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**ANALYSIS**
**MODELS
/ FORECASTS**
**General
Pressure
Heights**
Boundary Layer: about 1000mb (300 ft / 100m) up to about 925mb (2,300 ft
/ 700m)
850 mb =5000ft or 1.5km
700 mb = 10,000ft or 3km
500 mb = 18,000ft or 5.5km
400mb = 23,300ft or 7km
300 mb = 30,000ft or 9km
200 mb = 39,000ft or 12km
150 mb = 45,000ft or 13.5km
100 mb = 53,000ft or 16km
US Regions
1
US
Regions 2
CANADA
Map