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NDFD WMO Heading ReferenceWMO Headings have the format of T1T2A1A2ii CCCC . The CCCC for all NDFD product WMO headings is KWBN The T1 for all NDFD product WMO headings is Y . Super headings are used to aggregate products for the same parameter (element) and sector. These aggregate products contain individual products for all forecast periods. For these aggregate products the WMO headings are consistent with those for individual NDFD products except the A2 is always Z. National Digital Forecast Database (NDFD) NDFD Data Type Designator (T2) A = SKY COVER B = WIND DIRECTION C = WIND SPEED D = PROBABILITY OF PRECIPITATION (12 HOURS) E = SURFACE TEMPERATURE F = DEWPOINT TEMPERATURE G = DAYTIME MAXIMUM TEMPERATURE H = NIGHTTIME MINIMUM TEMPERATURE I = QUANTITATIVE PRECIPITATION J = WEATHER K = WAVE HEIGHT L = UNASSIGNED M = UNASSIGNED N = UNASSIGNED O = UNASSIGNED P = UNASSIGNED Q = UNASSIGNED R = UNASSIGNED S = SNOWFALL AMOUNT T = UNASSIGNED U = FREE AIR WIND DIRECTION V = FREE AIR WIND SPEED W = UNASSIGNED X = UNASSIGNED Y = UNASSIGNED Z = UNASSIGNED NDFD Geographical Area Designator (A1) A= PUERTO RICO B= NORTHEAST C= MID-ATLANTIC D= SOUTHEAST E= EAST GREAT LAKES F= CENTRAL GREAT LAKES G= UPPER MISSISSIPPI VALLEY H= CENTRAL MISSISSIPPI VALLEY I= SOUTHERN MISSISSIPPI VALLEY J= NORTHERN PLAINS K= CENTRAL PLAINS L= SOUTHERN PLAINS M= NORTHERN ROCKIES N= CENTRAL ROCKIES O= SOUTHERN ROCKIES P= PACIFIC NORTHWEST Q= PACIFIC SOUTHWEST R= ALASKA S= HAWAII T= GUAM U= CONUS V= UNASSIGNED W= UNASSIGNED X= UNASSIGNED Y= UNASSIGNED Z= UNASSIGNED NDFD Reference Time Designator (A2 and ii) A = Day 0 ii = hour (0-23) B = Day 1 ii = hour (0-23) C = Day 2 ii = hour (0-23) D = Day 3 ii = hour (0-23) E = Day 4 ii = hour (0-23) F = Day 5 ii = hour (0-23) G = Day 6 ii = hour (0-23) H = Day 7 ii = hour (0-23) I = Day 8 ii = hour (0-23) J = Day 9 ii = hour (0-23) K = Day 10 ii = hour (0-23) L = Day 11 ii = hour (0-23) M = Day 12 ii = hour (0-23) N = Day 13 ii = hour (0-23) O = Day 14 ii = hour (0-23) P = UNASSIGNED Q = UNASSIGNED R = UNASSIGNED S = UNASSIGNED T = UNASSIGNED U = UNASSIGNED V = UNASSIGNED W = Weeks ii = week # (0-99) X = Months ii = month # (0-99) Y = Year ii = year # (0-99) Z = Super heading designator ii always = 99
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