1. A Graphical Representation of METAR
The Station Model
A Graphical Representation of METAR

2. The Weather Station Model
Draw a Station Model
©Steve Kluge Some images from the NYSED Earth Science Reference Tables

3. 196 19.6 919.6 1019.6 Decoding the Coded Pressure
Insert a decimal point to the left of the last digit
19.6
Put a “9” and a “10” in front of the result
919.6
1019.6
Test the results against the range of normal atmospheric pressures
919.6 is below the range of normal pressures….
REJECTED!
is within the range of normal pressures….
ACCEPTED!
Coded pressure 196= mb
Decode these coded pressures:
1000.2
999.3
1028.0
1000.0
Back to the Station Model
How to encode pressures
©S. Kluge 2007

4. Encoding the Pressure
1013.5
Remove the decimal point
10135
Report the last 3 digits
135
Pressure = 135 encoded pressure
Encode these pressures:
327
873
122
001
Back to the Station Model
Back to Decoding Pressures
©S. Kluge 2007

5. / means the pressure is currently rising
The Barometric Trend /
+ means “Higher now than it was 3 hours ago”
(- means “Lower now than it was 3 hours ago”)
19 means the pressure has changed by 1.9 mb
/ means the pressure is currently rising
( \ means the pressure is currently falling)
What was the pressure 3 hours ago?
Here?
1017.7
1003.5
Back to the Station Model
©S. Kluge 2007

6. Back to the Station Model
©S. Kluge 2007

7. NE at 25 Knots E at 5 Knots SE at 10 Knots Back to the Station Model
©S. Kluge 2007

8. Draw a Station Model for These Conditions:
Temperature= 45F
Dewpoint= 32F
Wind NE at 20 knots
Overcast
Visibility= 1.5 miles
Rain Showers
Pressure Now= mb
Pressure 3 hrs. ago= mb
Barometer Falling
Precipitation in last 6 hrs.= .53 in.
Back to the Station Model
©S. Kluge 2007