Weather Maps

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Much information is needed to interpret what is
happening with the atmosphere.
Need to condense this information in a small space
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(No Transcript)
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Station Model Allows the data to be plotted in a
condensed and usable format
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Location of the station on the map.
The name of the location or airport abbreviation
might be given nearby.
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Temperature information in degrees Fahrenheit.
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Dew Point Temperature in degrees Fahrenheit.
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Wind direction A staff is rotated around the
station.
Remember, winds are identified as the direction
FROM which they come. This would be a west
northwest wind or about 290º.
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Wind Speed Attached to the staff are symbols for
speed.
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The coding for the wind speed symbols can be
generalized as
half staff about 5 knots
full staff about 10 knots
these are additive for the total amounts three
full staffs30 knots
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Current Barometric Pressure
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Barometric Pressure is VERY important!
average barometric pressure at sea level is
1013.25 mb.
current barometric pressure is reported to the
nearest TENTH
BUT, they dont want to waste space
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average barometric pressure at sea level is
1013.25 mb.
barometric pressure varies around this value
about 30 1043
somewhat higher
1013.3
somewhat lower
- about 30 983
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average barometric pressure at sea level is
1013.25 mb.
barometric pressure varies around this value
they do not PRINT the beginning number or numbers
1013.3
---- 13.3
they, also, do not PRINT the decimal point, but
report to the nearest TENTH
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From the three numbers, you must INTERPRET
whether the preceding value is 10 or 9 Which
would make the value most realistic?
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add the decimal point and then consider which, a
10 or a 9 places the value NEAREST to the average
pressure of 1013.25 mb.
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(1013.3)
What is the pressure?
084
08.4
1008.4
962
96.2
996.2
28.1
1028.1
281
987.5
875
87.5
322
32.2
1032.2
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Not only is the pressure itself important, but so
is the way the pressure has been changing. So,
more information may be given and must be coded.
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How has the barometer been changing?
it is higher now than in the past - it is lower
now than in the past
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How much the pressure has changed
the amount of change in the past three
hours again, reported in TENTHS without the
decimal
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What has the pressure been doing? Shown
diagrammatically
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Total amount of cloud
graphic depiction of percentage of the sky
covered by clouds
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about 75
no clouds
about 25
completely overcast
about 50
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What is the present weather?
The current weather is very important. A
detailed set of symbols provides weather
descriptions.
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Samples of present weather symbols.
rain
fog

snow
haze
slight rain showers
thunderstorm
,
drizzle
.
ice or snow pellets
lightning
cloud development not observed
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The visibility is especially important for pilots.
Visibility is given in miles and fractions
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The past weather uses symbols.
,

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The amount of precipitation
amount
Amount of precipitation is plotted in inches to
the nearest hundredth of an inch.