Chemical Downwind Message for KEDW

This product is derived from 20 MAY 2026 12Z NAM model data.

DD/HH  DDD FFF A TT H W C
20/12  054 005 7 11 4 - 0
20/14  180 000 7 11 4 - 0
20/16  252 003 7 21 2 - 0
20/18  217 005 6 27 1 - 0
20/20  187 003 5 30 0 - 0
20/22  117 003 4 30 0 - 0
21/00  083 009 4 30 0 - 0
21/02  067 016 4 27 1 - 0
21/04  060 012 4 19 2 - 0
21/06  050 009 4 14 3 - 2
21/08  034 009 4 12 4 - 0
21/10  032 007 4 11 4 - 0
21/12  036 005 4 10 4 - 0
21/14  342 001 4 12 4 - 0
21/16  045 001 4 22 2 - 0
21/18  072 005 4 29 1 - 0
21/20  061 009 5 32 0 - 0
21/22  063 016 5 32 0 - 0
22/00  059 027 6 30 1 - 0
22/02  057 027 6 26 2 - 0
22/04  052 018 6 20 3 - 0
22/06  041 012 6 15 5 - 0
22/08  041 012 6 13 6 - 0
22/10  039 011 7 11 6 - 0
22/12  035 011 7 09 7 - 0
22/14  035 007 7 13 5 - 0
22/16  074 009 7 24 2 - 0
22/18  080 009 6 30 1 - 0
22/20  062 014 4 32 1 - 0
22/22  059 024 4 32 1 - 0
23/00  057 031 3 30 2 - 0
23/02  058 029 3 25 2 - 0
23/04  049 020 3 19 4 - 0
23/06  043 014 3 16 5 - 0
23/08  040 012 3 13 6 - 0
23/10  041 009 3 11 7 - 0
23/12  036 009 3 09 8 4 0
23/14  017 003 3 12 6 - 0
23/16  057 009 3 23 2 - 0
23/18  052 007 4 29 1 - 0
23/20  046 012 4 32 1 - 0
23/22  056 022 4 32 1 - 0
24/00  057 031 5 30 1 - 0

Legend:

DD/HH  DDD FFF A TT H W C

DD   Valid Time Forecast Day (UTC)
HH   Valid Time Forecast Hour (UTC)
DDD  Surface Wind Direction (to a point, not from; e.g. 090 means towards the east
FFF  Wind Speed (km/hr)
A    Air Stability Code (from Lifted Index)
      LI   <= -1.5       A = 1
     -1.5  <  LI <  1.5  A = 2
      1.5  <= LI <  4.5  A = 3
      4.5  <= LI <  7.5  A = 4
      7.5  <= LI < 10.5  A = 5
     10.5  <= LI < 13.5  A = 6
     13.5  <= LI         A = 7
TT   Air Temperature Code (deg C) (temperatures greater than 50 are encoded as 50,
     temperatures less than -49 are encoded as 99, temperatures less than 0 are
     encoded by adding 50 to the absolute value of the temperature.
H    Relative Humidity Code (encoded with the 10s digit of the value where 100% = 9
     for example, 19% is 1, 56% is 5, 6% is 0
W    Significant Weather Code (Fog or BR is 4, Rain and Freezing Rain is 6,
     Mixed/Ice and Snow is 7, TRW or Svr TRW is 9, no precip is '-'.
     ***Note*** Code 9 is not evaluated in this output.
C    Total Cloud Cover is evaluated on a column directly above the model grid point
     and does not account for a horizon to horizon view.  If any of low, mid or hi cloud
     cover is evaluated as greater than 50%, cloud cover is encoded 2, otherwise
     it is encoded as 0.