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Definitions (3118)

1
2   2

a


1. 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.).
Source: w1.weather.gov

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a ams


Arctic Air Mass
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a index


A daily index of geomagnetic activity derived as the average of the eight 3-hourly a indices.
Source: w1.weather.gov

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aaas


American Association for the Advancement of Science
Source: w1.weather.gov

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0   0

aawu


Alaskan Aviation Weather Unit
Source: w1.weather.gov

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ablation


Depletion of snow and ice by melting and evaporation.
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abndt


Abundant
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0   0

absolutely stable air


An atmospheric condition that exists when the environmental lapse rate is less than the moist adiabatic lapse rate.
Source: w1.weather.gov

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1   1

absolutely unstable air


An atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic lapse rate.
Source: w1.weather.gov

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1   0

absorption


The process in which incident radiant energy is retained by a substance by conversion to some other form of energy.
Source: w1.weather.gov


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