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NDFD WMO Heading Reference


WMO 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


US Dept of Commerce
National Oceanic and Atmospheric Adminstration

National Weather Service
NCO Production Management Branch
1325 East West Highway
Silver Spring, MD 20910
Page last modified: April 15, 2015
Page Author:
Data Management
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