A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

A1. Abbrevation for hail in weather observations. 2. Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.).

Arctic Air Mass

A daily index of geomagnetic activity derived as the average of the eight 3-hourly a indices.

American Association for the Advancement of Science