What's everyone's best guesses for accumulation???

[badbadivy]

You will be snowed in without the children.  :lol:

Hahaha, I almost wish! Nobody would want to be snowed in with *my* children, that's for sure!

[joemomma]

Well, from what the local news (Nashville) said, it looks like nothing is going to happen until the morning.  Am I correct in this?

[Ron_Jarrell]

Joemomma,

All the models have been consistent with timing on this. For Nashville we're looking at 5-6 am before the start of precip. Putnam Co I'd say you're looking at about 7-8am... maybe a bit earlier as moisture filters in.

PW values on last sounding are already .44"

[joemomma]

PW values on last sounding are already .44"

What does this mean?  Lots of moisture showing up?  This and the soundings (I think) that get posted often I do not understand or know how to interpret.

[Ron_Jarrell]

Yes, PW is the amount of precipitable water in the atmosphere measured in inches.  Basically, it's the amount of water vapor in the air column.

Here's a more involved definition:

precipitable water—(Or precipitable water vapor.) The total atmospheric water vapor contained in a vertical column of unit cross-sectional area extending between any two specified levels, commonly expressed in terms of the height to which that water substance would stand if completely condensed and collected in a vessel of the same unit cross section.
    The total precipitable water is that contained in a column of unit cross section extending all of the way from the earth's surface to the “top” of the atmosphere. Mathematically, if x(p) is the mixing ratio at the pressure level, p, then the precipitable water vapor, W, contained in a layer bounded by pressures p1 and p2 is given by

    where g is the acceleration of gravity. In actual rainstorms, particularly thunderstorms, amounts of rain very often exceed the total precipitable water vapor of the overlying atmosphere. This results from the action of convergence that brings into the rainstorm the water vapor from a surrounding area that is often quite large. Nevertheless, there is general correlation between precipitation amounts in given storms and the precipitable water vapor of the air masses involved in those storms.

[joemomma]

Gotcha.  Seems like I always hears that .25" rain was equal to roughly an inch of snow...is this about right?

[davisjs]

2.5 inches of snow above a thin layer of ice for Brentwood

[Snowman]

davisjs, Welcome to the forum, Keep us updated from Brentwood Tonight!

[Ron_Jarrell]

davis, I sure hope we don't see ice  :cry:

I have to drive to work in the morning

BTW, WELCOME to the site!

[davisjs]

Thanks to both of you. I thought I was alone being an amateur weather buff, but through nashvillewx and this site, I now know that is not the case.  I could be wrong about the ice, but  it does seem like this could be the real thing.

[Ron_Jarrell]

Yeah, you're right davis.  Memphis is looking like they are really under the crosshairs once again.

[drpepper_fool]

I think that Hickman Co. will have a trace of snow and bout .25 ice accumulation.. Thats not what we need but thats whats gonna happen i'm afraid of.. Be without power again like last Christmas, for a week and a half.. Not fun

[Ron_Jarrell]

Wow dr pepper.

I really hope for everyone's sake we don't have an icing situation. The '93 storm I will never forget!

Keep us up to date on the conditions there will you?

[davisjs]

I think Hickman county will get more than that, maybe an inch or inch and a half. I would say you will get a more of a mixture. You have a good chance of being on the dividing line.
 Road conditions are going to be bad regardless, however.