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Comparison of
Five Major NWS Data Dissemination Systems
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NWWS |
EMWIN |
IWIN |
FOS |
AWIPS/NOAAPORT |
| Type |
Satellite |
Satelite |
INTERNET |
Land Line |
WAN/Satellite |
| Delay (Sec) |
10 (warnings)
40 (average) |
80 (average)
130 (W/O NWWS) |
130 |
130 |
120 |
| Availability |
99.9 |
98 |
<99 |
N/A |
99.7 |
| Dependency |
NWWS, AWIPS (local) |
NWSTG, AWIPS, NWWS, GOES, Phones |
NWSTG, AWIPS, INTERNET |
NWSTG, AWIPS, Telephone |
AWIPS, Telephone |
| User Cost (initial/Recurring) |
10K / $600-$1600 |
1.5K / 0* |
0 / 0 |
13.5K / 91.5 K** |
95K / 11K |
| Collect Data |
Yes |
No |
No |
No |
Yes |
| Disseminate Data |
Yes |
Yes |
Yes |
Yes |
Yes |
| Remarks |
Fastest product delivery method; Independent of NWSTG and
INTERNET; Terrestrial dial backup ensures data collection. |
Low recurring cost to user; possible data loss during sun
outage periods (2/year) |
Ready availability through INTERNET; reliabililty uncertain
during storm conditions or weather and civil emergencies |
Requires dedicated land circuits to user |
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* User equipment maintenance costs unknown.
** For all six services associated with FOS.
Other NWS Dissemination Systems
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