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Model Output Statistics:
Frequently Asked Questions

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Do you archive the MOS guidance?

Yes, click here for more information.

Where can I find a list of all of the acronyms used on the MOS pages?

A list of Frequently used Acronyms has been compiled, more entries will be added.

Is the NGM MOS going to disappear?

Yes, the NGM model and NGM MOS will be removed from NWS Operations on March 3, 2009. See Technical Information Notice - NEW!

What happened to the GFS MOS Ensembles?

The 21 individual GFS MOS Ensemble messages are now available on our website, along with the operational MEX message. The ensemble products are available here.

When are you going to add more elements to the new MOS messages? When will they be complete?

For a full schedule of upcoming additions to the MAV, MEX, and MET messages, check the recent changes page.

Why aren't the products on your website always the most up-to-date?

These web pages are not considered operational, they are only monitored by us during normal working hours (M-F 7 am - 5:30 pm). As with any facility, we sometimes experience problems with our computers that cause the web pages to not be current. We encourage you to read the National Weather Service's Disclaimer and Privacy Policy.

What happened to the MRF FOX MOS?

The obsolete MRF FOX was discontinued as of 0000 UTC on April 08, 2003. Since May of 2000, we have been producing the new GFS MEX MOS, which replaced the MRF FOX.

When do the seasons change in your MOS equations?

It differs by element, model, and message.

ElementGFS MAVNAM METNGM FWCGFS MEX
Temperature 4/1 - 9/30
10/1 - 3/31
4/1 - 9/30
10/1 - 3/31
3/1 - 5/31
6/1 - 8/31
9/1 - 11/30
12/1 - 2/29
4/1 - 9/30
10/1 - 3/31
Ptype 9/1 - 5/31 9/1 - 5/31 9/16 - 5/15 -- CONUS
9/1 - 5/31 -- AK
9/1 - 5/31
Thunderstorms 10/16 - 3/15
3/16 - 6/30
7/1 - 10/15
4/1 - 9/30
10/1 - 3/31
10/16 - 3/15
3/16 - 6/30
7/1 - 10/15
10/16 - 3/15
3/16 - 6/30
7/1 - 10/15
All other Elements4/1 - 9/30
10/1 - 5/31
4/1 - 9/30
10/1 - 3/31
4/1 - 9/30
10/1 - 3/31
4/1 - 9/30
10/1 - 3/31


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Page last Modified: Friday, 12 December 2008 16:52 UTC