Topic: Weather Models

[SouthamptonVaWx]

I have just started subscribing to weather bell, I enjoy looking at weather models, but a lot of it is French to me.

What does 900 mb wind speeds mean for surface conditions?  What impact/relevance does it have to a forecaster in making a forecast.

These model pics look like a significant East Coast event.  Is it really as significant as it appears to me.

What does MSLP mean?

[ocala]

Here is a weather glossary from the NWS. Really helps when trying to figure out what they are talking about in the discussions.
http://w1.weather.gov/glossary/
As for MSLP that's mean sea level pressure.
Not sure about the other one.