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Wake us up when September ends


Damage In Tolland

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We may have a one day burst of warmth perhaps at that time, but then it should relax a bit after. Sept may start out warm, but we need to watch any tropical forcing that may try to pop a ridge over AK.

 

It should also be known that Sept and Oct temps are highly influenced by tropical systems in both Atlantic and Pacific basins. Recurving TCs in the Pacific, recurving Atlantic systems causing a transient -NAO, and also any storm phasing with a digging trough over the lakes all can influence temps. 

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I posted about watching ridging in the NW Canada area several days ago. Models still have it just after hr 240. As been discussed, every now and then operational runs have tried to hint at cold shots coming into the CONUS around this time. They are probably right, but of course details about location and intensity are up for grabs.  The images above certainly don't scream chilly, but it's likely later into the first week of Sept and just beyond where the CONUS will see it's first real shot of cooler air. Although MJO progs disagree in the intensity of the wave, they all try to push us into P8-P1.

 

 

 

 

 

 

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/MJO/CLIVAR/clivar_wh.shtml

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Still looks like a couple of nice cool downs possible in the 1st week of Sept. The second one is a little more up in the air, but models are trying to play around with a strong piece of polar energy diving south through Canada after day 7. At this time we see ridging pump up in NW Canada which allows this to really dig. The question is whether it blows in here like some of the GFS and Euro op runs show, or will it be a glancing blow?

 

 

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There was this gem on last night's d10...

image.jpg

lol congrats Quebec City.

I was completely joking but usually our first flakes are of upslope origin. Makes sense synoptically as our first solid cold shots are usually on strong NW winds with a deep trough moving overhead...we usually have to wait a while to really see our first synoptic snows.

Speaking of which...from BTV:

"Did you know...on this date in 1986, Mt Mansfield recorded it's earliest measurable snowfall? 0.2" fell during the early morning hours following the passage of a strong cold front, which also dropped the temperature there to 32F. Here in Burlington, the high that day was only 60F."

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