Thursday 10 a.m.
3.14159 ... that's pi, and the decimal digits go on from there. Since today is March 14, 3/14, today is National Pi Day.
Pi is the ratio of a circle's circumference to its diameter. One equation using pi has always been a little confusing to me: pi r squared = circumference, where r is the radius of the circle and pi is pi. But, when you read the equation out loud, you are claiming pi are squared, and that is bad grammar and misleading as well. Most people will agree that a pie is round, and that squares with my experience except in the case of square pizza. However, even then, you would say a pie is square, not that pi are squared.
Now before you come after me with the hypotenuse, let's get off this tangent and back to the weather. Right now, cold air encompasses all of the Northeast. This morning, folks from West Virginia northeastward could accurately claim that there were snow flurries within a radius of 100 miles from their loci. However, at times the clouds will break enough for you to enjoy some of the sun's radians.
Looking ahead to tomorrow and the period through the weekend and into next week, a series of low pressure areas with precipitation will come toward the Great Lakes and Northeast from different angles. This will determine the variation of temperature degrees with each disturbance and suggest whether you will get a few showers or a protractored period of snow. This video may help you figure out what will happen where you live... and extricate you from my wrecked tangle of text.
On the map, showers and thunderstorms were located along and ahead of the gray line that cuts through Pennsylvania and along/ahead of the blue line. Both should be off the East coast by Thursday. Drier air from the Upper Midwest should filter into the Northeast later in the week.
The large storm that drenched the Northeast during the weekend has drifted out to sea and somewhat drier air is coming in to replace it. However, another upper air trough extending from Wisconsin to Louisiana is supporting several pockets of showers and thunderstorms.
From northern West Virginia across most of Pennsylvania and western and central New York, there could be several inches of rain with flooded streets and streams.
...will move east to bring rain overnight from parts of Virginia to Southern New England. In the southern part of this area there can be some violent thunderstorms late today and tonight. The rain will depart tomorrow, but a large storm is likely to affect the Middle and North Atlantic states this weekend.
This activity map produced by the National Weather Service Storm Prediction Center overlays existing areas of thunderstorms on the map showing various risk levels.
The radar image below showed a line of showers and thunderstorms extending from the Hudson Valley of New York to the middle of Pennsylvania. The heaviest rain shows up in red. These storms were near Lake Erie four to five hours earlier and will head toward and then past the I-95 corridor this afternoon and tonight.