potent. Here is the text output for YYZ.

ECMWF FORECAST FOR: YYZ    LAT=  43.67 LON=  -79.63 ELE=   568

 

                                            12Z FEB03

                 2 M     850     SFC     SFC     700    6 HR     500    1000

                 TMP     TMP     PRS     RHU     RHU     QPF     HGT     500

                 ©     ©    (MB)    (PCT)   (PCT)   (IN)    (DM)     THK

 

SAT 12Z 07-FEB  -6.8   -10.6    1015      88      99    0.02     540     529    

SAT 18Z 07-FEB  -4.9   -11.0    1013      77      78    0.04     540     530    

SUN 00Z 08-FEB  -6.9   -12.1    1016      76      83    0.01     542     530    

SUN 06Z 08-FEB -11.1   -13.7    1020      80      97    0.00     543     528    

SUN 12Z 08-FEB -14.7   -13.6    1022      79      99    0.05     544     527    

SUN 18Z 08-FEB -14.0   -11.0    1020      79      99    0.22     542     528    

MON 00Z 09-FEB -13.7   -11.7    1018      83      99    0.27     541     528    

MON 06Z 09-FEB -14.7   -13.0    1020      81      90    0.20     538     523    

MON 12Z 09-FEB -16.4   -14.3    1026      81      18    0.02     541

I'm posting this with my phone, so idk if it can be seen properly.

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Not bullish on tomorrow's snow. Looks like a cm or two max. NAM hitting than downslope signal hard and it's usually been right about that this winter. Wouldn't surprise me if it's just a coating.

Friday-Saturday and Sunday-Monday potential looking more interesting, but being clippers, it's hard to get too excited.

Agree on tonight's snow. The best area to be is in the eastern GTA.

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Not bullish on tomorrow's snow. Looks like a cm or two max. NAM hitting than downslope signal hard and it's usually been right about that this winter. Wouldn't surprise me if it's just a coating.

Friday-Saturday and Sunday-Monday potential looking more interesting, but being clippers, it's hard to get too excited.

Hope this isn't the case

HRRR has a nice spread of 1-2" by the end of its current run with healthier looking reflectivity. It's showed worse downsloping effect before.

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The Sun-Mon system is definitely interesting. Since its originating out of the N branch, there is the more probable scenario that it trends further and further South. On the other hand there is also the potential for enough interaction with the pac branch to keep the sfc low north enough to get a 12z euro type scenario. In order for this to happen there needs to be perfect timing/amplitude however.

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