MailASail GRIB Service |
This is an alternative route to GRIB files from the US GFS (global model).
Simply send an email to: weather (at) mailasail.com and enter your grib request in the SUBJECT line of your email. Use the following format for the SUBJECT line:
grib [type_of_grib] [region_of_interest] [times] [grib_fields]
Where:
[type_of_grib] is the grib type. Choose from:
gfs - NOAA GFS/AVN Global model covers entire world including overland. Resolution is 1x1 degree every three hours from 0-180 hours.
nww3 - NOAA NWW3 wave model. Prediction is only for open water areas, ie excludes inland waterways such as the Mediterranean and the Black Sea, it is also likely to be "inaccurate" in coastal regions. Resolution is 1x1.5 degrees every three hours from 0-180 hours.
[region_of_interest] is the lat and lon of the area you wish to obtain the grib data. Can be entered in several formats:
30N:40W:2400 - specifies an area which is approximately 2400 miles wide and tall centered on 30N:40W (ie center of the Atlantic). If you omit the radius parameter then 1200 miles is assumed.
10N:60W:50N:20W - specifies a square area from 10N:60W to 50N:20W
named area - you can simply specify a named area. Defined areas are: atlantic, caribbean
[times] Comma seperate list of offsets of the desired forecasts in hours.0 hours is usually from the point the model was run - however, the models take around 3+ hours to run and so the 0 hour data will already be old by the time the data is available.
eg 12,24,48,72
[grib_fields] - grib fields of interest. Available fields vary depending on the model chosen
GFS Model:
GRD - wind speed
PRMSL - pressure at mean sea level
TMP - surface temperature
HGT - 500mb height
NWW3 Model:
GRD - wind speed
WAVE - significant wave height and direction
WVPER - significant wave periodicity
TO: weather (at) mailasail.com |
Returns windspeed and pressure GRIB data from the GFS model for a very large region covering the central north Atlantic at 12 hour intervals over the next three days |
TO: weather (at) mailasail.com |
Returns windspeed and wave GRIB data from the NWW3 model for a large region covering the central north Atlantic at 24 hour intervals over the next three days |
When using a boxed region of interest you must specify the coordinates of the box from west to east, if you reverse the coordinates then you will get a large area that wraps around the globe and excludes the area you were after!
The size of the data file returned is proportional to the amount of data requested. If you are "bandwidth constrained", for example on a satellite phone or SSB, then please start by requesting small areas to assess the size of files returned. Choosing fewer time periods, fewer grib fields or a smaller area will reduce the amount of data returned.
The data is returned as an uncompressed grib file. The entire email will be compressed automatically if you are using our email compression system "Express Mail" (and often also by the SSB email services), so there is no benefit in pre-compressing the file
If you are using a cellular or satellite phone and you are NOT using our email compression system then you are spending much more money on calls that you need to! See our website at http://www.mailasail.com for more information on how to subscribe to our Express Mail email compression service.
If you are still unsure about how to use this service, then for additional help please email: support (at) mailasail.com
Important note: Grib files are computer-generated forecast files from an NCEP/NOAA computer, which are sent without review, and are offered on an as-is basis. There is no assurance that the data is available, accurate or correct. Tropical systems in particular are not well-modeled. Both the MailASail Weather Responder and the computer model itself are automated systems, subject to a variety of failures and errors. By using the data, you acknowledge and agree to these limitations.
For information about GRIB files and obtaining viewers go to Frank Singleton's GRIB page.
The MailASail weather page is at http://www.mailasail.com/Main/Weather
Their email service page is at http://www.mailasail.com/Main/EmailCompression
Return to Free GRIB services page
© Frank Singleton November 2006
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