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January 3-6th Winter Storm Part 2


Chicago Storm

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This was not the "latest run" but an alternate model to The RPM. This is how Skilling is forecasting the 4-8. The model in your picture is the low end while the RPM is higher for Chicago.

 

Which one was this then? Another in house model?

 

GFS

 

gfs_total_precip_east_14.png

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Larry Cosgrove just posted on FB a forecast of 2-4 for Indy with ice.  The storm will not go boom until Ft Wayne.  :axe:

 

 

When the shortwave finally interacts with the massive Arctic motherlode to its west, snow intensity will likely explode. This is why a box 100 miles either side of a line from Fort Wane IN to Orilia ON can expect a blizzard with strong winds, 12 to 16 inches of snow

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I continue to expect intensification on future model runs. However, let's say the result is something like a GEM/UK blend. One factor to consider is that the gradient will be stronger than the central pressure might imply because of the strength of the arctic high. A 980 low with a 1040 high will have the same pattern as a 990 low with a 1050 high (except on its eastern side).

 

Even with that moderate sort of outcome pressure-wise, this could still dump a very heavy snowfall due to lake enhancement in most of Indiana, western Michigan and northern Ohio. So while I would agree with the maps showing 5-8 inches in IL, could see 15-25 inches in some of those other regions, probably about 10 inches for Detroit. If the storm intensifies, would double most of these numbers.

 

Snow squalls in southern and central Ontario, western NY will start out as NW type but swing around to WSW flow. This could spread some fairly heavy snowfalls over a large area with max amounts 20-30 inches or more.

 

Toronto is wait and see on this current scenario, would think 3-5 inches is fairly certain but there could be some mixing briefly if the track is anything west of Erie-Toronto.

 

The intensification scenario remains on the table because many model depictions only need a slight tweaking of the upper flow to expand the tight core of the PV and this would probably result in 10-15 mb extra deepening before Monday 06z. Having those sub-490 thicknesses so close to a baroclinic zone in the Great Lakes region is almost unprecedented.

 

The 1978 storm tracked almost due north from Alabama to Lake Huron, Sarnia had a pressure of 955 mb at about 13z on 1-26-78, so for comparison, this storm can only become perhaps 70% as strong given the more diagonal track. Still and all, 70% of that monster would be all most folks could handle given there's already a foot of snow on the ground.

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Yeah by 60 hours its in central Quebec. And my apologizes in the other post as it should have been 48 hours. 

 

Edit: For YYZ, 0z GGEM looks like all snow. Marginal temperatures near the Lake. 

 

Yeah I just saw. Looks a good front end thump for Toronto. 

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