Site description: Maintained clearing
Latitude: 44-12-43 Longitude: 122-15-21 Elevation (MSL): 430 meters
Aspect: - degrees Slope: 0 degrees
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Measurement period:: 19720510 - Present
Comments:
Daily Variables:
9 May 1972 to 13 Sep 1994:
Mean, max, min daily (midnight to midnight) temperature
Mean, max, min daytime temperature
Mean, max, min nighttime temperature
Time of max, time of min for daily, daytime, nighttime
13 Sep 1994 to Present:
Mean, max, min daily (midnight to midnight) temperature
Daily time of max, time of min
Fine Resolution Variables:
9 May 1972 to 13 Sep 1994:
Mean hourly air temperature
13 Sep 1994 to Present:
15 minute mean air temperature
Sensor height: 9 May 1972 to 23 Jun 2004: 150 cm cotton shelter (probe 05)
13 Sep 1994 to 25 Jun 2004: 150,250,350,450 cm on tower (probes 04, 03, 02, 01, respectively)
26 Jun 2004 to Present: probes at 150 or 450 cm on tower with different shields
Aspirated shield and sensor replaces cotton shelter sensor
Notes: Before 6 Jul 1988, min and max temperatures were hourly averages,
and the hour with the highest (or lowest ) average temperature was time of max (or min).
After 6 Jul 1988, min and max temperatures are instantaneous, and the time of min and max are
accurate.
From 06 Jul 1988 to 30 May 2000, the original probe at 150 cm height located in a Cotton Region
Shelter (probe 5) was used in dew point and vapor pressure deficit calculations.
In Sept 1994, an array of 4 new probes were added to the station tower at 150,250,350,450 cm
heights, in addition to the Cotton Shelter probe.
Beginning on 06 Jul 1998, the 150cm probe on the tower is also used to calculate dew point and
water vapor pressure deficit. On 30 May 2000, use of the 150 cm Cotton Shelter probe to calculate
dew point and water vapor pressure deficit was discontinued and replaced with the use of the 450 cm
probe on the tower.
In June 2000, probes were repositioned to 150 or 450 cm on the tower and a side by side experiment
of various sheilds was installed.
In June 2004, the experiment was deemed finished and the probes were permanently repositioned on
the tower at 150 or 450 cm with the different shields.
Daytime and nighttime calculations were discontinued on 13 Sep 1994.
CR21X samples every 10 seconds beginning 6 Jul 1988.
PROBE 01:
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DEW POINT TEMPERATURE (PRIMET)
Measurement period:: 19720510 - Present
Comments:
Daily Variables:
09 May 1972 to 13 Sep 1994:
Mean, max, min daily (midnight to midnight) dew point temperature
Mean, max, min daytime dewpoint temperature
Mean, max, min nighttime dewpoint temperature
Time of max, time of min for daily, daytime, nighttime
13 Sep 1994 to Present:
Mean, max, min daily (midnight to midnight) dew point temperature
Daily time of max, time of min
Fine Resolution Variables:
10 May 1972 to Present:
Mean hourly dew point temperature
Sensor height: 09 May 1972 to 30 May 2000 : 150 cm cotton shelter (probe 05)
04 Jun 1998 to present: 150 cm on tower (probe 04)
30 May 2000 to present: 450 cm on tower (probe 01)
Notes: Before 06 Jul 1988, min and max temperatures were hourly averages,
and the hour with the highest (or lowest ) average temperature was time of max (or min).
After 06 Jul 1988, min and max temperatures are instantaneous, and the
time of min and max are accurate.
Before 06 Jul 1988 a lithium-chloride hygrometer is used. Problems
are noted before 1979. After 06 Jul 1988, dew point is calculated from
temperature and relative himidity sensors located in the 150 cm
cotton shelter every 10 seconds (in millibars). Since 04 Jun 1998, an additional probe at 150 cm
on the tower was used to calculate dew point. On 30 May 2000, use of the 150 cm cotton shelter
probe to calculate dew point was discontinued and replaced with use of the 450 cm probe on the
tower.
Daytime and nighttime calculations are discontinued 13 Sep 1994.
PROBE 01:
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Measurement period:: 19790101 - Present
Comments:
Daily Variables:
06 Mar 1979 to Present : Daily precipitation (tipping bucket)
24 Jan 2002 to Present: Daily precipitation (stand-alone)
Fine Resolution Variables:
06 Mar 1979 to 13 Sep 1994 : Hourly precipitation
13 Sep 1994 to Present: 15 minute precipitation
24 Jan 2002 to Present: 15 minute precipitation (stand-alone)
Status: Tipping bucket gage at gage is at height 100 cm. Stand-alone
gage also operational. Data logger samples every 15 seconds.
