New NAM Release

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Bob Hartig
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New NAM Release

Post by Bob Hartig » Sat Oct 15, 2011 10:01 pm

I just got wind of the new and significant NAM update that's to be released just a few days hence on Tuesday, October 18. Any plans to revamp F5's NAM accordingly, since the WRF evidently is getting punted in favor of the NMMB? From your perspective, Andy, how do advances in numerical models, such as this one, affect F5?
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Andrew Revering
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Post by Andrew Revering » Sun Oct 16, 2011 8:41 am

I haven't heard anything about this, other than I know this time of year they switch to 'winter physics'. Can you send me some more information on the matter?
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Post by Bob Hartig » Sun Oct 16, 2011 12:43 pm

You bet. Here's a TIN on the October 18 implementation of the new NAM: http://nws.noaa.gov/os/notification/tin ... es_aad.htm

And you can check out NOAA's info on the subject by starting at their Environmental Modeling Center page, here: http://www.emc.ncep.noaa.gov/ In the "Hot Topics" sidebar on the right, you'll find a section for the NAM Upgrade. Start with the link to the PP presentation, "Q4FY2011 NAM Upgrade."

This thing looks to be a major NAM update that replaces the NMM-WRF with the new NEMS-NMMB as the operating model.
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Post by Andrew Revering » Sun Oct 16, 2011 10:06 pm

Thanks for the info.

It doesn't look like anything will change drastically on our end. The data should be largely the same, although Tuesday morning I'll have to watch our data processing to make sure something doesn't get broke. If it does, it will probably mean the initial 12z update may be an hour delayed while I do a quick fix. Then things back to normal after that.

Beyond that the changes will be realized in the accuracy of the model as it is supposedly improved. Sounds like an exciting set of changes that will hopefully make things much more accurate. I'm a little nervous though because I've learned to depend on NAM the way it is now, which in my opinion is quite good. I hope they don't 'break' something in the process.

In the future of F5, we will have more support to take advantage of higher resolutions, future radar, and additional product offerings from these models. I'm planning out a big upgrade to the system, but it will be a while before it all takes place. Probably no sooner than a year before its all done...but we're trying to evolve with time.

Thanks so much for the heads up on this.
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Post by Bob Hartig » Mon Oct 17, 2011 10:15 am

I'm glad to hear that you don't foresee any major problems with the changeover. I wondered how the WRF going bye-bye would affect F5. The change does sound exciting, though I get that the new NAM's four new hi-res nests don't handle severe convection very well. That evidently doesn't trouble the SPC, which has given the NEMS-NMMB a green light with the proviso that focus be given to improving the nests' handling of convection. Overall, this thing sounds like a real stride forward for the NAM.

Great to hear about your plans for upgrading F5 in the future, Andy! I look forward to it when it comes.
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