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Monthly QA Report

Quality Assurance

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
LAHO Soil Temperature at 10 cm under Bare Soil 2019-07-22 17:09:29 10cm bare soil temperature reports -7999 during warm part of day. Currently works when temperature below about 30C.
PERK Soil Temperature at 10 cm under Native Vegetation 2019-07-22 16:59:17 10cm sod temperature reports -7999 for all values when ground temperature exceeds about 31C. Replace sensor.
MAYR Station Battery Voltage 2019-07-22 16:36:34 Battery often does not charge on sunny days. When it does charge, charging is minimal compared to neighbors. Battery voltage dipped down to 11.0 V over the weekend. Problem started before lightning strike August 2018.
NRMN 229L Delta Temperature at 10cm under Bare Soils 2019-07-02 20:31:59 Soil moisture data much noisier than expected after lightning strike. Suspect either damaged sensor or damaged port on CE8.
SALL 229L Delta Temperature at 25 cm 2019-07-02 20:20:06 25-cm sensor reports -7999 for starting, final, and average soil temperature.
SEIL Soil Temperature at 10 cm under Native Vegetation 2019-07-02 18:50:16 TS10 has similar diurnal variation as TS05 and peaks before neighbors. Suspect sensor too shallow. Rebury.
ACME 229L Delta Temperature at 60 cm 2019-07-02 18:30:28 60-cm sensor not heating properly.
WAL2 Soil Temperature at 5 cm under Native Vegetation 2019-07-02 18:16:47 TS05 has similar diurnal variation as TS10. Check sensor depth and rebury if too deep.
GOOD Soil Temperature at 5 cm under Native Vegetation 2019-06-18 14:36:56 5cm sod sensor reports values much lower than expected for starting, final, and average soil temperature.
SLAP Soil Temperature at 10 cm under Bare Soil 2019-06-18 14:32:41 10cm bare sensor reports -7999 for starting, final, and average soil temp.
CLAY 229L Delta Temperature at 10cm under Sod 2019-06-18 14:28:29 Sensor not heating. Final temperature same as starting temperature. Average soil temperature is fine.