If you want more information, the Imagery page and the SSEC home page are also available.
DAY - Valid Month and Day (UTC). HOUR - Valid Hour (UTC). MX/MN - Maximum or minimum temperature for TEMP - Temperature at specified time (F). DEWPT - Dew point temperature at specified time(F). CLDS - Opaque cloud rover forecast for specified time (see below). WDIR - Wind direction ( x 10 = compass direction) for specified time. WSPD - Wind speed (kts) for specified time. POP06 - Probability of precipitation for 6-h period ending at specified time. POP12 - Probability of precipitation for 12-h period ending at specified time. QPF - Precipitation amount forecast for 6- and 12-h periods (see below) Thunderstorm/conditional severe T-storm probs. for 6-h periods ending at time. TSV12 - Thunderstorm/conditional severe T-storm probs. for 12-h periods ending at time. PTYPE - Conditional precipitation type forecast for specified time (see below). POZP - Conditional probability of freezing precip. or Ice pellets, if precipitating. POSN - Conditional probability of snow for specified time, if precipitating. SNOW - Snow amount for 6- and 12-h periods(see below). CIG - Ceiling height forecast for specified time (see below). VIS - Visibility forecast for specified time (see below). OBVIS - Obstruction to vision forecast for specified time (see below). CLDS CL - Clear SC - Scattered BK - Broken OV - Overcast PTYPE R - Liquid Z - Freezing or Ice pellets S - Snow OBVIS H - Haze F - Fog N - No haze, or fog QPF format "A/B" A - Value for 6-h period 0 = no precipitation 1 = 0.01 - 0.09 inches 2 = 0.10 - 0.24 inches 3 = 0.25 - 0.49 inches 4 = 0.50 - 0.99 inches 5 = > 1.00 inches B - Value for 12-h period 0 = no precipitation 1 = 0.01 - 0.09 inches 2 = 0.10 - 0.24 inches 3 = 0.25 - 0.49 inches 4 = 0.50 - 0.99 inches 5 = 1.00 - 1.99 inches 6 = > 2.00 inches SNOW format "A/B" A Value for 6-h period 0 = no snow 1 = trace - < 2 inches 2 = > 2 Inches B Value for 12-h period 0 = no snow 1 = trace - < 2 inches 2 = 2 - < 4 inches 4 = 4 - < 6 inches 6 = > 6 inches CIG 1 = < 200 ft. 2 = 200 - 400 ft. 3 = 500 - 900 ft. 4 = 1000 - 3000 ft. 5 = 3100 - 6500 ft 6 = 6600 - 12000 ft. 7 = > 12000 ft. VIS 1 = < 1/2 mile 2 = 1/2 - 7/8 mile 3 = 1 - 2 3/4 miles 4 = 3 - 5 miles 5 = > 5 miles