Notes: Gage actually established 06 Mar 1979. Early 1979 values
and missing values are filled in with WS#2 Climatic Station
and NADP Universal rain gages. Much of the first year is
missing, and the good record begins 01 Jan 1980.
The tipping bucket record is somewhat artificial at 5 minute
resolution, especially in light rain situations where the gage
does not tip in every 5 minute segment. 15 minute resolution
is probably more realistic. The stand-alone style raingage was
installed in January 2002 along with the tipping bucket.
PROBE 01:
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Measurement period:: 19880706 - Present
Comments:
Daily Variables:
06 Jul 1988 to 13 Sep 1994:
Mean, max, min daily (midnight to midnight) relative humidity
Mean, max, min daytime relative humidity
Mean, max, min nighttime relative humidity
Time of max, time of min for daily, daytime, nighttime
13 Sep 1994 to Present:
Mean, max, min daily (midnight to midnight) relative humidity
Daily time of max, time of min
Fine Resolution Variables:
06 Jul 1988 to Present:
Hourly relative humidity
Sensor height: 06 Jul 1988 to 30 May 2000 : 150 cm cotton shelter (probe 05)
04 Jun 1998 to present: 150 cm on tower (probe 04)
30 May 2000 to present: 450 cm on tower (probe 01)
Notes: CR21X, Samples every 15 seconds. After 13 Sep 1994 daytime
and nighttime calculations were discontinued.
Both probes are used to calculate vapor pressure deficit.
PROBE 01:
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SNOW MOISTURE AND DEPTH (PRIMET)
Measurement period:: 19990210 - Present
Comments:
Fine Resolution Variables:
10 Feb 1999 to Present:
5 minute snow moisture in water equivalence
08 Jun 1998 to Present:
5 minute snow depth
Notes: The high resolution 5 minute data file is reduced to
eliminate points when both snow depth and moisture are unchanging.
Installed June, 1998. Non-functioning valve prevented proper operation
of snow pillow until Feb 1999.
CR10 samples every 15 seconds.
PROBE 01:
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Measurement period:: 19980604 - Present
Comments:
Daily Variables:
04 Jun 1998 to Present:
Mean, max, min soil moisture
Time of max, time of min
Sensor depth: 10,20,50,100
Notes: Water content reflectometer. Daily values only.
PROBE 01:
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SOIL MOISTURE POTENTIAL (PRIMET)
Measurement period:: 19880706 - 20000523
Comments:
Daily Variables:
06 Jul 1988 to 27 Mar 1990:
Mean, max, min daily (midnight to midnight) soil moisture potential
Mean, max, min daytime soil moisture potential
Mean, max, min nighttime soil moisture potential
Time of max, time of min for daily, daytime, nighttime
28 Oct 1994 to 23 May 2000:
Mean, max, min soil moisture potential
Time of max, time of min
Fine Resolution Variables:
06 Jul 1988 to 27 Mar 1990:
Mean hourly soil moisture potential
Sensor depth: 20 cm (until 941028)
10,20,50,100 (after 941028)
Notes: Gypsum block measurements discontinued 27 Mar 1990, and restarted
on 28 Oct 1994 on a daily basis only. Water content reflectometers to measure soil moisture were
added on 04 Jun 1998 and subsequently, gypsum block measurements were terminated on 23 May 2000.
PROBE 01:
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Measurement period:: 19880706 - Present
Comments:
Daily Variables:
06 Jul 1988 to 13 Sep 1994:
Mean, max, min daily (midnight to midnight) soil temperature
Mean, max, min daytime soil temperature
Mean, max, min nighttime soil temperature
Time of max, time of min for daily, daytime, nighttime
13 Sep 1994 to Present:
Mean, max, min daily (midnight to midnight) soil temperature
Daily time of max, time of min
Fine Resolution Variables:
06 Jul 1988 to Present:
Mean hourly soil temperature
Sensor depth: 20 (until 13 Sep 1994)
10,20,50,100 (after 13 Sep 1994)
Notes: In Sept , 1994, an array of temperature probes are
established 10, 20, 50, 100 cm depths. After 13 Sep 1994,
daytime and nighttime calculation are discontinued.
On February 22, 2001 pvc shields for all 4 probes were removed.
