Monday, January 10, 2011

Step-By-Step GFS Midwest Storm Analysis

In this special analysis, we will use images provided by the EMC.
So, first out, on the below image, is about 12 hours out. We can see the precipitation moving into the Great Lakes and Midwest.
The low pressure will be in South Illinois at that time, weakening to possibly the weakest degree before it moves into the Ohio Valley. Precipitation should be most abundant in the West Midwest at that time.
6 Hours later, the snow finally shoots into the Great Lakes. The low will be in S. IL still, but more there and present. However, the heaviest precipitation will have already moved into the Ohio Valley.
Another 6 hours later, the low has progressed into the far south Ohio Valley, also bringing along the heaviest snows with it. Lingering snow will continue in the West Great Lakes.
Finally, the two lows combine on the East Coast while lingering snow ends in the West Great Lakes but continues in the Ohio Valley.


NOTICE: As of 7:00am tomorrow, the Winter Storm Central will be easing in to focus in on the Northeast snowstorm.
Until then, you can find more information shortly on the new East Coast Snowstorm page.

Southern low pressure currently centered just offshore of the panhandle of Florida. Storm remains on right track.
At this time, the potential does exist for at least 12 inches of snow in certain New England areas. You can see the depiction on the graphic from the HPC below.
A New England SnowMAP will be issued on the East Coast Snowstorm Page shortly.
Clockwise, the probabilities are as follows. At least 4 inches, at least 8 inches, freezing rain probs, at least 12 inches of snow.

Stunning Northwest Indiana Lake Effect Snow Totals.