DQRID : D020703.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/20/1998010103/31/20012359Suspect
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Subject:
NSA/ORG/C1 - Optical Rain Gauge incorrect at very low temperatures
DataStreams:nsaorgC1.a1
Description:
The ORG reports precipitation rates that are more than 2 orders of
magnitude greater than those reported by the present weather sensor
when the temperature drops below -25 C.  Examples of this error can
be seen in the data for January 11-13, 2000, however the problem is
not isolated to these days.

A drift occurs when temps are in the range of -25 C to -40 C that
exceeds the maximum drift allowed/expected for the instrument.  The
drift is then reported as precipitation.

The manufacturer of the instrument has not yet been able to identify a
fix for the problem.
Suggestions: 
Do not use precipitation data from the ORG when
temperatures drop below -25 C.
Measurements:nsaorgC1.a1:
  • precip_serial_error
  • precip_daily_accum
  • precip_NWS_code
  • precip_rate
  • precip_no_data_error
  • precip_read_timeout_error
  • precip_out_of_range_error
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