National Weather Service United States Department of Commerce

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 >

Telecommunication Operations Center

National Program

Table C3

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Table C3 or C8

Data type designator T2

There are TWO tables defined for this designator.

T1   = H

1. The WMO standard Table C3 as documented in Manual 386 PART II, Attachment II-5, and used for T1   = H, which is used in most parts of the world for defining these products.

T1   = H, Y, and Z

2. The U.S. National Practice Table C8 which is used to extend the definitions as defined in WMO manual 386 Table C3, and used for T1   = H, Y, and Z bulletins, used for most U.S. model products.