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Site description: Clearcut Nov 1986, natural regeneration
Latitude: 44-14-36 Longitude: 122- 8-30 Elevation (MSL): 1018 meters
Aspect: 260 degrees Slope: 12 degrees
Measurement period: 19950823 - Present
Comments:
Daily Variables:
23 Aug 1995 to Present : Daily precipitation (shelter gage)
03 Nov 2000 to Present: Daily precipitation (stand-alone gage)
Fine Resolution:
23 Aug 1995 to Present: 15 minute precipitation (shelter gage)
03 Nov 2000 to Present: 15 minute precipitation (stand-alone gage)
Status: Two raingages are now in operation.
The shelter gage is located on top of our station shelter
and heated through ducts from the shelter's propane heating
system. This gage has also improved catch over the more
traditionally heated raingages. However, it is protected only with
an alter wind shield. The stand-alone gage initiated 3 Nov 2000 has a
heated orifice and protective Valdais shield (fencing around gage).
A standard rain gage was operational 23 Aug 1995 to 26 Oct 2000.
Notes: Campbell data logger samples every 15 seconds
PROBE 01:
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Site description: Old growth opening, tight canopy
Latitude: 44-12-54 Longitude: 122-14-57 Elevation (MSL): 485 meters
Aspect: 355 degrees Slope: 5 degrees
Measurement period: 19571001 - Present
Comments:
Daily Variables:
01 Oct 1957 to Present : Daily precipitation
Fine Resolution Variables:
01 Oct 1957 to Present: 5 minute precipitation
Status: This is the longest precipitation record in the Andrews
Forest.
Notes: Data is collected weekly from a standard gage (total precip)
and the adjacent Universal recording gage (chart). Historically,
the charts were hand digitized on a daily basis, and adjusted to
the standard gage total. Subsequently, all charts have been
electronically digitized, and data can be interpolated at a
5 minute resolution. This high resolution data has also been
adjusted to the standard gage total.
The FORKS gage has been used to extend the CS2MET record
back to December, 1951.
PROBE 01:
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Site description: Old-growth opening/Road junction
Latitude: 44-15-51 Longitude: 122-10-26 Elevation (MSL): 922 meters
Aspect: 240 degrees Slope: 15 degrees
Measurement period: 19631001 - Present
Comments:
Daily Variables:
01 Oct 1964 to Present : Daily precipitation
18 Sep1964 to Present : Standard raingage (3 week to monthly checks)
Fine Resolution Variables:
01 Oct 1984 to 05 Aug 1992: 15 minute precipitation (adjusted to standard)
05 Aug 1992 to Present : 5 minute precipitation (not adjusted)
Gage height: 410 cm
Status: A standard rain gage has always been maintained along with
an accompanying recording rain gage. Until Aug 1992, all records
were adjusted to totals recorded from the standard rain gage. Since
Aug 1992, both the adjusted (PPTH1501) and unadjusted (PPTH1502)
recording gage records are being maintained.
The daily record for the standard rain gage record is probe 1 and has been
determined using prorating techniques with the listed recording gages.
Probe 1 (record is adjusted to the nearby standard gage):
Q-12 Recording Gage (chart) established 01 Oct 1964.
Heated Tipping Bucket (chart) replaces Q-12 on 01 Oct 1974.
A-35 Recording Gage (chart) replaces Tipping Bucket on 01 Apr 1984.
Pressure transducer with CR10 data logger replaces A-35 on 5 Aug 1992 to present.
Probe 2 (electronic high resolution record is not adjusted):
Pressure transducer with CR-10 (electronic) replaces A-35
on 30 Sep 1992, but A-35 is still maintained as a backup.
Notes: Historically, the charts were hand digitized on a daily
basis, and the daily record adjusted to the standard gage total
(prorating technique). Beginning 01 Oct 1984, all charts were
electronically digitized, and the daily record was adjusted to
the standard gage total (prorating technique). Beginning 01 Oct 1992,
electronic digitizing of charts is stopped, except to fill gaps
in the CR-10 record. The daily standard gage record is created
by prorating the total using the CR-10 record. When recording
gage malfunctions occurred, CS2MET was used to prorate the
standard gage total to obtain a daily record.
