Unusual Warmth to Dominate the East into Next Week
Significant backdoor front from Ontario through eastern Pennsylvania dividing unusual warmth (70s-80s F) from the typical March chill (30s-40s) to the east and north. This front will not move too much through tomorrow then gradually get washed out over the weekend. There will be some cooling Saturday.
From Sunday through Thursday, it looks like a second surge of incredibly warm air by March standards will overwhelm much of the eastern half of the U.S. and eastern Canada with near-record highs, especially Tuesday into Wednesday. This air mass actually could outperform, in terms of warmth, the one that has been hanging around recently.
No doubt the trees, grass, shrubs, bugs, birds and other animals are pretty confused. Hopefully, this May-like March does not turn into a March-like April. No signs of that at least right now.
The PSU EWALL image below shows the expected temperature anomalies (F) for Wednesday next week.
As you can see, an incredibly large region once again will experience temperatures anywhere from 20 to 30 degrees F warmer than what they should normally be. I have never in my 23 years of forecasting seen such a widespread, long-lasting area of extreme late-winter/early-spring warmth.
As I type this on my kitchen table, I can look out the window at the leaves bursting out of the buds of my Persian Lilac bush, which is unheard of in March at my location.
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A different story in the West.....
A large trough of low pressure with very cold air aloft will slowly progress inland through the West Coast as we head into the weekend. This system will bring heavy snowfall and low temperatures to the mountains through the early weekend. Snow levels will drop to below 1,000 feet over southwestern British Columbia by Saturday, but it should be mostly light rain in Vancouver and through the lower valley.
Below is the University of Washington high 4km resolution WRF/GFS model forecast for 24-hour snowfall in inches ending early Saturday evening.....
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