Instrument : Surface and Tower Meteorological Instrumentation at NSA (METTWR)

Instrument Categories
Surface Meteorology

Picture of the Surface meteorological measurements from tower (METTWR)

EDITOR'S NOTE: Current data can be found in the Surface Meteorological Instrumentation (MET) and Facility-specific Multilevel Meteorological Instrumentation (TWR) datastreams; some historical data will remain available under the retired METTWR and METTIPTWR.

General Overview

Surface and Tower Meteorological Instrumentation at NSA (METTWR) use mainly conventional in situ sensors to measure wind speed, wind direction, air temperature, dew point, and humidity mounted on either a 10-m or a 40-m tower. It also obtains barometric pressure, visibility, and precipitation data from sensors at or near the base of the towers. In addition, Chilled Mirror Hygrometers are located on the towers for comparison purposes.

Output Datastreams

  • cmh : Chilled Mirror Dew Point Hygrometer
  • mettiptwr : Ten Meter Tower: meteorological data, 2 & 6 m, 1-min avg
  • mettwr : Forty Meter Tower: meteorological data, 2, 10, 20, & 40 m, 1-min avg
  • org : Optical Rain Gauge measurements: precipitation rate and accumulation
  • pws : Present weather sensor, 1-min avg
  • snodep : Snow depth

Primary Measurements

The following measurements are those considered scientifically relevant.


North Slope Alaska
NSAC1 Browse DataCentral Facility, Barrow AK retired
NSAC2 Browse DataCentral Facility, Atqasuk AK retired
 retired = Originating instrument has been retired at this location


Jenni Kyrouac
Argonne National Laboratory

David Cook
Argonne National Laboratory
(630) 252-5840