Arthur has lost tropical characteristics as he speeds NNE, currently positioned over the Gulf of St Lawrence. Arthur not only produced hurricane conditions over North Carolina’s Outer Banks but arguably, the system, deep in it’s transition phase brought damaging winds as well as flooding rain to the Canadian Maritimes.

The latest visible satellite imagery from space faintly shows what’s left of Arthur over the Gulf of St Lawrence, note the trailing front as he’s baroclinic now!

Also notice the convective ball on the tail of that front in the very area where Arthur became the season’s first hurricane.

Thanks to an already deep trough sliding east over the Great Lakes and the wake of Arthur, we saw some rather cool daytime maximum temperatures over the Midwest and eventually over the interior Northeast. While New York managed to reach it’s first 90 (before Arthur’s cloud, rain moved in), Chicago stayed in the 60s all day.

SNOW was reported via radar down to just 3,000ft over the mountains of Maine.

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Glorious, comfortable weather is now over the Northeast in the wake of Arthur but warmer weather from the west will move in in the coming days.

While one tropical cyclone moves out, another, much more formidable system a half a world away needs to be monitored. Powerful Typhoon (soon to be Super Typhoon) Neoguri is winding up SE of Japan and threatens the southern islands as a powerhouse 150 to 180kt system.

The reason this system has importance to US weather is we’re likely to see a re-curve scenario which leads to a second major trough into the Great Lakes and East within 10-14 days.

Check out the latest water vapour over the NW Pacific and see what Japan is likely to be dealing with in the coming days.

Note the re-curve track by the JTWC

Check out the ECMWF 500mb global height anomalies through the next 10 days. Note the amplification of the Pacific-North America pattern towards the end of the period with deepening of the N Pacific trough which in turn pumps the Western US ridge and as a result deepens an eastern trough. Could lead to significant heat in the West, cool East.

See today’s video for discussion!

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Tags: recurving typhoons, typhoon neoguri, US pattern, us weather