This is an old chart that shows you how to interpret the information. I first saw this chart in the book "Weather" by Herbert Zim, though it can be found in many other places. I don't know if the book is still in print. I used this chart years ago when I did my own weather forecasts, and it works rather well.
| WIND DIRECTION: | BAROMETER (AIR PRESSURE) AT SEA LEVEL: | EXPECTED WEATHER: |
| SW To NW | 30.10 to 30.20, steady | Fair with little temp. change for 2 days |
| SW To NW | 30.10 to 30.20, rising fast | Fair followed by precipitation in 2 days |
| SW To NW | 30.20 or above, steady | Continued fair with little temp. change |
| SW To NW | 30.20 or above, falling slowly | Slowly rising temp; fair for 2 days |
| S To SE | 30.10 to 30.20, falling slowly | Precipitation within 24 hours |
| S To SE | 30.10 to 30.20, falling fast | Increasing wind; precipitation in 12 - 24 hours |
| SE To NE | 30.10 to 30.20, falling slowly | Precipitation in 12 - 18 hours |
| SE To NE | 30.10 to 30.20, falling fast | Wind rising; precipitation within 12 hours |
| E To NE | 30.10 or above, falling slowly | Rain (snow) within 24 hours in winter |
| E To NE | 30.10 or below, falling fast | Precipitation, wind |
| SE To NE | 30.00 or below, falling slowly | Steady rain for 1 - 2 days |
| SE To NE | 30.00 or below, falling fast | Rain and high wind clearing in 36 hours |
| S to SW | 30.00 or below, rising slowly | Clearing within a few hours then fair |
| S to E | 29.80 or below, falling fast | Severe storm imminent, clearing in 24 hrs |
| E to N | 29.80 or below, falling fast | Severe northeast gale, precipitation |
| Going to W | 29.80 or below, rising fast | Clearing and colder |
Naturally there are other factors than these, but this gives you a rough guide to start with.
This table is almost entirely based on the chart in the book "Weather" by Paul Lehr, R. Will Burnett and Herbert S. Zim, Ph.D., Sc.D. Published by Golden Books, New York, revised edition 1987, page 145.
E-Mail me at pilot80 (at symbol) hotmail.com
Please enter the e-mail address manually, I need to format it this way to prevent bots from capturing this e-mail address for Spam.
© 2000 The Pilot of the Airwaves
