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
CARL 229L Delta Temperature at 5 cm 2017-06-27 20:14:22 5cm soil moisture has slower than expected response to soil moisture. Replace sensor.
BUFF 229L Delta Temperature at 10cm under Bare Soils 2017-06-23 14:40:51 Soil moisture at 10cm under bare stopped heating. Soil temperature at 10cm under bare is fine.
NEWK 229L Delta Temperature at 10cm under Bare Soils 2017-06-22 19:30:01 10cm bare soil temperature and moisture sometimes report out-of-range or -7999. Problem typically starts early afternoon and lasts until couple hours after sunset. Does not happen every day.
TALI 229L Delta Temperature at 10cm under Bare Soils 2017-06-19 18:42:17 Soil moisture and soil temperature at 10cm under bare is reporting -7999.
BURB 229L Delta Temperature at 5 cm 2017-06-12 15:03:03 Soil moisture and soil temperature at 5cm is reporting -7999.
HECT 229L Delta Temperature at 10cm under Bare Soils 2017-05-26 19:08:29 10cm bare soil moisture final temperature sometimes 0.5-1C higher than expected. Causes errant spikes in fractional water. Usually only affects 1 observation per day. Data flagged as needed.
FAIR 229L Delta Temperature at 25 cm 2017-05-12 16:04:37 Soil moisture saturated valued exceeds allowed maximum. Unable to adjust coefficients to fit both historic and recent observations. Replace sensor.
PAWN Soil Temperature at 10 cm under Bare Soil 2017-05-08 20:08:13 10cm bare soil temperature has less diurnal variation than neighbors and 10cm sod. Check sensor depth and rebury.
TULN Soil Temperature at 5 cm under Native Vegetation 2017-05-05 21:13:18 Soil temperature at 5cm has a similar diurnal variation to soil temperature at 10cm. Suspect soil temperature at 5cm is too deep.
NINN 229L Delta Temperature at 5 cm 2016-11-28 15:42:22 Final temperature for 5cm under sod increased from 15C to 28C. Starting temperature is reporting around 13C.