------------------------------------------------------------------------ Hourly Data to 24 Hours (NBH) ------------------------------------------------------------------------ TMP = temperature, degrees F TSD = standard deviation of temperature, degrees F DPT = dew point temperature, degrees F DSD = dew point temperature standard deviation, degrees F SKY = sky cover, percent SSD = sky cover standard deviation, percent WDR = wind direction, nearest tens degrees (northerly=36; easterly=9; calm=00) oceanic-only stations only have WDR for cycles=0,7,12,19 WSP = wind speed, knots WSD = wind speed standard deviation, knots GST = wind gust, knots GSD = wind gust standard deviation, knots P01 = 1-hour PoP, percent P06 = 6-hour PoP, percent Q01 = 1-hour QPF, 1/100 inches T01 = 1-hour thunderstorm probability, percent PZR = conditional probability of freezing rain, percent PSN = conditional probability of snow, percent PPL = conditional probability of sleet / ice pellets, percent PRA = conditional probability of rain, percent S01 = 1-hour snow amount, 1/10 inches SLV = snow level, 100s feet MSL I01 = 1-hour ice amount, 1/100 inches CIG = ceiling height, 100s feet (>5000 ft reported to the nearest 1000 ft; -88=unlimited) MVC = probability of ceiling MVFR flight conditions (ceiling <= 3000 ft), percent IFC = probability of ceiling IFR flight conditions (ceiling < 1000 ft), percent LIC = probability of ceiling LIFR flight conditions (ceiling < 500 ft), percent LCB = lowest cloud base, 100s feet (>5000 ft reported to the nearest 1000 ft; -88=unlimited) VIS = visibility, 1/10th miles (rounded to nearest mile for values >= 1 mile) MVV = probability of visibility MVFR flight conditions (visibility <= 5 miles), percent IFV = probability of visibility IFR flight conditions (visibility < 3 miles), percent LIV = probability of visibility LIFR flight conditions (visibility < 1 mile), percent MHT = mixing height, 100s feet AGL TWD = transport wind direction, nearest tens degrees (northerly=36; easterly=9; calm=00) TWS = transport wind speed, knots (<0.5 knots will be listed as 0 (calm)) HID = Haines Index (unitless) SOL = instantaneous solar radiation, 10s W/m2 (ex: 8=80 W/m2; non-zero values < 10 = 1) ------------------------------------------------------------------------ 3-Hourly Data to 72 Hours (NBS) ------------------------------------------------------------------------ XND* = standard deviation of maximum or minimum temperature, degrees F TMP = temperature, degrees F TSD = standard deviation of temperature, degrees F DPT = dew point temperature, degrees F DSD = dew point temperature standard deviation, degrees F SKY = sky cover, percent SSD* = sky cover standard deviation, percent WDR = wind direction, nearest tens degrees (northerly=36; easterly=9; calm=00) oceanic-only stations only have WDR for cycles=0,7,12,19 WSP = wind speed, knots (<0.5 knots will be listed as 0 (calm)) WSD = wind speed standard deviation, knots GST = wind gust, knots GSD = wind gust standard deviation, knots P06 = 6-hour PoP, percent P12 = 12-hour PoP, percent Q06 = 6-hour QPF, 1/100 inches Q12 = 12-hour QPF, 1/100 inches DUR = Duration of precipitation, hours T03 = 3-hour thunderstorm probability, percent T06 = 6-hour thunderstorm probability, percent T12 = 12-hour thunderstorm probability, percent PZR = conditional probability of freezing rain, percent PSN = conditional probability of snow, percent PPL = conditional probability of sleet / ice pellets, percent PRA = conditional probability of rain, percent S06 = 6-hour snow amount, 1/10 inches SLV** = snow level, 100s feet MSL (rounded to nearest 1000 ft for values > 10,000 ft) I06 = 6-hour ice amount, 1/100 inches CIG = ceiling height, 100s feet (>5000 ft reported to the nearest 1000 ft; -88=unlimited) IFC = probability of ceiling IFR flight conditions (ceiling < 1000 ft), percent LCB = lowest cloud