| Weather Type Codes
|
Meaning
|
| <NoWx> |
No weather expected.
No rain, snow, fog, etc. |
<Iso T>,
<Iso –TRW> |
Isolated thunderstorms expected, covering
about 10-25% of the area. Implies thunderstorms
will occur. |
<Sct T>,
<Sct –TRW> | Scattered thunderstorms expected,
covering
25-50% of the area. Implies
thunderstorms will occur.
|
<Num T>,
<Num –TRW> | Numerous thunderstorms expected, covering 50-75% of the area. Implies thunderstorms will occur. |
| <Iso –RW> | Isolated showers, covering 10-25% of the area. Implies showers will occur. |
| <Sct –RW> | Scattered showers, covering 25-50% of the area. Implies showers will occur. |
| <Num –RW> | Numerous showers, covering 50-75% of the area. Implies showers will occur. |
| <Wide –RW> |
Widespread showers, covering greater than 75% of the area. Implies showers will occur. |
<Schc T>,
<Schc –TRW> | A slight chance of thunderstorms, 10-25% chance of thunderstorms occurring. Implies uncertainty on whether or not thunderstorms will occur. |
<Chc T>,
<Chc –TRW> | A chance of thunderstorms, 25-50% chance of thunderstorms occurring. Implies uncertainty on whether or not thunderstorms will occur. |
<Lkly T>,
<Lkly –TRW> | Thunderstorms are likely, 50-75% chance of thunderstorms occurring. Implies uncertainty on whether or not thunderstorms will occur. |
| <Schc –RW> | A slight chance of showers, 10-25% chance of showers occurring. Implies uncertainty. |
| <Chc –RW> |
A chance of showers, 25-50% chance of showers occurring. Implies uncertainty. |
| <Lkly –RW> |
Showers are likely, 50-75% chance of showers occurring. Implies uncertainty. |
| <Iso –SW> |
Isolated snow showers, covering 10-25% of the area. Implies showers will occur. |
| <Sct –SW> |
Scattered snow showers, covering 25-50% of the area. Implies showers will occur. |
| <Num –SW> |
Numerous snow showers, covering 50-75% of the area. Implies showers will occur. |
| <Wide –SW> |
Widespread snow showers, covering greater than 75% of the area. |
| <Schc –SW> |
A slight chance of snow showers, 10-25% chance of showers occurring. Implies uncertainty. |
| <Chc –SW> |
A chance of snow showers, 25-50% chance of showers occurring. Implies uncertainty. |
| <Lkly –SW> |
Snow showers are likely, 50-75% chance of showers occurring. Implies uncertainty. |
<Schc –R, R>,
<Schc –S, S> |
A slight chance of rain (snow), 10-25% chance of rain (snow) occurring. |
<Chc –R, R>,
<Chc –S, S> |
A chance of rain (snow), 25-50% chance of rain (snow) occurring. |
<Lkly –R, R>,
<Lkly –S, S> |
Rain (snow) is likely, 50-75% chance of rain (snow) occurring. |
<Def –R, R>,
<Def –S, S> |
Rain or snow, greater than 75% chance of occurring. |
| <Areas BD> |
Areas of blowing dust. |
| <Patchy F> |
Localized areas of fog. |
| <Areas F> |
Areas of fog, more widespread than patchy. |
| <Areas ZF> | Areas of freezing fog. |
| <Areas K> | Areas of smoke. |
|
|