Severe Weather Threat index. A stability index developed by the Air Force which incorporatesinstability, wind shear, and wind speeds as follows: SWEAT=(12 Td 850 ) + (20 [TT-49]) +( 2 f 850) + f 500 + (125 [s+0.2]) where (1) Td 850 is the dew point temperature at 850 mb, (2) TT is the total-totals index, (3) f 850 is the 850-mb wind speed (in knots), (4) f 500 is the 500-mb wind speed (in knots), and (5) s is the sine of the angle between the wind directions at 500 mb and 850 mb (thus representing thedirectional 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 sounding analysis programs. SWODY1, SWODY2 (sometimes pronounced swoe-dee) - The day-1 and day-2 convective outlooks issued by SELS