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12Z Model Thread


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12z ukie is a big hit

GZ_D5_PN_144_0000.gif

That lools rain-ish for NYC/Long Island area and probably coastal SNE with onshore flow.

The 12Z Canadian, sure, it is lame for the MA, but while snow is winding down, still would have nationally televised football in a stadium with snow too recent to clear from stands, so even if snow almost over, snowballs would be possible.

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JMA is in..and its MUCH improved from yesterday

shows a 1011 Low IN SC with a severe storm in the Carolinas and moderate to heavy precip in Richmond. light to Precip in DC. It slides out to sea but some parts of NC would receive over a foot.

Severe Snowstorm for the SE

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JMA is in..and its MUCH improved from yesterday

shows a 1011 Low IN SC with a severe storm in the Carolinas and moderate to heavy precip in Richmond. light to Precip in DC. It slides out to sea but some parts of NC would receive over a foot.

Severe Snowstorm for the SE

I'd feel a lot better if it was the euro showing it and not the jma.

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An ensemble system takes a "control" model run and perturbs the initial conditions of the numerical model to consider the effects of errors in the data assimilation system. Think chaos theory...tiny initial condition errors can result in massive forecast errors with time. The GFS ensemble has I believe 11 perturbed members and 1 control run, and you can take these different solutions and develop a "mean" as well as look at each individual member. So, for instance, if 2-3 members show a large storm and 7-8 don't, the mean will reflect those members showing the storm. In this case I find the individual members more informational than the mean. Height field maps and vorticity maps will help a lot in this case too.

It has 20 perturbed members, one control, and one operational. All but the operational (that is, all 21 that would traditionally be considered ensemble members) are run at 1.0deg 6-hr resolution all the way to hour 384. The operational is run at 0.5deg 3-hr resolution to hour 192, and 2.5deg 12-hr resolution to hour 384.

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