Monday, February 11, 2013

Tuesday, Feb 12 – Rain or snow?




It’s for sure that I will never be confused with being a meteorologist and that’s OK. That fact has never diminished my enthusiasm for watching the weather and wondering what it might bring next.

This coming Tuesday (Feb 12), for instance, will be interesting from the standpoint of potential snowfall. Conditions for that day are such that any precipitation that falls could be of the liquid, frozen or some in-between variety. What causes this uncertainty is depicted (abet rather poorly) in the graphic above. In simple terms, as the low pressure system approaches the Forsyth area sometime on Tuesday morning, it will bring along with it a goodly amount of moisture. Meanwhile, high overhead, the jet stream will be moving in such a fashion as to provide lift for that humid middle layer such that snow will likely develop high up. The tricky part will occur as those flakes fall and then approach the warmer lower levels where winds flowing in from the east. Winds that may have a drying effect on that level.

The question that arises is what effect these drier winds will have. With just the right setup, they may allow for the transport of flakes all the way to the surface (a potential wet bulbing effect). On the other hand, if the temperatures stay just a bit above freezing (33 to 35°F), then it should be a mostly all rain event. The betting is now for a wet Tuesday afternoon with a changeover to snow overnight.

In either case, Tuesday will be a day when everyone should stay alert to rapidly changing conditions!

No comments:

Post a Comment