Arctic Cold Front Impacting the Great Lakes into the Northeast

A powerful Arctic cold front will sweep across the Great Lakes today and into the Northeast early Thursday. Expect brief, intense bursts of heavy snowfall and gusty winds. Widespread strong winds will spread from the Northern Plains to the Great Lakes today and reach the Central Appalachians, Mid-Atlantic, and Northeast by Thursday, where some blizzard conditions are expected in the Appalachians. Read More >

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)