19 November 1941
Regarding the broadcast of a special message in an emergency.
In case of emergency (danger of cutting off our diplomatic relations), and the cutting off of international communications, the following warning will be added in the middle of the daily Japanese language short wave news broadcast.
(1) In case of a Japan-U. S. relations in danger: HIGASHI NO KAZEAME. *
(2) Japan-U. S. S. R. relations: KITANOKAZE KUMORI.**
(3) Japan-British relations: NISHI NO KAZE HARE.***
This signal will be given in the middle and at the end as a weather forecast and each sentence will be repeated twice. When this is heard please destroy all code papers, etc. This is as yet to be a completely secret arrangement.
Forward as urgent intelligence.
JD-1: 6875 (Y) Navy Trans. 11-28-41 (S-TT)
*East wind rain.
**North wind cloudy.
***West wind clear.
(EXHIBITS OF JOINT COMMITTEE , EXHIBIT NO. 1 INTERCEPTED DIPLOMATIC MESSAGES SENT BY THE JAPANESE GOVERNMENT BETWEEN JULY l AND DECEMBER 8, 1941)