Primary Swell DirectionPrevailing direction of swell propagation.SWESnow Water Equivalent (the amount of water content in a snowpack or snowfall).SWEATSevere Weather ThrEAT index; a stability index developed by the Air Force which incorporates instability, wind shear, and wind speeds as follows:
SWEAT=(12 Td 850 ) + (20 [TT-49]) +( 2 f 850) + f 500 + (125 [s+0.2]) where
- Td 850 is the dew point temperature at 850 mb,
- TT is the total-totals index,
- f 850 is the 850-mb wind speed (in knots),
- f 500 is the 500-mb wind speed (in knots), and
- s is the sine of the angle between the wind directions at 500 mb and 850 mb (thus representing the directional shear in this layer).
SWEAT values of about 250-300 or more indicate a greater potential for severe weather, but as with all stability indices, there are no magic numbers.
The SWEAT index has the advantage (and disadvantage) of using only mandatory-level data (i.e., 500 mb and 850 mb), but has fallen into relative disuse with the advent of more detailed upper air sounding analysis programs.SwellWind-generated waves that have travelled out of their generating area. Swells characteristically exhibit smoother, more regular and uniform crests and a longer period than wind waves.Swell DirectionThe direction from which the swells are propagating.
You can either type in the word you are looking for in the box below or browse by letter.
Search:
Browse by letter:
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z