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Current Daily Flags
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Following is a short description of the daily flags currently in use. Also included are descriptions of the flags and the criteria used to test data quality. It should be noted that the same flag can mean different things for different weather parameters.
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1. Daily Average Solar Radiation
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Flag
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Description
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H
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Any hourly solar radiation is flagged M, S, or Q.
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R
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Solar radiation is greater than historical maximum solar radiation (Rsc(d)) for that day or solar radiation is equal to or less than 0
The sinusoidal upper bound Rsc(d) was developed using maximum daily solar radiation value for each day of the year (d) over at least a 6 year period.
ao, a1, and a2 were determined by optimization.
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S
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Solar radiation is greater than 4,000 watts per square meter or less than -50 watts per square meter.
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2. Daily Average Net Radiation
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Flag
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Description
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R
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Net radiation is equal to or less than -20 watts per square meter or net radiation is more than 70 percent of daily 1 incident solar radiation.
1 Daily incident solar radiation is the sum of hourly daylight extraterrestrial radiation divided by 24.
Solar radiation, air temperature or vapor pressure is R.
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Y
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Solar radiation, air temperature or vapor pressure is Y.
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3. Daily Soil Temperature
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Flag
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Description
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R
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Soil temperature is far out of historical range (outside the 99.8% confidence interval).
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S
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Maximum, minimum and average soil temperatures are equal.
Average soil temperature is less than the minimum soil temperature or maximum soil temperature is less than the average soil temperature.
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Y
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Soil temperature is moderately out of historical range (outside the 96% confidence interval).
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4. Daily Air Temperature
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Flag
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Description
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R
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Air temperature is far out of historical range (outside the 99.8% confidence interval).
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S
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Average, maximum and minimum air temperatures are equal.
Average air temperature is less than minimum air temperature or maximum air temperature is less than average air temperature.
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Y
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Air temperature is moderately out of historical range (outside the 96% confidence interval).
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5. Daily Vapor Pressure
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Flag
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Description
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R
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Average vapor pressure is far out of historical range (outside the 99.8% confidence interval).
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S
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Average, maximum and minimum vapor pressure values are equal.
Average vapor pressure is less than minimum vapor pressure or maximum vapor pressure is less than average vapor pressure or minimum vapor pressure is greater than average vapor pressure.
Average vapor pressure is equal to or greater than 5 kPa.
Average vapor pressure is equal to or less than 0 kPa.
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Y
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Average vapor pressure is moderately out of historical range (outside the 96% confidence interval).
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6. Daily Average Wind Speed
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Flag
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Description
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I
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Average wind speed is equal to or less than 0.447 meters per second (1 mph).
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S
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Average wind speed is less than 0.
Average wind speed is greater than 25 meters per second (56 mph).
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R
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Average wind speed is far out of historical range or more than 3 standard deviations.
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Y
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Average wind speed is moderately out of historical range.
Average wind speed is moderately out of historical range (outside the 96% confidence interval).
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7. Daily Precipitation
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Flag
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Description
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H
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One or more hourly precipitation is severe.
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R
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Daily precipitation is greater than 300 mm (12 inches).
Daily precipitation is not equal to total hourly precipitation.
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S
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Daily precipitation is less than 0 mm.
Daily precipitation is greater than 350 mm (14 inches).
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8. Daily Reference Evapotranspiration
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Flag
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Description
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E
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Any hourly ETo is flagged E.
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R
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Any hourly ETo is flagged R or T.
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H
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Any hourly ETo is flagged M or A.
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9. Daily Average Relative Humidity
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Flag
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Description
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Q
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Average air temperature or average vapor pressure is flagged S.
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R
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Average air temperature or average vapor pressure is flagged R.
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Y
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Average air temperature or average vapor pressure is flagged Y.
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10. Daily Dew Point
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Flag
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Description
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I
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Average air temperature or average vapor pressure is flagged R.
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Q
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Average air temperature or average vapor pressure is flagged S.
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Y
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Average air temperature or average vapor pressure is flagged Y.
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11. Daily Wind Run
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Flag
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Description
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I
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Average wind speed is flagged I.
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Q
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Average wind speed is flagged S.
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R
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Average wind speed is flagged R.
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If you have questions, please contact the following:
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Bekele Temesgen
Department of Water Resources
Office of Water Use Efficiency
P.O. Box 942836
Sacramento, CA 94236-0001
temesgen@water.ca.gov
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Simon Eching
Department of Water Resources
Office of Water Use Efficiency
P.O. Box 942836
Sacramento, CA 94236-0001
seching@water.ca.gov
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