Tuesday 11:15 a.m.
This video shows how the weather should behave in the aftermath of Sandy:
Stories, accounts, memories and nightmares associated with Sandy will be told for a long time. It has been an epic storm. The utter devastation in the New York City area looks like it came out of a movie, except the set is real, as is the suffering.
The storm will continue to weaken slowly during the next few days as it drifts to the northeast along with the upper-air storm that "captured" it. It was in some ways a repeat of the October 1991 Perfect Storm, except Sandy came ashore; the Perfect Storm did not.
I just got off the phone with one of our key radio group in West Virginia (Metro Radio News), and we were talking about the heavy snow in their mountains. In parts of Tucker, Pocahontas and Randolf counties, higher elevations have been buried by 3 feet of heavy, wet snow. They had interviewed a couple from D.C. who had decided to "drive west to get out of the way of Sandy" and wound up stuck in the West Virginia snowstorm.
At Chicago, the National Weather Service office said their "south buoy" in Lake Michigan had recorded a tie for second place for the highest wave ever recorded there... just over 20 feet.
With the disaster declarations, President Obama has again joined with his predecessors dating back to the 1920s in federal disaster assistance. The first widespread deployment of such assistance began at the insistence of Herbert Hoover (in advising President Coolidge) in the wake of the great Mississippi River Flood of 1927. Hoover's work and leadership during that flood was said to help his bid for the presidency the following year.
As of 11 a.m., Sandy was centered southwest of the middle of Pennsylvania, as shown on this pressure map.
One concern: the chance of cold frontal snow squalls that could move all the way to the East Coast tomorrow night. Sudden snow squalls have been implicated in chain reaction collisions that turn deadly and damaging.
These two maps show the change from the very, very cold flow likely this Saturday to the much milder Pacific-origin westerly flow later next week.
When we look more closely, we see a variety of disturbances embedded in the main current, each capable of temporarily increasing or cutting off the chance of snow. This map shows the setup:
This map shows the circulation around the offshore storm and a larger but less intense storm moving into the Great Lakes. With this sprawling storm likely to be in the region for several days, the weather can vary widely.
...speculation about a snowstorm Monday or Tuesday, and one is still possible. However, timing and placement remain elusive. This map shows the GFS ensemble mean "solution" for Tuesday morning showing snow just off the New England coast. Watch this story evolve on accuweather.com all weekend.