Tuesday 9 a.m.
The high pressure area that brought pleasant weather to the Northeast is being followed by a southerly flow of increasing humid and warm air. At the same time, a stream of small disturbances is moving east. This can create zones or pockets of heavy rain. During the coming weekend, the pattern may return to one that favors cooler, drier weather again.
This map shows several boundaries; these are often clues to where concentrated showers are most likely. When the showers are arranged in lines parallel to winds aloft, they can form trains that roll over the same spots for hours and cause flash flooding.
Recently, when cool air masses have moved across the Great Lakes, clouds and showers have broken out downwind. This effect has been pronounced over relatively shallow Lake Erie, which is often the warmest of the Great Lakes. This map shows a forecast of the water temperatures in the region next Sunday.
In yesterday's report I made an analogy about predicting snow amounts using our 16 year old American Eskimo dog Sam as an example. I told Sam about it before taking this picture, but he just looked at me.
This map shows the pressure pattern around the big storm that some people in Boston and Providence are comparing with the Blizzard of '78.
In the worst-hit areas, plan for travel bans (for all non-emergency activities) because of impassable roads and extremely poor visibility. This map shows our projection for snow accumulations by early Wednesday. In many areas the heaviest snow should fall overnight and tomorrow morning.
In the worst-hit areas, plan for travel bans (for all non-emergency activities) because of impassable roads and extremely poor visibility. If you get stranded, rescue crews may not be able to reach you. Storms like this sometimes generate thunderstorms within the heaviest snow bands. The map shows predicted snow accumulations by early Wednesday.
It appears likely that many normal activities can go on through the day Monday, as long as the typical cautions for light to moderate snowfalls are observed. Tuesday will be an <strong>entirely different story</strong>. This map shows the GFS- predicted snowfall through 7 P.M. ET Monday:
The second storm we have been talking about will affect the Middle Atlantic region late Sunday and Sunday night. This GFS forecast map is for 7PM ET Sunday and shows precipitation amounts for the 6 hours up to that time.