Name ___________________________________
Date _______________
Class Period _____
Instructor _____________
Lab Period ______
5 points
Station Models
Data Sheet
Fill in the following table, decoding and encoding in the appropriate spaces.
Decode
Encode
1
275
1
998.9 mb
2
795
2
1027.6 mb
3
000
3
1002.1 mb
4
748
4
884.2 mb
Wind Flags
1.
3.
2.
4.
SHOW UNITS Fill out the chart based on the station models.
Information
Dry Bulb
(Air Temp.)
Example A
Example B
Example C
Dew Point
Present
weather
Visibility
Wind Speed
Wind
Direction
Precipitation
(last 6 hours)
Barometric
Pressure
Barometric
Trend
Cloud Cover
SHOW UNITS ON THE TABLE ABOVE.
Bonus:
1.
2.
3.
4.
5
Example D
Example E
Lab #38 Station Models
Introduction:
A lot of information needs to be represented on a weather map without
cluttering up the map. Meteorologists devised a way of showing a lot of
information in an abbreviated fashion and called it a station model. A
typical station model can be found on page 13 of your Earth Science
Reference Tables. Some of the information is explained and this lab will
help you understand how the station models work.
Procedure: Using page 13 of your Earth Science Reference Tables, fill in the table on the
back of this sheet. In order to complete the problems, you will need to know
how to decode and encode barometric pressure readings.
BAROMETRIC PRESSURE
Weather maps generally use millibars (mb.) for air pressure. Inches and
centimeters of mercury are also used.
DECODING:
If the station model reading is:
less than 500
put a "10" in front and add a decimal place
251 becomes
1025.1 mb
005 becomes
1000.5 mb
greater than 500
put a "9" in front and add a decimal place
887 becomes
988.7 mb
962 becomes
996.2
ENCODING:
Work in reverse.
remove the "9" or "10" and remove the decimal
1032.6 becomes 326
977.9 becomes 779
Fill in the table on the answer sheet, decoding and encoding in the appropriate spaces.
WIND FEATHERS
The wind direction and speed is shown by “wind arrows”. The stick points to the
direction that the wind comes from. A short feather stands for 5 knots, a whole feather
equals 10 knots and a flag represents 50 knots. A knot equals 1.15 miles per hour. In
general, the wind speed can be considered the same for miles per hour and knots
because they are so close. Use the samples below to help you with the wind arrow
problems.
Wind Arrow Examples
From the east at 5 knots
From the west at 25 knots
From the north at 10 knots
From the east at 65
Draw wind arrows and feathers for the following conditions.
1.
Wind from the north at 15 knots
2.
Wind from the southeast at 30 knots
3.
Wind from the southwest at 75 knots
4.
Wind from the east at 55 knots
CLOUD COVER
The amount of cloud cover is shown by the amount of the circle that is colored in on
the station models. A completely filled circle means overcast; half filled means partly
cloudy and an open circle equals clear skies.
OTHER WEATHER DATA
The other data such as temperature, dewpoint, present conditions, visibility and
precipitation are explained on the Earth Science Reference Tables.
Complete the data table using the following station models.
A.
43
3/4
38
973
+05
.17
53
071
-15
B.
1/4
*
48
.1
C.
21
3/4
20
889
+25
D.
73
1/4
72
893
-05
.22
E.
1/4
BONUS:
,,65
253
64
.12
-13
For each station model, list the weather conditions that could not
exist or probably shouldn’t exist (i.e. rain at 23oF).