NOAA / GLERL / Real-Time Meteorological Observation Network

Metadata for NOAA/GLERL Alpena, MI Met Station

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Data for the Alpena Thunder Bay National Marine
Sanctuary & Underwater Preserve Meteorological Station:

LATITUDE:  45-03-35 N
LONGITUDE: 83-25-25 W
Site online: 04 Oct 2001, relocated to current location 27 Oct 2005

LOCATION:  On the Alpena Harbor Light
Site Elevation: 177.5 m above mean sea level
   Lake level above sea level:  176.0 m
   Base of tower above lake level: 1.5 m
Anemometer Height: 18 m above site elevation (raised from 17m on 7/5/06)
(lens is 12.8m above base, plus 1.5m, plus about 3.5m extension pole=18m)
Air Temp Height: 15 m above site elevation


NOTE: On 10/27/2005, the Alpena Met Station was moved to its new location on the Alpena Harbor Light.
The sensors were serviced at that time.
OLD LOCATION (for data prior to 10/27/2005):
   On the grounds of the Alpena water inlet plant located adjacent
   to the Alpena Thunder Bay National Marine Sanctuary & Underwater Preserve,
   45-02-47 N, 83-26-45 W. Site Elevation: 179.1m, Anemometer: 9.1m, Air Temp: 8.2m


Wind Sensor:  R.M. Young model 5103 Wind Monitor mounted on a 10' mast clamped to the light
deck rail.

Temperature Sensor:  CSI model 109 thermistor mounted in a naturally aspirated Gill type
radiation shield mounted about 3 feet below the Wind Monitor.

Processor:  CSI model CR200.  This units samples the sensors every 5 seconds and is set to
an averaging interval of 5 minutes.  For each 5-minute interval, a mean and max (gust) wind speed
are reported.  The peak wind is the max of all of the gusts during the hour.

The wind speed shown in the "18-Hour" table and in the "5-day" graph are from the 5-minute period
at the top of the hour.  The data listed in the link below the "18-Hour" table (today's 5-minute data)
and in the "3-hour" graph are every 5 minutes.

Power:  The system is run from a power supply on the AC line.

WebCam Image: See WebCam Details.

Scheme:  The CR200 communicates through a LinkSys wireless bridge to a base station site
located near the Thunder Bay Marine Sanctuary.

The system is interrogated by a PC from Ann Arbor running the CSI LoggerNet software
connected to the internet.

The data set consists of three 5 minute data ensembles.  Averaging and interrogation
intervals and the system program are adjustable remotely.  The system data rate is set to
1200 baud.

Data Line for file yyyymmdd.06t.txt: The data line is space delimited and consists of the following
columns in order from left to right.

1:Station ID, 6 (Alpena)
2:Year
3:Day of Year
4:Time, UTC
5:Average air temperature, Deg C
6:Wind Speed average m/s
7:Wind Speed maximum, m/s
8:Wind Direction, average, degrees from (0=north, 90=east)

Ron Muzzi
USDOC-NOAA-GLERL
Marine Instrumentation Laboratory
7-10-2006