| Prep
Burning |
|
|
|
| Fire |
|
|
|
| (≥95°, ≥15mph, ≤30% RH) |
|
|
|
|
|
|
| Relative
Humidity above |
|
| 60%
all day? |
|
|
|
|
|
|
|
|
|
|
|
| Portland |
|
| Clean
Air Action |
|
| Day? |
|
|
|
|
|
|
| Political |
|
| Considerations? |
|
| (Holiday, Weekend, etc) |
|
|
|
|
|
|
| Mixing |
|
| Height |
|
| Stays
below 3000'? |
|
|
|
|
|
| Prep |
No
Prep Burning |
|
| Burning
Allowed |
|
|
| Start latest of |
|
| 3000' mixing height
reached |
|
| RH ≤ 60% |
|
| Winds below 15kts |
|
| 11am (Fudge to 11am if possible |
|
|
for burn opportunities at higher humidities) |
|
|
| End
earliest of |
|
| Mixing height goes
below 3000' |
|
| RH drops below 30%
or goes above 60% |
|
| Winds go above 15kts |
|
| 2pm (or 5pm if there
is no possibility of open burning) |
|
| Mixing
Height 3-5000' 100ac limit |
|
| Mixing
Height ≥5000' 200ac limit |
|
|
| Note: End time can be extended at noon if
anticipated |
|
| open field burning gets
canceled |
|
|
| Note: No weekend prep burning |
|
|
|
|
|
|
|