Shortly after the 10:00 p. m. time signals. NAA sends weather bulletins in code letters and figures to express weather conditions along the eastern coast of the United States and the Great Lakes.
In case you have lost the key letters used they are given below:―
U. S. W. B. United States Weather Bureau
| S Sydney | |
| T | Nantucket |
| DB | Delaware Breakwater |
| H | Hatteras |
| C | Charleston |
| K | Key West |
| P | Pensacola |
| B | Bermuda |
| Du | Duluth |
| M | Marquette |
| U | Sault Ste. Marie |
| G | Green Bay |
| Ch | Chicago |
| L | Alpena |
| D | Detroit |
| V | Cleveland |
| F | Buffalo |
The first three Figures denote the barometric pressure in inches as (001―30.01) or 959―29.59). The fourth figure represents the direction of the wind:
| 1 | North | 5 | South | |
| 2 | Northeast | 6 | Southwest | |
| 3 | East | 7 | West | |
| 4 | Southeast | 8 | Northwest | |
The last figure gives the force of the wind on the Beaufort Scale.
Number and designation. Miles per hour.
| 0 | Calm | 0-3 |
| 1 | Light air | 8 |
| 2 | Light breeze | 13 |
| 3 | Gentle breeze | 18 |
Examples of Code:―
U. S. W. B. S. 00355 T 93472 United States Weather Bureau Sydney, 30.03, south, fresh breeze, 28 miles per hour; Nantucket, 29.34, west, light breeze, 13 miles per hour.
| 4 | Moderate breeze | 23 |
| 5 | Fresh breeze | 28 |
| 6 | Strong breeze | 34 |
| 7 | Moderate gale | 40 |
| 8 | Fresh gale | 48 |
| 9 | Strong gale | 56 |
| 10 | Whole gale | 65 |
| 11 | Storm | 75 |
| 12 | Hurricane | 90 and over |
Wind force greater than 9 is given by a word instead of figures.
This work is in the public domain in the United States because it was published before January 1, 1924.
The author died in 1985, so this work is also in the public domain in countries and areas where the copyright term is the author's life plus 30 years or less. This work may also be in the public domain in countries and areas with longer native copyright terms that apply the rule of the shorter term to foreign works.