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Description of the GFS MOS MEX Alphanumeric Message
The extended-range GFS-Based MOS (MEX) guidance is generated from the 0000 and 1200 UTC cycles of NCEP's Global Forecast System (GFS) Model.
This guidance is valid for stations in the United States, Puerto Rico, and the U.S. Virgin Islands.
For the most recent station list click here.
Forecast elements are valid from 24 to 192 hours in advance.
Sample Message
IAD GFSX MOS GUIDANCE 3/05/2013 0000 UTC
FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192
TUE 05| WED 06| THU 07| FRI 08| SAT 09| SUN 10| MON 11| TUE 12 CLIMO
X/N 47| 34 42| 32 44| 29 45| 32 50| 33 57| 38 58| 40 54 29 53
TMP 42| 36 39| 34 39| 32 41| 34 44| 37 50| 42 52| 43 47
DPT 23| 26 28| 24 29| 24 25| 25 29| 30 34| 34 38| 34 28
CLD OV| OV OV| OV PC| CL PC| CL CL| PC OV| OV OV| OV PC
WND 5| 18 20| 20 16| 13 22| 14 8| 5 8| 5 10| 18 14
P12 36| 99 93| 36 5| 0 7| 5 5| 7 17| 30 35| 31 24 24 24
P24 | 100| 36| 7| 6| 19| 53| 46 34
Q12 0| 5 5| 0 0| 0 0| 0 0| 0 0| 1 |
Q24 | 5| 0| 0| 0| 0| |
T12 1| 1 7| 2 1| 0 1| 1 1| 1 2| 1 5| 4 6
T24 | 1 | 9 | 2 | 1 | 1 | 2 | 6
PZP 13| 27 4| 13 9| 6 6| 17 13| 6 5| 4 4| 4 5
PSN 25| 4 28| 16 45| 64 52| 32 24| 16 2| 3 4| 4 21
PRS 28| 47 29| 45 26| 16 15| 18 8| 3 4| 4 3| 9 14
TYP RS| Z RS| RS S| S S| S RS| R R| R R| R R
SNW | 4| 0| 0| 0| 0| |
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- FHR = Forecast hour, i.e. how many hours from the model run time
- X/N = daytime max/nightime min temperatures
- TMP = temperature valid at that hour
- DPT = dewpoint valid at that hour
- CLD = mean total sky cover over the 12-hr period ending at that time
- WND = maximum sustained surface wind (WND) during a 12-h period
- P12 = 12-hr probability of precipitation (PoP) ending at that time
- P24 = 24-hr PoP ending at that time
- Q12 = 12-hr quantitative precipitation forecast (QPF) ending at that time
- Q24 = 24-hr QPF ending at that time
- T12 = 12-hr probability of thunderstorm ending at that time
- T24 = 24-hr probability of thunderstorm for the 1200-1200 UTC time period ending at that time
- PZP = conditional probability of freezing pcp occurring for the 12-hr period ending at that time
- PSN = conditional probability of snow occurring for the 12-hr period ending at that time
- PRS = conditional probability of rain/snow mix occurring for the 12-hr period ending at that time
- TYP = conditional precipitation type for the 12-hr period ending at that time
- SNW = snow fall categorical forecasts during a 24-h period ending at the indicated time.
- CLIMO = for information on climatology, please click
here.
Definitions of Categorical Elements
MEX QPF Categories
| 0 | no precipitation |
| 1 | 0.01 to 0.09 inches |
| 2 | 0.10 to 0.24 inches |
| 3 | 0.25 to 0.49 inches |
| 4 | 0.50 to 0.99 inches |
| 5 | 1.00 to 1.99 inches |
| 6 | 2.00 inches or greater |
MEX Snow Fall Amount Categories|
| 0 | no snow or a trace expected |
| 1 | > a trace to < 2 inches |
| 2 | 2 to < 4 inches |
| 4 | 4 to < 6 inches |
| 6 | 6 to < 8 inches |
| 8 | >= 8 inches |
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MEX Cloud (CLD) Categories
| CL | mostly clear
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| PC | partly cloudy |
| OV | mostly cloudy |
MEX Precipitation Type (TYP) Categories|
| S | pure snow or snow grains |
| Z | freezing rain/drizzle, ice pellets, or | | anything mixed with freezing precip |
| RS | rain/drizzle and snow mixed |
| R | pure rain/drizzle |
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Page last Modified:
Tuesday, 30 July 2013 19:51 UTC
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