SILVERTON HILLS FIELD BURNING FORECAST
OREGON DEPARTMENT OF FORESTRY WEATHER OFFICE
8:45 AM PDT WED SEPT 30, 2026
BURN ADVISORY:
Agricultural burning is not recommended.
Prep burning is not allowed.
(See “Notes” below for difference between field burning
and Agricultural burning)
Partly sunny and dry, winds from S-SW at 7-9 mph.
Salem's high temperature today will be near 72°F (average is 73°F).
Relative humidity: Near 75% this morning; near 55% by late afternoon
Surface winds: N-NNE 7-9 mph this morning; N 7-9 mph this afternoon
Transport winds: N-NNE 8-10 mph this morning; N 8-10 mph this afternoon
Mixing height: Near 3000 feet by 1 p.m.; 3200 feet by 5 p.m.
Salem’s sunset tonight: 6:54 p.m.
(Salem Airport data for Tuesday, September 29th: High 73°F; Rainfall: 0.0”)
(Maximum Ventilation Index expected today: 32)
EXTENDED DISCUSSION:
Temperatures will warm above average with upper-level ridging. Dry skies will come with NNW-N winds.
The National Weather Service’s digital forecast is available at:
Notes:
1. Mixing height, as used here, is the lowest height at which the
potential temperature exceeds the potential temperature at the
surface. As a practical matter it is the approximate height to
which a smoke plume will rise assuming good ignition, dry fuels,
and winds less than about 15 mph.
2. Transport winds are a layer average through the mixing height,
weighted slightly toward the winds at the top of the layer.
3. Ventilation Index is the height of the mixing layer (ft) times
the transport wind speed (mph) divided by 1000.
4. Surface wind direction is the general expected wind direction.
At a specific point surface winds are highly dependent on local
terrain conditions.
5. In accordance with OAR 837-110-0090, all field burning shall be
banned when any two of the following criteria are present:
A. Temperature of 95 degrees Fahrenheit or above
B. Relative humidity of 30 percent or below
C. Wind speed of 15 miles per hour or higher
6. Agricultural burning: Burning of any agricultural waste generated
by an agricultural operation that uses or intends to use land
primarily for the purpose of obtaining profit by raising,
harvesting, and selling crops or animals. Prohibited materials
such as tires cannot be burned, even in an agricultural setting.
If you make your primary living from an agricultural operation,
you are considered an agricultural operator and can agricultural
burn. If you don't make your primary living from the agricultural
operation, you are a backyard burner and subject to the rules of
backyard burning. Contact your local fire district for
information about backyard burning.
7. Open field burning: Burning of any grass seed or cereal grain
crops, or associated residue, including steep terrain and species
identified by the Director of Agriculture, or any “emergency” or
“experimental” burning (ORS 603-077-0105(29)).
8. Preparatory (prep) burning: A type of field burning where
controlled burning of portions of selected fields is conducted
for the specific purpose of reducing the fire hazard potential
or other conditions which would otherwise inhibit rapid ignition
burning when the field is subsequently open burned
(ORS 603-077-0105(34)).
9. Test fires: A type of field burning where individual field burns
are specifically authorized by the Department for the purpose of
determining or monitoring atmospheric dispersion conditions (ORS
603-077-0105(54)).
This forecast is provided under an agreement between the Oregon Department
of Agriculture (ODA) and the Oregon Department of Forestry (ODF). For
information contact ODA at 503-986-4701.
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email address from this list, please go to:
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Sherri Pugh
ODF Meteorologist