The Oklahoma Mesonet’s quality-assurance (QA) consists of four principal components:
1) laboratory calibration,
2) on-site intercomparison,
3) automated QA, and
4) manual QA.
In the instrument laboratory, all sensors are calibrated to validate or improve upon factory calibrations.
On an annual basis, the accuracy of several types of sensors in the field is verified through comparison to calibrated reference sensors housed in a portable system.
To make a first pass through the 640,000+ observations that are received at the Mesonet each day, automated QA software includes numerous algorithms to evaluate the data received from remote stations.
Finally, the Mesonet’s QA meteorologists employ numerous manual techniques to complement automated QA including analysis of monthly statistics to detect sensor drift or bias (click on a month and year to the left to download a PDF version of a Monthly Report). In addition to detecting problematic sensors, the QA meteorologists trace the true start time of each problem so that appropriate data can be manually flagged as erroneous. The QA meteorologists are responsible for communicating problems to, and coordinating with, appropriate field technicians to ensure proper resolution (see a list of the current outstanding tickets below).
Current Trouble Tickets in the Oklahoma Mesonet
(For questions regarding these tickets, contact )
|Station||Variable||Date Reported||Problem Description|
|HOOK||Air Temperature at 1.5 m||2019-03-15 21:55:16||TAIR higher than expected during the day, and cooler than expected at night. Suspect exposed sensor due to possible damage to radiation shield.|
|SEMI||Rain since midnight UTC at 0.6m||2019-03-13 18:22:38||Primary gauge sometimes misses tips during rainfall. Check all connections for damage and verify transorb diode is pulled away from gauge body. If no problem found, swap physical locations of rain gauges.|
|SALL||Rain since midnight UTC at 0.6m||2019-03-13 18:18:21||Primary gauge sometimes misses tips during rainfall. Check all connections for damage and verify transorb diode is pulled away from gauge body.|
|OKCE||229L Delta Temperature at 5 cm||2019-03-07 21:51:28||5 cm under sod reports either -7999 or errantly high value for starting, final, and average temp.|
|HASK||Wind Speed at 2 m||2019-03-07 21:45:18||2m wind speed reports 0 when 10m wind up to 3m/s regardless of wind direction. Replace sensor.|