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Winter Storms in the Central and Eastern U.S.; Heavy Rain in the Southeast

A winter storm will bring heavy snow and ice to the Ohio Valley into the Mid-Atlantic through Wednesday. Significant ice is forecast for the Central Appalachians. Another winter storm will bring heavy snow and ice to the Central Plains today. Heavy to excessive rain will result in flash and river flooding threats over parts of the Lower Mississippi and Tennessee Valleys and Southern Appalachians. Read More >

Telecommunication Operations Center

National Program

Table C3

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Table C3

Geographical area designator A1

(when T1   =   D,G,O,P,or T)

Geographical area designator A2

(when T1   =   I, J, or K)

Instructions for the proper application of the geographical area designator.

1. The designator specified in this table should be used to the greatest extent possible to indicate the geographical area of the data contained within the text of the bulletin.

2. Where the geographical area of the data does not correspond exactly with the designator, the designator for the area most approximating that of the data may be used.

3. When the table does not contain a suitable designator for the geographical area, an alphabetic designator which is not assigned in the table should be introduced and the WMO secretariat notified.

Designator Geographical Area
A 0 - 90W northern hemisphere
B 90W - 180 northern hemisphere
C 180 - 90E northern hemisphere
D 90E - 0 northern hemisphere
E 0 - 90W tropical belt
F 90W - 180 tropical belt
G 180 - 90E tropical belt
H 90E - 0 tropical belt
I 0 - 90W southern hemisphere
J 90W - 180 southern hemisphere
K 180 - 90E southern hemisphere
L 90E - 0 southern hemisphere
M Lower left 10S 100E/upper right 70N 110W
N Northern hemisphere
P Area between 64.69N - 136.76W, 55.61N - 13.43W
64.69N - 156.76W, 55.61N - 33.43W
S Southern hemisphere
T 45W - 180 northern hemisphere
U Area between 21.0N - 128.1W, 36.0N - 130.9W
21.1N - 113.0W, 36.2N - 110.5W
V Area between 30.3N - 83.7W, 51.0N - 68.9W
19.8N - 64.5W, 33.3N - 47.1W
X Global Area (area not definable)