Transcript Station Model Review

Station Model Review
Station Model Review
Station Model Review
Station Model Review
• Remember, dew point temperature can
NEVER be higher than the air
temperature. They can be the same if the
current weather is fog because fog means
you are walking into a cloud when you go
outside. For a cloud to form, either on the
ground or thousands of feet up, the air
temperature and dew point temperature
must be the same.
Station Model Review
• The closer together the air temperature
and dew point temperature the more
humid the air. This occurs when it is
cloudy and especially when the clouds are
precipitating. For example, totally cloudy
skies above may yield a surface air
temperature of 50 degrees and a dew
point of 42. If the current weather is
moderate snow, the air temperature may
be 27 degrees with a dew point of 25.
Station Model Review
• The wind direction stick points in the
direction of where the wind is coming
from.
• Wind speed is always on the right of the
wind direction stick. Not your right, the
sticks’ right. Long sticks are worth 10
mph, short sticks are 5 mph, and 50 mph
is represented by a triangular shaped flag.
Station Model Review
• Air pressure on a station model only
contains the last 3 digits of the air
pressure. A pressure of 995.0 mb is
written as 950 on the station model. A
pressure of 1032 is written as 320 on the
station model. If the tenth decimal place is
not given, assume it is a zero.
Station Model Review
• If a storm (low pressure) is moving towards you,
the air pressure is falling. If a storm is moving
away from you, the air pressure is rising. If a
storm is stationary or is at a point where it is
hard to tell if it is moving closer or farther away,
then the pressure is steady.
• If a high pressure is moving away from you, the
pressure is falling. If a high pressure is moving
towards you the pressure is rising. If the high
pressure is stationary then the pressure is
steady.
Pressure Rules
High Pressure: Wind Blows Outwards and
Clockwise in the Northern Hemisphere.
Low Pressure: Wind Blows Inwards and
Counterclockwise in the Northern
Hemisphere.
Pressure Rules
Extremely Rare Strong High: 1050 – 1086 (highest
recorded pressure ever) mb
Strong High: 1036 - 1050 mb
Moderate High: 1022 – 1036 mb
Weak High: 1010 – 1022 mb
Weak Low: 1002 – 1014 mb
Moderate Low: 988 – 1002 mb (nor’easters, tropical
storms, or category 1 hurricanes)
Strong Low: 960 – 988 mb (strong nor’easters or
category 1, 2, or 3 hurricanes)
Extremely Rare Strong Low: 870 (lowest recorded
pressure ever) – 960 mb (category 4 or 5 hurricanes)
Pressure Rules
Pressure Rules
Click Here for Pressure Converter if
Needed