MesoWest has been designed for use by National Weather Service meteorologists and other professionals for protection of life and property. Comments/suggestions for improvement may be sent to email@example.com.
MesoWest currently does have a few quality control methods that are applied to incoming observational data.
For all stations, quality control begins when the data are processed into MesoWest. These primarily consist of "range checks" which ensure any extraneous values are flagged as Suspect. Click here to view the maximum and minimum range check values associated with each variable.
The second step is a temporal consistency check, which restricts the temporal rate of change of each observation to a set of (other) TSP-specified tolerance limits. The tolerance limits are defined here. Currently, only the following variables are included in this check: TMPF, RELH, DWPF, ALTI, PMSL, SKNT, MTMP, MRH, MSKT, and TSOI.
The third step involves a four-hour persistence check. For each variable, a check is done that looks for consecutive readings of the same value for four straight hours (e.g. pressure remains at 29.95 inches of Hg for four straight hours). Any variables that meet this threshold are then flagged by the persistence check.
Finally, the next two steps involve additional statistical checks for stations with the available observations. First, a regression statistical check is conducted on available temperature, dew point, and pressure data. The process for this check is explained in more detail here. Second, a different statistical check is then conducted on available wind observations using the previous 3 days of data. This check essentially looks for stagnant wind observations (e.g. a long period of observations with the exact same wind direction, speed, or gust) which likely indicate issues with the wind data.
For stations that are part of the SNOTEL network, quality control flags of 'valid' or 'suspect' are provided to MesoWest for each variable reported at a station. These are also utilized by MesoWest.
The majority of MesoWest products utilize the following designations and color scale to identify the current state of data quality. Additional information on the flags and keys can be found here.
|Data has passed all Quality Control checks.|
|Some data has been flagged by the one of the statistical checks.
This data should be used with caution and examined by the user.
|Some data has not passed the any one of the first three checks.
It is recommended that this data not be used.