Table 3-2. Data Elements in the NSRDB Synoptic Format
(For all except the first record of each file)
Field
Position
ElementValuesDefinition
002 - 012
002 - 003
005 - 006
008 - 009
011 - 012
Local Standard Time
Year
Month
Day
Hour

61 - 90
1 - 12
1 - 31
1 - 24

Year of observation
Month of observation
Day of month
Hour of day in local standard time
014 - 017



Extraterrestrial Horizontal
Radiation


0 - 1415



Amount of solar radiation in Wh/m2 received on
a horizontal surface at the top of the atmosphere
during the 60 minutes preceding the hour
indicated.
019 - 022



Extraterrestrial Direct
Normal Radiation


0 - 1415



Amount of solar radiation in Wh/m2 received on
a surface normal to the sun at the top of the
atmosphere during the 60 minutes preceding the
hour indicated.
024 - 030
024 - 027
029
030
Global Horizontal Radiation
Data Value
Flag for Data Source
Flag for Data Uncertainty

0 - 1415
A - H, ?
0 - 9
Total amount of direct and diffuse solar
radiation in Wh/m2 received on a horizontal
surface during the 60 minutes preceding the
hour indicated.     9999 = missing data.
032 - 038
032 - 035
037
038
Direct Normal Radiation
Data Value
Flag for Data Source
Flag for Data Uncertainty

0 - 1415
A - H, ?
0 - 9
Amount of solar radiation in Wh/m2 received
within a 5.7o field of view centered on the sun,
during the 60 minutes preceding the hour
indicated.     9999 = missing data.
040 - 046
040 - 043
045
046

Diffuse Horizontal Radiation
Data Value
Flag for Data Source
Flag for Data Uncertainty


0 - 1415
A - H, ?
0 - 9

Amount of solar radiation in Wh/m2 received
from the sky (excluding the solar disk) on a
horizontal surface, during the 60 minutes
preceding the hour indicated.
9999 = missing data.
048 - 049

Total Sky Cover

0 - 10

Amount of sky dome (in tenths) covered by
clouds.       99 = missing data.
051 - 052


Opaque Sky Cover


0 - 10


Amount of sky dome (in tenths) covered by
clouds that prevent observing the sky or higher
cloud layers.       99 = missing data.
054 - 058

Dry Bulb Temperature

-70.0 to 60.0

Dry bulb temperature in oC.
9999. = missing data.
060 - 064

Dew Point Temperature

-70.0 to 60.0

Dew point temperature in oC.
9999. = missing data.
066 - 068

Relative Humidity

0 - 100

Relative humidity in percent.
999 = missing data.
070 - 073

Atmospheric Pressure

700 - 1100

Atmospheric pressure in millibars.
9999 = missing data.
075 - 077


Wind Direction


0 - 360


Wind direction in degrees.
(N = 0 or 360, E = 90, S = 180, W = 270 )
999 = missing data.
078 - 082 Wind Speed 0.0 - 99.0 Wind speed in m/s. 9999. = missing data.
083 - 088


Visibility


0.0 - 160.9


Horizontal visibility in kilometers.
777.7 = unlimited visibility.
99999.= missing data.
089 - 094



Ceiling Height



0 - 30450



Ceiling height in meters.
77777 = unlimited ceiling height.
88888 = cirroform.
999999 = missing data.
096 - 105


Present Weather


See
Appendix D

Present weather conditions denoted by a ten digit number.
See Appendix D for an explanation of weather elements
and parameters.
106 - 109

Precipitable
Water
0 -100

Precipitable water in millimeters.
9999 = missing data.
110 - 115


Broadband
Aerosol Optical
Depth
0.0 - 0.900


Broadband aerosol optical depth (broadband turbidity ) on
the day indicated.
99999. = missing data.
116 - 119

Snow Depth

0 - 100

Snow depth in centimeters on the day indicated.
9999 = missing data.
120 - 122


Days Since Last
Snowfall

0 - 88


Number of days since last snowfall.
88 = 88 or greater days.
999 = missing data.
FORTRAN Format
(4(1X,I2),2(lX,I4),3(1X,I4,lX,Al,I1),2(1X,I2),2(1X,F5.1),1X,I3,1X,I4,lX,I3,F5.1,F6.1,I6,1X,10I1,I4,
F6.3,I4,3I3)

Notes: With the exception of solar radiation elements, broadband aerosol optical depths, snow
         depth,and days since last snowfall, all values were observed or measured at the hour
         indicated. Daily values of broadband aerosol optical depth were estimated as
         described in Section 5.2.3.


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