Example of sending and plotting abbreviated weather report

Example of sending and plotting abbreviated weather report

Gives meteorological message with data and transmitted code and gives instructions. Notes how it would be plotted on synoptic chart. Stamped RAF Peterborough on reverse.

1940-05-20

Handwritten document

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MRosserLV745193-190517-17

[underlined] EXAMPLE of SENDING and PLOTTING ABBREVIATED WEATHER REPORT. [/underlined]

Message sent (if by Meteorological Staff) is Report F13, three groups of 5 numbers covering:-

IIIClCm wwVhNh DDFWN.

Suppose message is sent by ABINGDON, and the weather is as follow:-
Form of low cloud – Cumulo-nimbus (Cumb.)
Form of medium cloud – Alto-cumulus (ACu.)
Present weather – Intermittent moderate rain.
Visibility – 12 1/2 miles.
Height of base of low cloud – 2500 feet.
Total amount of low cloud - 5/10.
Wind direction – South West.
Wind force – Moderate gale.
Past weather – Showers.
Total amount of cloud – 7/10.

message transmitted is:- 38233-63854-20785. (See A.P.1234 App. XV.)

This is entered on Synoptic Chart by [underlined] agreed symbols [/underlined] (NOT NUMBERS)
thus:- [diagram] – Message appears:- [diagram] – Red ink is used for certain items.

NOTE. In full report much other information (barometer etc.) is added.

[page break]

R.A.F. PETERBOROUGH
REFERENCE 79140
20 MAY 1940
CROWN COPYRIGHT RESERVED