 
General Barometer Information
The center knob
on the barometer's front moves the set hand. Use it to mark or place
over the location of the black inside hand at the time you set the
barometer. This outside set hand will then serve as a reference marker
so you can easily see if pressure is rising, falling or steady.
Your
barometer's reading may not exactly coincide with a broadcast due to
difference in location, time of reading and other factors.
To set the pressure reading to your location turn the small
brass set screw located on the backside of the movement. Use a
small screwdriver or sewing machine screwdriver to adjust the
indicator needle to your correct pressure reading. Turn it slow
while facing the dial indicator hand. Keep in
mind that your barometer reads 12-24 hours in advance for pressure
changes and rain or shine.
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The
chart below illustrates how to interpret your
barometer's inches of mercury reading. This provides a
reasonably accurate forecast for the next 12 to 24
hours.
|
Barometric Reading |
- Forecast |
|
Over 30.20" |
|
Rising or steady |
- Continued fair |
|
Slowing falling |
- Fair |
|
Rapidly falling |
- Cloudy, Warmer |
|
|
|
29.80" to 30.20" |
|
Rising or steady |
- Same as present |
|
Slowing falling |
- Little change |
|
Rapidly falling |
- Precipitation likely |
|
|
|
Under 29.80" |
|
Rising or steady |
- Clearing, cooler |
|
Slowing falling |
- Precipitation |
|
Rapid falling |
- Storm |
|
The words,
"stormy", "rain", "change", "fair", "dry", etc. are traditional
carry overs from the days when weather forecasting was less of a
science, and should not be used in predicting weather changes.
Do not expect
large changes in the position of the indicating hand. Normal daily
changes may be in a range of .02 to .10 of an inch on the barometer
scale. Changes in pressure readings will be of greater magnitude in
winter months than in summer and will also depend on location and
altitude.

Moore Clocks 123 Camelot Crescent Yorktown, VA
23693 1-877-286-6313
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