PROBE 01:
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Measurement period:: 19720510 - Present
Comments:
Daily Variables:
10 May 1972 to Present:
Total and max daily incoming solar radiation
Time of max
Fine Resolution Variables:
10 May 1972 to 13 Sep 1994:
Total incoming solar radiation in megaJoules per meter squared per hour
13 Sep 1994 to Present:
Total incoming solar radiation in megaJoules per meter squared per 15 minutes
Sensor height: 10 May 1972 to 01 Jan 1980 500 cm
01 Jan 1980 to Present 100 cm
Notes: Max solar radiation is maximum rate of incoming solar radiation as
watts per meter squared. All MAXSOLAR values were originally collected as
Langleys from 10 May 1972 to 8 May 2007.
TOTSOLAR values, originally collected as total Langleys over the given time interval
from 10 May 1972 to 8 May 2007, were converted to megaJoules per meter squared.
Conversions occurred in Nov 2009.
Before 07 Jul 1988, max solar radiation rate (now watts per meter squared)
was originally collected as total langleys per minute, but was based on the hour with
maximum total langleys divided by 60. The time of maximum is the hour with the
highest total incoming solar radiation.
After 07 Jul 1988, max solar radiation rate (now watts per meter squared)
was originally based on total langleys per minute, the maximum is based on
one minute, and the time of max is accurate to the minute.
Much of the incoming solar radiation data from the 1970's is estimated.
PROBE 01:
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WATER VAPOR PRESSURE DEFICIT (PRIMET)
Measurement period:: 19880706 - Present
Comments:
Daily Variables:
06 Jul 1988 to 13 Sep 1994:
Mean, max, min daily (midnight to midnight) vapor pressure deficit
Mean, max, min daytime vapor pressure deficit
Mean, max, min nighttime vapor pressure deficit
Time of max, time of min for daily, daytime, nighttime
13 Sep 1994 to Present:
Mean, max, min daily (midnight to midnight) vapor pressure deficit
Daily time of max, time of min
Fine Resolution Variables:
06 Jul 1988 to Present:
Mean hourly vapor pressure deficit
Sensor height: 06 Jul 1988 to 30 May 2000 : 150 cm cotton shelter (probe 05)
04 Jun 1998 to present: 150 cm on tower (probe 04)
30 May 2000 to present: 450 cm on tower (probe 01)
Notes: After 06 Jul 1988, water vapor pressure deficit is calculated from air temperature
and relative humidity sensors located in the 150 cm cotton shelter every 15 seconds (in
millibars). Since 04 Jun 1998, an additional probe at 150 cm on the tower was used to calculate
water vapor pressure deficit. On 30 May 2000, use of the 150 cm cotton shelter probe to calculate
water vapor pressure deficit was discontinued and replaced with the use of the 450 cm probe on the
tower .
Daytime and nighttime calculations are discontinued 13 Sep 1994.
PROBE 01:
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WIND SPEED AND DIRECTION (PRIMET)
Measurement period:: 19730522 - Present
Comments:
Daily Variables:
22 May 1973 to 06 Jul 1988:
Daily (midnight to midnight), daytime, nighttime values:
Mean and max wind speed
Time of max wind speed
06 Jul 1988 to 13 Sep 1994:
Daily (midnight to midnight), daytime, nighttime values:
Mean and max wind speed, resultant mean wind vector magnitude
Time of max wind speed
Resultant mean daily wind vector direction, standard deviation,
Daily wind direction vector components (Wind Rose).
13 Sep 1994 to Present:
Daily (midnight to midnight) values:
Mean and max wind speed, resultant mean wind vector magnitude
Time of max wind speed
Resultant mean daily wind vector direction, standard deviation,
Daily wind direction vector components (Wind Rose).
Fine Resolution Variables:
22 May 1973 to 12 Mar 1992:
Hourly mean wind speed
12 Mar 1992 to Present:
Hourly mean wind speed, resultant mean wind vector magnitude
13 Sep 1994 to Present:
Resultant mean hourly wind vector direction, standard deviation
Sensor height: 22 May 1973 to 25 Nov 1975 500 cm
28 Dec 1979 to 01 Jan 1989 1200 cm
01 Jan 1989 to Present 1000 cm
Notes: Before 06 Jul 1988, max wind speed was an hourly average,
and the hour with the highest average was the time of max .
After 06 Jul 1988, max wind speed is instantaneous,
and the time of max is accurate to the minute.
After Sept 1994, daytime and nighttime calculations were discontinued.
CR21X samples every 15 seconds.
PROBE 01: