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Degrib: NDFD, Weather, and Shapefiles



Degrib: Wx-inten shapefile field

In the following table keep in mind:
  • If there was "No Weather", I didn't care what intensity it was.
  • The "gray background" weather types were added on 1/20/2004.
  • Hail was supposedly removed on 8/12/2004, but I left its place in the table.
  • With version 1.60 (8/24/2004), I introduced "Unknown Intensity" values. The reason I introduced them was that the weather string seems to change over time. I wanted to be able to encode that I didn't recognize the intensity. Prior to that, the table did not have the "Unknown Intensity" values, so "BD" used to start with 6 instead of 7.
ValueAbreviationEnglish translation
0<NoWx>"No Weather"
1K:<NoInten>"Smoke"
2K:--"Very Light Smoke"
3K:-"Light Smoke"
4K:m"Moderate Smoke"
5K:+"Heavy Smoke"
6K:?"Unown Intensity Smoke"
7BD:<NoInten>"Blowing Dust"
8BD:--"Very Light Blowing Dust"
9BD:-"Light Blowing Dust"
10BD:m"Moderate Blowing Dust"
11BD:+"Heavy Blowing Dust"
12BD:?"Unown Intensity Blowing Dust"
13BS:<NoInten>"Blowing Snow"
14BS:--"Very Light Blowing Snow"
15BS:-"Light Blowing Snow"
16BS:m"Moderate Blowing Snow"
17BS:+"Heavy Blowing Snow"
18BS:?"Unown Intensity Blowing Snow"
19H:<NoInten>"Haze"
20H:--"Very Light Haze"
21H:-"Light Haze"
22H:m"Moderate Haze"
23H:+"Heavy Haze"
24H:?"Unown Intensity Haze"
25F:<NoInten>"Fog"
26F:--"Very Light Fog"
27F:-"Light Fog"
28F:m"Moderate Fog"
29F:+"Heavy Fog"
30F:?"Unown Intensity Fog"
31L:<NoInten>"Drizzle"
32L:--"Very Light Drizzle"
33L:-"Light Drizzle"
34L:m"Moderate Drizzle"
35L:+"Heavy Drizzle"
36L:?"Unown Intensity Drizzle"
37R:<NoInten>"Rain"
38R:--"Very Light Rain"
39R:-"Light Rain"
40R:m"Moderate Rain"
41R:+"Heavy Rain"
42R:?"Unown Intensity Rain"
43RW:<NoInten>"Rain Showers"
44RW:--"Very Light Rain Showers"
45RW:-"Light Rain Showers"
46RW:m"Moderate Rain Showers"
47RW:+"Heavy Rain Showers"
48RW:?"Unown Intensity Rain Showers"
49A:<NoInten>"Hail"
50A:--"Very Light Hail"
51A:-"Light Hail"
52A:m"Moderate Hail"
53A:+"Heavy Hail"
54A:?"Unown Intensity Hail"
55FR:<NoInten>"Frost"
56FR:--"Very Light Frost"
57FR:-"Light Frost"
58FR:m"Moderate Frost"
59FR:+"Heavy Frost"
60FR:?"Unown Intensity Frost"
61ZL:<NoInten>"Freezing Drizzle"
62ZL:--"Very Light Freezing Drizzle"
63ZL:-"Light Freezing Drizzle"
64ZL:m"Moderate Freezing Drizzle"
65ZL:+"Heavy Freezing Drizzle"
66ZL:?"Unown Intensity Freezing Drizzle"
67ZR:<NoInten>"Freezing Rain"
68ZR:--"Very Light Freezing Rain"
69ZR:-"Light Freezing Rain"
70ZR:m"Moderate Freezing Rain"
71ZR:+"Heavy Freezing Rain"
72ZR:?"Unown Intensity Freezing Rain"
73IP:<NoInten>"Ice Pellets (sleet)"
74IP:--"Very Light Ice Pellets (sleet)"
75IP:-"Light Ice Pellets (sleet)"
76IP:m"Moderate Ice Pellets (sleet)"
77IP:+"Heavy Ice Pellets (sleet)"
78IP:?"Unown Intensity Ice Pellets (sleet)"
79S:<NoInten>"Snow"
80S:--"Very Light Snow"
81S:-"Light Snow"
82S:m"Moderate Snow"
83S:+"Heavy Snow"
84S:?"Unown Intensity Snow"
85SW:<NoInten>"Snow Showers"
86SW:--"Very Light Snow Showers"
87SW:-"Light Snow Showers"
88SW:m"Moderate Snow Showers"
89SW:+"Heavy Snow Showers"
90SW:?"Unown Intensity Snow Showers"
91T:<NoInten>"Thunderstorms"
92T:--"Very Light Thunderstorms"
93T:-"Light Thunderstorms"
94T:m"Moderate Thunderstorms"
95T:+"Heavy Thunderstorms"
96T:?"Unown Intensity Thunderstorms"
97BN:<NoInten>"Blowing Sand"
98BN:--"Very Light Blowing Sand"
99BN:-"Light Blowing Sand"
100BN:m"Moderate Blowing Sand"
101BN:+"Heavy Blowing Sand"
102BN:?"Unown Intensity Blowing Sand"
103ZF:<NoInten>"Freezing Fog"
104ZF:--"Very Light Freezing Fog"
105ZF:-"Light Freezing Fog"
106ZF:m"Moderate Freezing Fog"
107ZF:+"Heavy Freezing Fog"
108ZF:?"Unown Intensity Freezing Fog"
109IC:<NoInten>"Ice Crystals"
110IC:--"Very Light Ice Crystals"
111IC:-"Light Ice Crystals"
112IC:m"Moderate Ice Crystals"
113IC:+"Heavy Ice Crystals"
114IC:?"Unown Intensity Ice Crystals"
115IF:<NoInten>"Ice Fog"
116IF:--"Very Light Ice Fog"
117IF:-"Light Ice Fog"
118IF:m"Moderate Ice Fog"
119IF:+"Heavy Ice Fog"
120IF:?"Unown Intensity Ice Fog"
121VA:<NoInten>"Volcanic Ash"
122VA:--"Very Light Volcanic Ash"
123VA:-"Light Volcanic Ash"
124VA:m"Moderate Volcanic Ash"
125VA:+"Heavy Volcanic Ash"
126VA:?"Unown Intensity Volcanic Ash"
127ZY:<NoInten>"Freezing Spray"
128ZY:--"Very Light Freezing Spray"
129ZY:-"Light Freezing Spray"
130ZY:m"Moderate Freezing Spray"
131ZY:+"Heavy Freezing Spray"
132ZY:?"Unown Intensity Freezing Spray"
133WP:<NoInten>"Water Sprouts"
134WP:--"Very Light Water Sprouts"
135WP:-"Light Water Sprouts"
136WP:m"Moderate Water Sprouts"
137WP:+"Heavy Water Sprouts"
138WP:?"Unown Intensity Water Sprouts"
139?:<NoInten>"Unknown Weather"
140?:--"Very Light Unknown Weather"
141?:-"Light Unknown Weather"
142?:m"Moderate Unknown Weather"
143?:+"Heavy Unknown Weather"
144?:?"Unown Intensity Unknown Weather"


Degrib: Cover shapefile field

In the following table keep in mind:
  • The "blue font" coverage types were added on 8/13/2004.
ValueAbreviationEnglish translation
00<NoCov>"No Coverage/Probability"
01Iso"Isolated"
02Sct"Scattered"
03Num"Numerous"
04Wide"Widespread"
05Ocnl"Occasional"
06SChc"Slight Chance of"
07Chc"Chance of"
08Lkly"Likely"
09Def"Definite"
10Patchy"Patchy"
11Areas"Areas of"
12Pds"Periods of"
13Frq"Frequent"
14Inter"Intermittent"
15Brf"Brief"
16<unknown>"Unknown Coverage"


Degrib: Hazard shapefile field

There are 5 hazards per word, and prior to Aug 2004, there was 9 types of hazards, so each hazard was given a digit (see table below). The digits were sorted, and the result was stored in the Hazard field for a given word. Example: "SmA,DmgW" became "54000", which after it was sorted became "00045", which was stored.

After Aug 2004, there were 12 types of hazards so we needed 2 digits per hazard. Our previous example would be "0504000000" which would then be stored as "0000000405".

In the following table keep in mind:
  • The "blue font" hazard types were added on 8/13/2004.
  • OR, MX, Mention, Primary are not hazards, so I chose to map them to "None".
  • The current method is limited to 25 hazards. The code can be modified to handle more, but currently it is limited to 25.
ValueAbreviationEnglish translation
00<NoCov>"None"
01FL"Frequent Lightning"
02GW"Gusty Winds"
03HvyRn"Heavy Rain"
04DmgW"Damaging Winds"
05SmA"Small Hail"
06LgA"Large Hail"
07OLA"Outlying Areas"
08OBO"On Bridges and Overpasses"
09OGA"On Grassy Areas"
10Dry"Dry"
11TOR"Tornado"
12<unknown>"Unknown Hazard"
00Mention"Include Unconditionally"
00Primary"Highest Ranking"
00MX"Mixture"
00OR"Or"

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    Page last Modified: March 04, 2005.
Degrib Questions? Arthur Taylor
NDFD Questions? nws.ndfd@noaa.gov
XML Questions? Paul Hershberg & John Schattel
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