01 Oct 1964 to 01 Oct 1974
Data was collected monthly (approx.) from the standard gage
(total precip) and the adjacent Q-12 recording gage (chart).
The standard gage had a 7.75" orifice diameter.
On 10 Oct 1973, gage was replaced with an 8" diameter standard gage.
Recording gage sits atop a steel tower.
01 Oct 1974 to 01 Apr 1984
Data was collected every 3 weeks (approx.) from the standard gage
(total precip) and the adjacent Tipping Bucket recording gage
(chart). Tipping Bucket Gage replaced with a Heated recording
gage (A-35 water level recorder) on 01 Apr 1984. The gage was
troublesome in the months before replacement.
01 Apr 1984 to 30 Sep 1992
Data was collected every 3 weeks (approx.) from the standard gage
(total precip) and the adjacent A-35 recording gage (chart).
Historically, the charts were hand digitized on a daily basis and
adjusted to the standard gage total. Subsequently, the charts
were electronically digitized, and the high resolution data was
adjusted to the standard rain gage.
In March, 1984, an enclosure is built below the tower to house instruments.
In July, 1986, a new shelter is built to house the rain gage and replaces
the tower.
30 Sep 1992 to Present
Data is collected every 3 weeks (approx.) from the standard gage,
and the total is prorated using the adjacent CR-10 recorder on a
daily basis. The A-35 recording chart acts as a backup.
High resolution data collected from the CR10 is also maintained
and not adjusted to the standard rain gage.
CR10 with pressure transducer, samples every 10 seconds.
PROBE 01:
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Site description: Maintained clearing
Latitude: 44-12-43 Longitude: 122-15-21 Elevation (MSL): 430 meters
Aspect: - degrees Slope: 0 degrees
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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Site description: Clearcut 1965
Latitude: 44-12-26 Longitude: 122- 7-10 Elevation (MSL): 1294 meters
Aspect: 72 degrees Slope: 13 degrees
Measurement period: 19941001 - Present
Comments:
Daily Variables:
01 Oct 1994 to Present : Daily precipitation
Fine Resolution:
01 Oct 1994 to Present: 5 minute precipitation
Status: Two gages have been installed: a stand-alone gage with a
Valdais shield and a shelter gage. The orifice of the stand alone
gage is heated by a thermistatically controlled propane heater.
This heated gage with the very significant Valdais shielding fence
has dramatically improved our snow catch and prevented snow
bridging over the gage. The shelter gage is located on top of our
station shelter and heated through ducts from the shelter's propane
heating system. This gage has also improved catch over the more
traditionally heated raingages. However, it is protected only with an
alter wind shield and catches less than the stand-alone. A standard
raingage was operational from 18 Sep 1995 to 21 Sep 2000.
Notes: CR21X, Samples every 15 seconds
PROBE 01:
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Site description: Clearcut 1985?
Latitude: 44-16-18 Longitude: 122- 8-58 Elevation (MSL): 1273 meters
Aspect: 180 degrees Slope: 23 degrees
Measurement period: 19870616 - Present
Comments:
Daily Variables:
16 Jun 1987 to Present : Daily precipitation
Fine Resolution:
25 Oct 1990 to 19 Aug 1993: Hourly Precipitation
19 Aug 1993 to Present: 5 minute precipitation
Status: New stand alone rain gage in the sheltered meadow above
the VANMET clearcut site was established in November, 1998.
The original gage in the clearcut was removed in Sep 2001.
Original gage has suffered immensely from its openly exposed
siting on a high elevation clearcut. Heavy snow and inadequate
wind shielding have been major problems. Gage is heated
with propane heater controlled by CR21X thermistor, and does
employ an altar shield. A standard raingage was operational at
the clearcut site from 2 Feb 1994 to 26 Oct 2000. A standard
raingage was operational at the meadow site from 2 Feb 1994
to 26 Oct 2000. A standard raingage was operational near the road
below the clearcut site from 16 Feb 1994 to 21 Jun 1995.
Notes: Original gage employs a slanted orifice where slant is equal
to the site's slope. Problems with leakage and gage evaporation
due to overheating have compromised much of the record.
Gage was tipped over and subsequently rebuilt in Oct 1993.
CR21X, Samples every 15 seconds
PROBE 01: