Thursday, January 24, 2008

Another Winter Weather Threat?

A little weather lesson for you. Evaporation is a cooling process. You
feel cool when you get out of the shower because the water is
evaporating from your skin. When rain falls into very dry air, the
water evaporates cooling the surrounding air. That's how you can see
sleet or snow when the temperature is above freezing.

Tonight,
cold and very dry air is moving into the state while at the same time
another weather system is pushing into Texas. This batch of moisture
will approach our area late in the day Friday and Friday evening. As
the rain falls into the dry air there could be enough cooling for
sleet. Sleet is frozen rain drops. Rain that falls into a cold layer
and freezes the drop. It looks like the rain or rain and sleet mixture
will be light. I am also expecting temperatures to be above freezing as
all this occurs. Bottom line, this does not look like it will be a
major winter storm and there should not be any accumulations. Therefore no BIG problems.

In
north Mississippi there could be enough cooling that some bridges could
become slick but there is still the question if the precipitation will
be heavy enough. It could very well be too light. This area would
generally be in the south Delta over to Greenwood and to the north
Check batch, I am watching this very closely for any changes.

Posted at 4:02 PM

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