Wednesday, 9 a.m.
A southerly flow of increasingly moist air is spreading up the I95 corridor, where the dawn was greeted by dreary dullness and dim, drab drippiness from Maryland to Massachusetts. There are also some showers from western New York to Ohio along a cold front that will reach the East Coast this evening. When that cold front arrives, it will usher in a dry air mass that pulls back the curtain of clouds to reveal brilliant sunshine that plays off the multicolored leaves in the Northeast from tomorrow into the weekend.
In New York City and Philadelphia, typical afternoon temperatures are well up in the 60s at this time of year. Nights cool to about 50 in the cities, but well down in the 40s in many suburbs. The air masses in place from tomorrow through Saturday will bring temperatures that run about a half-dozen degrees below those long-term averages. Saturday morning is apt to be frosty in the colder suburbs from Washington, D.C., to New York City and below freezing in upstate New York and much of New England's interior. However, a strong southwesterly flow of warmer air could boost temperatures to 70 degrees in these areas on Sunday afternoon.
A strong storm is likely to cut through the Great Lakes Saturday night and Sunday, and its associated cold front will trigger showers and even thunderstorms. However, the air coming in behind that storm should not be as chilly as the air that follows this week's fronts. The reason: this week's upper air flow into the Northeast can be traced back to northwest Canada. Next week's main upper air current looks like it will be straight west to east. The video has more.
This map shows the pressure pattern as it was early this morning. The low pressure center in western North Carolina will move out to sea tonight and the snow now falling farther to its north will collapse southward.
The part of the front over the Eastern states will move south this afternoon and tonight, then a low pressure area will move along it. The result should be snow from the Ohio Valley into the Middle Atlantic states.
The thin blue line is temperature. Notice how it is left of the black line near the bottom, meaning the ground level temperature is below freezing. Several thousand feet overhead, however, it is warmer than 32 degrees, so any snow falling through that layer melts.
Today is the National Education Association's Read Aloud Day. If you have young children or grandchildren, I hope you get the chance to read to them today, and on many other days. On today's video, I tried reading to you.
The storm moving from the Ohio Valley to the Middle Atlantic coast will cause snow and ice, Clearing should follow tomorrow, but another storm should bring snow and ice followed by rain from Maryland to Massachusetts.
Clearing should follow tomorrow, but another storm will cause snow and ice followed by rain from Maryland to Massachusetts late Tuesday into early Wednesday.