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Former Daily Flags
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The following is a description of daily flags that were used prior to 1995. Historic pre 1995 daily data are flagged using these flags. Also included are descriptions for the flags and the criteria used to test data quality.
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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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One or more hourly solar radiation is severe.
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R
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Solar radiation is equal to or less than 0.0 or solar radiation is greater than 80 percent of daily incident solar radiation. Where incident solar radiation is the sum of hourly incident solar radiation divided by 24.
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S
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Solar radiation is equal to or greater than 4,000 Wm-2.
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2. Daily Average Net Radiation
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Flag
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Description
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H
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One or more hourly net radiation is severe.
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R
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Net radiation is equal to or less than -20 Wm-2 or net radiation is more than 60 percent of the daily incident solar radiation.
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S
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Net radiation is equal to or greater than 6,000 Wm-2.
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3. Daily Average Air Temperature
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Flag
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Description
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H
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One or more hourly air temperature is severe.
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R
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Average air temperature is far out of range of site specific historical range.
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Y
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Average air temperature is moderately out of range of site specific historical range.
Average air temperature falls under one of the following categories:
(1) Average air temperature is equal to or less than -50 oC or equal to or greater than 100 oC.
(2) Average air temperature is equal to the maximum temperature and to the minimum temperature.
(3) Maximum temperature is less than minimum temperature.
(4) Average air temperature is less than minimum temperature.
(5) Average air temperature is greater than maximum temperature.
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4. Daily Average Vapor Pressure
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Flag
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Description
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H
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One or more hourly vapor pressure is severe.
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R
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Average vapor pressure is equal to or less than 0 kPa; or average vapor pressure is equal to or greater than 4 kPa (40 mBars).
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S
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Average vapor pressure falls under one of the following categories:
(1) Average vapor pressure is equal to the maximum vapor pressure and to the minimum vapor pressure.
(2) Maximum vapor pressure is less than minimum vapor pressure.
(3) Average vapor pressure is less than minimum vapor pressure.
(4) Average vapor pressure is greater than maximum vapor pressure.
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5. Daily Average Wind Speed
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Flag
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Description
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H
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One or more hourly wind speed is severe.
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R
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Average wind speed is equal to or less than 0.45 ms-1, or average wind speed is greater than 25 ms-1.
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Y
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Average wind speed is equal to or less than 0.5 ms-1, or average wind speed is greater than 15 ms-1.
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S
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Average wind speed is equal to or less than 0.447 ms-1.
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6. 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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Precipitation is negative, equal to or greater than 300 mm, or is not a whole number.
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Y
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Precipitation is not equal to total hourly precipitation.
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7. Daily Reference Evapotranspiration
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Flag
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Description
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R
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One or more hourly evapotranspiration is not available or is flagged as R and could not be estimated.
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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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