base, 100s feet (>5000 ft reported to the nearest 1000 ft; -88=unlimited) VIS = visibility, 1/10th miles up to 10 miles (rounded to nearest mile for values >= 1 mile; VIS > 10 miles = 100) IFV* = probability of visibility IFR flight conditions (visibility < 3 miles), percent MHT = mixing height, 100s feet AGL TWD = transport wind direction, nearest tens degrees (northerly=36; easterly=9; calm=00) TWS = transport wind speed, knots (<0.5 knots will be listed as 0 (calm)) HID = Haines Index (unitless) SOL = instantaneous solar radiation, 10s W/m2 (ex: 8=80 W/m2; non-zero values < 10 = 1) SWH = significant wave height, feet (marine and some near-water stations only ------------------------------------------------------------------------ 12-Hourly Data to ~7 Days (NBE) ------------------------------------------------------------------------ TXN = 18-hour maximum and minimum temperatures, degrees F. XND = standard deviation of maximum or minimum temperature, degrees F TMP = temperature, degrees F TSD = standard deviation of temperature, degrees F DPT = dew point temperature, degrees F DSD = dew point temperature standard deviation, degrees F SKY = sky cover, percent SSD = sky cover standard deviation, percent WDR = wind direction, nearest tens degrees (northerly=36; easterly=9; calm=00) oceanic-only stations only have WDR for cycles=0,7,12,19 WSP = wind speed, knots (<0.5 knots will be listed as 0 (calm)) WSD = wind speed standard deviation, knots GST = wind gust, knots GSD* = wind gust standard deviation, knots P12 = 12-hour PoP, percent Q12 = 12-hour QPF, 1/100 inches Q24 = 24-hour QPF, 1/100 inches DUR = Duration of precipitation, hours (CONUS only) T12 = 12-hour thunderstorm probability, percent PZR = conditional probability of freezing rain, percent PSN = conditional probability of snow, percent PPL = conditional probability of sleet / ice pellets, percent PRA = conditional probability of rain, percent S12 = 12-hour snow amount, 1/10 inches SLV = snow level, 100s feet MSL I12 = 12-hour ice amount, 1/100 inches S24 = 24-hour snow amount, 1/10 inches SOL = 12-hour mean++ solar radiation, 10s W/m2 (++for hours in period with sunlight present) SWH = significant wave height, feet (marine and some near-water stations only) ------------------------------------------------------------------------ 12-Hourly Data Day 8, 9, 10 (NBX) ------------------------------------------------------------------------ TXN = 18-hour maximum and minimum temperatures, degrees F. XND = standard deviation of maximum or minimum temperature, degrees F TMP = temperature, degrees F TSD = standard deviation of temperature, degrees F DPT = dew point temperature, degrees F DSD = dew point temperature standard deviation, degrees F SKY = sky cover, percent SSD = sky cover standard deviation, percent WDR = wind direction, nearest tens degrees (northerly=36; easterly=9; calm=00) oceanic-only stations only have WDR for cycles=0,7,12,19 WSP = wind speed, knots (<0.5 knots will be listed as 0 (calm)) WSD = wind speed standard deviation, knots GST = wind gust, knots GSD = wind gust standard deviation, knots P12 = 12-hour PoP, percent Q12 = 12-hour QPF, 1/100 inches Q24 = 24-hour QPF, 1/100 inches For 13Z only: extended QPF from QMD Mean 24-hour QPF displayed for hours ~264-370 DUR = Duration of precipitation, hours (CONUS only for NBX) PZR = conditional probability of freezing rain, percent PSN = conditional probability of snow, percent PPL = conditional probability of sleet / ice pellets, percent PRA = conditional probability of rain, percent S12 = 12-hour snow amount, 1/10 inches SLV = snow level, 100s feet MSL I12 = 12-hour ice amount, 1/100 inches S24 = 24-hour snow amount, 1/10 inches SOL = 12-hour mean++ solar radiation, 10s W/m2 (++for hours in period with sunlight present) SWH = significant wave height, feet (marine and some near-water stations only)