Mid-Atlantic/Northeast US soaking rain-to-snow
Once low pressure reaches the Ohio Valley early Thursday, it will encounter a strong blocking pattern in the atmosphere across southern Canada. As a result, the low will no longer be able to push to the north and will be “forced” to take a turn to the south and east – ultimately ending up off the Mid-Atlantic coastline by early Friday. Rain will spread into the Mid-Atlantic region/Northeast US on Thursday and become heavy at times into tomorrow night and there can even be some thunderstorm activity. This will be the first significant precipitation event of the month of March in many areas as it has been an unusual extended dry spell.
Meanwhile, strong high pressure will build into southeastern Canada on Thursday and – as the surface low takes its turn to the south and east – colder air will follow and drop southeastward from southeastern Canada into the Mid-Atlantic/Northeast US. As a result, the rain will change to snow in a northwest-to-southeast fashion later tomorrow night into early Friday with the first area to see the changeover being in the northern and western interior sections of the Mid-Atlantic/Northeast US. By early Friday, there is likely to be a mixing with or a complete changeover to snow all the way down into the I-95 corridor region from DC-to-Philly-to-NYC. Snow accumulations are certainly on the table later tomorrow night/early Friday; especially, across the interior higher elevation locations of the Mid-Atlantic/Northeast US. Cold, dry air will take control in the northeastern quadrant of the nation for late Friday and Saturday, but a warm up begins on Sunday. In fact, temperatures should be back up in the 60’s early next week in the DC, Philly, and NYC metro regions.
Meteorologist Paul Dorian
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