MEX Card - MDL - Virtual Lab

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About the MEX Text Product
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. Station lists and histories can be found at
MOS Station Archive Page
. Forecast elements are valid from 24 to 192 hours in advance.
Detailed Documentation can be found in the following documents (pdf):
Technical Procedures Bulletin (MEX): "GFS-based MOS guidance - The extended-range alphanumeric messages from the 0000/1200 UTC forecast cycles."
The MEX Message
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| |
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
Go here for more information on climatology
Definitions of Categorical Elements
MEX QPF Categories
no precipitation
0.01 to 0.09 inches
0.10 to 0.24 inches
0.25 to 0.49 inches
0.50 to 0.99 inches
1.00 to 1.99 inches
2.00 inches or greater
MEX Snow Fall Amount Categories
no snow or a trace expected
> a trace to < 2 inches
2 to < 4 inches
4 to < 6 inches
6 to < 8 inches
>= 8 inches
MEX Cloud (CLD) Categories
CL
mostly clear
PC
partly cloudy
OV
mostly cloudy
MEX Precipitation Type (TYP) Categories
pure snow or snow grains
freezing rain/drizzle, ice pellets, or
anything mixed with freezing precip
RS
rain/drizzle and snow mixed
pure rain/drizzle
Canadian Min/Max Temperature Guidance
In addition to the standard MEX output, additional guidance for Maximum and Minimum Temperatures is also available for select Canadian stations. This is currently only available as an all-stations text product (not included in GRIB and BUFR downloadable data).
Canadian Min/Max Temperature
Sample Message
GFSX-BASED STATISTICAL MAX/MIN GUIDANCE 10/26/15 0000 UTC
MON 26| TUE 27| WED 28| THU 29| FRI 30| SAT 31| SUN 01| MON 02
CWRT 47| 30 44| 29 49| 37 50| 35 50| 42 55| 45 49| 27 38
CWRY 56| 33 42| 23 53| 36 58| 31 57| 38 58| 41 55| 30 41
CWSS 45| 23 51| 26 50| 43 62| 40 52| 27 44| 24 45| 26 46
CWST 41| 29 46| 26 46| 43 56| 38 46| 28 40| 26 41| 29 43
CWVN 49| 32 44| 19 45| 23 53| 27 50| 25 56| 36 58| 28 44
CWVU 47| 38 48| 42 51| 49 60| 50 52| 43 45| 39 44| 43 47
CWWB 51| 43 51| 49 59| 48 50| 42 50| 40 51| 43 52| 44 55
CWWF 51| 34 45| 26 40| 20 43| 27 41| 28 49| 38 59| 34 43
CWWZ 52| 44 55| 49 59| 48 51| 43 51| 42 51| 43 54| 45 55
CWYY 57| 39 58| 40 50| 44 55| 43 54| 47 60| 46 56| 40 50
CWZA 59| 49 62| 48 54| 47 56| 48 53| 48 57| 45 54| 42 51
CXDI 51| 36 55| 47 63| 46 49| 36 50| 33 51| 40 54| 41 58
MOS
MOS Products
GFS MOS
Short Range GFS MOS
Extended Range GFS MOS
Coop GFS MOS
Marine GFS MOS
River Basin GFS MOS
NAM MOS
NAM MOS Guidance
Marine NAM MOS
NAM MOS Documentation
MOS Text Bulletins
MOS Product Cards
MAV Card
MEX Card
MET Card
Marine Card
MOS Documentation
Change Log
MOS Technical Notices
Stations
Weather Elements
SHEF Information
MOS FAQ
MOS Verification
GFS MOS Parallel Evaluation 2010
GFS MOS Refresh Evaluation 2009
GFS MOS Parallel Evaluation 2007
NAM MOS Parallel Evaluation 2011
NAM MOS Prototype Evaluation 2008
Score Definitions
Station Info
Verif Station List
Verif Precip Station List