1. Analysis of a plotted weather map
Isobars:
Draw with pencil: easy to correct mistakes
Every 5 hPa: , 995, 1000, 1005, 1010, ...
Tend to be roughly parallel to one another
Isobars can never intersect
If an isobar starts on the map border, then it ends on the map border
Start with p = 1000 hPa and then go up (1005, 1010) and down (995, 990)
Over the ocean: omit isobars in data-sparse regions

2. Example

3. Example
1000

4. Example
1000
1005

5. Example
1000
1005
1010

6. Example
1000
1005
1010
1015

7. Example
995
1000
1005
1010
1015

8. Example
990
995
1000
1005
1010
1015

9. Analysis of a plotted weather map
Precipitation:
Only present weather (ww code) not past weather (W1 code) !!
Continuous precipitation: (drizzle), (rain), (snow)
Transient precipitation (light/heavy rain/hail/snow showers)
Continuous precipitation: green outline and green light fill
Note: only when precipitation is actually happening, not with the ] symbol!
Transient precipitation: large ww-symbol in green
Lightning: large ww-symbol in red

10. Example

11. Example

12. Example

13. Example

14. Example

15. Example

16. Example

17. Example

18. Analysis of a plotted weather map
Isallobars:
Pressure rise in blue; pressure falls in red
Only lines: +15, +30, +45, and -15, -30, -45,
Isallobars tend to run parallel to one another (just like isobars)
Gradients may sometimes be very large (i.e. isolines close together)
Start with the strongest pressure fall and pressure rise

19. Example
-60

20. Example
-45
-60

21. Example
-45
-30
-60 D