The heat is on from Los Angeles all the way to Billings, Mont and Bismarck, ND as temperatures are set to soar into the 90s during Monday. It is this blast of heat surging north over the Western US which is tapping unseasonably cold arctic air over northern Canada and driving it south over the eastern half of the US, like a seesaw of air from opposite source regions. This is yet another crazy week of wild weather, very out of wack for the time of year.

The hammer of arctic cold diving into the East will break countless daily record lows from Ontario all the way to north Florida tonight through Wednesday morning and there is even snow to speak. A significant snowstorm dropped close to a foot of snow (30cm) across parts of northern Ontario. The UP of Michigan has seen seveal inches with snow flying as far south as Pennsylvania. Don’t be surprised to see snow flying through the air over western Maryland, West Virginia, western Virginia, possibly even the highest elevations over western North Carolina and Tennessee in coming days.

A system driving into Washington and Oregon is cooling things down along the I-5 corridor but in turn, this is allowing the heat to slide east and north into the Northern Plains.

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Here’s the latest ECMWF chart for Monday showing the high amplification of this early week setup. A lot of heat is pushing northeast from the Deserts where we’re going to see potentially 110 degrees in some spots such as Death Valley.

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Las Vegas should surpass 100 degrees for the first time this year while 90 should be achieved in Salt Lake City for the first time too. The 90s should reach southern North Dakota, possibly up into the Bismarck area. Such areas as Pierre in central South Dakota may get up to 95 degrees.

By Tuesday, while conditions cool across Montana and the Dakotas as the PNW system pushes inland, expect Iowa and Minnesota to really heat up. Des Moines may push the mid-90s while Minneapoilis may get up to 92-94 degrees.

This morning saw record lows in Kansas City where it fell to 33 degrees. The coldest so late in the spring, sound familiar? By Tuesday the same place will approach or exceed their record high for the date of 91 degrees.

Here are forecasted high according to weather.com for Monday.

Notice how chilly it is across the Northeast down into the Mid-Atlantic. Parts of the interior may stay in the 40s all day Monday as the arctic high slides overhead. That’s pretty exceptionally in mid-May to be that cool given the sunshine on offer. New York City may have a tough time getting to 55 while it may be a struggle to reach 60 in Washington DC.

Here’s Tuesday

Lows remain very cold and potentially devastating for the fruit growing industry from New York to West Virginia.

Here are the very latest forecasted lows off the GFS.

Mon am

Tue am

The GFS has persistently looked a little TOO COLD but one cannot ignore it’s persistency in it’s numbers, suggesting a large area from southern NY through a large portion of PA into West Virginia with low to mid-20s with pockets of TEENS which would be not only devastating to fruit growers but unheard for this late into May or May in general in fact.

Lows could dip into the 30s as far south as Atlanta, GA, potentially the mid to upper 40s across parts of North Florida.

Check out this video capturing the snow in northern Michigan on Saturday afternoon. The fact it’s the afternoon hours makes this more impressive given the intensity and height of the sun angle.

[youtube http://www.youtube.com/watch?v=vLBZVH2iur4]

Through the course of this week, temperatures recover to somewhat normality in the East as the heat continues to drigt eastwards across the country.

Here’s the ECMWF chart for Friday.

While I expect more ‘weaker’ troughs to drop into the East from time to time over the East, this should be the last major cold outbreak. Heck it’s mid-May for goodness sakes!

The ECMWF is hinting at a potentially warm spell of some significance from next weekend into the following week. Something to perhaps look forward to if your sick and tired of this relentless cold.

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