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New England Pilot Project (NEPP) Data



The New England Pilot Project (NEPP) was originally launched as the New England Temperature and Air Quality study. This was an effort to quantify the improvements in the forecasting of temperature and air quality in the New England region which would result from new and augmented observations and modeling. There are approximately 200 sites in the New England area that provide data. The data is available on NOAA Port and MADIS ingests the data via the SBN. MADIS has been decoding the Standard Hydrormeteorological Exchange Format (SHEF) NEPP messages since May 4, 2004.

Before November 23, 2009, NEPP data was collected as part of the NWS Cooperative Observer Program (NWS-COOP). The data was collected and stored in the LDAD/coop directory. Since April 16, 2010 the NEPP data have been stored in in the LDAD/NEPP directory.

Geographic Coverage

Before November 23, 2009 CONUS + Alaska. After April 16, 2010 just the New England area.

Data Schedule

The expected reception and observation times are dependent on the type of station. Phase I stations send 15-minute observations in a batch once an hour. Phase II stations send 5-minute observations in a batch once an hour.

MADIS stores the data starting at the top of the hour and ending 59 minutes after the hour (e.g., the 0000 file covers 0000 - 0059).

Data that arrive after 2 hours following the time of the observation are processed in a "data recovery" mode, where once a day batch processing is performed to reprocess data that are 35 days, 7 days, and 1 day old. These data are available with all communications methods supported by MADIS except for ldm.


Typical daily volume for all MADIS datasets can be seen here.


No restrictions. All observations are publicly accessible.

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Last updated 16 March 2017