There will be daily chances for scattered thunderstorms across portions of the Central and Eastern U.S. through the weekend, with severe thunderstorms possible in the northern Plains and Upper Midwest. Potential severe storm hazards may include large hail, damaging winds, and a few tornadoes. Storms could also produce heavy rain that may lead to isolated instances of flash flooding. Read More >
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National Program
Instructions for the proper application of the data type designator
1. The first letter A1 will denote the nature of the ship or automatic marine station:
For ocean weather stations: W
For mobile ships and other marine stations: V
2. The second letter A2 will denote the area from which the reports contained in the bulletin originate:
Designator | Data Area |
A | Area between 30° N - 60° S, 035° W - 070° E |
B | Area between 90° N - 05° N, 070° E - 180° E |
C | Area between 05° N - 60° S, 120° W - 035° W |
D | Area between 90° N - 05° N, 180° W - 035° W |
E | Area between 05° N - 60° S, 070° E - 120° W |
F | Area between 90° N - 30° N, 035° W - 070° E |
J | Area between 60° S |
X | More than one area |
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
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