SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, April 10, 2026 2:30 PM Sherri Pugh

1. DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 637-646

Rounds of showers on Saturday will bring up to 0.20” rainfall amounts with some chance of thunderstorms. Flow aloft will come from S with one upper-level low weakening and another one offshore of California. Winds will be brisk from SSW. Temperatures cool some but stay above average. Mixing heights will be excellent.

Rain continues on Sunday with amounts from 0.10-0.50”. Snow levels will drop to near 5000 feet with mountain snow likely. Flow aloft will be light with the upper-level low moving into California. Temperatures will be seasonable and mixing heights will be good. Winds will come from S-W, lighter for northeastern zones.

EXTENDED DISCUSSION

Showers will end late on Monday with amounts under 0.25”. Flow aloft will be light from NW with broad upper-level ridging. Winds will be from W-WNW and temperatures will drop below seasonable. Mixing heights will rise high.

Tuesday will have a break in the rain before more arrives late. Another upper-level low will dig south toward Oregon with W flow aloft. Surface winds will be from SW and transport winds are expected from SW-WSW. Seasonable temperatures will come with good mixing heights.

2. DISPERSION

SATURDAY

Zone 640, 642, and 644 West of R35E:

Mixing height below 2000 ft early rising to 3500 - 4500 ft by late morning. Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.

Transport wind S to SW at 9 - 15 mph.

Surface wind S to SW at 4 - 8 mph during the morning and afternoon. Surface wind becomes light and variable and controlled by local terrain during the evening.

Zone 637, 643, 645, 646, and 644 East of R34E:

Mixing height below 1500 ft early rising above 5000 ft by late morning. Mixing height lowers below 1000 ft during the evening.

Transport wind S to SW at 10 - 18 mph during the morning and afternoon. Transport wind decreases to S to SW at 6 - 10 mph during the evening.

Surface wind S to SW at 4 - 8 mph during the morning and afternoon. Surface wind becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon. Transport wind light and variable during the morning becoming SW to WNW at 4 - 8 mph during the afternoon. Surface wind light and variable.

MONDAY

Mixing height 2900 to 3900 ft during the morning rising to 4000 to 5000 ft during the afternoon. Transport wind WSW to WNW at 10 - 22 mph. Surface wind WSW to WNW at 4 - 8 mph.

TUESDAY

Mixing height 3000 to 4000 ft throughout the day. Transport wind WSW to WNW at 8 - 12 mph during the morning becoming SSW to WSW at 10 - 18 mph during the afternoon. Surface wind SSW to WSW at 4 - 8 mph.

3. BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 637-646

- Valid for burning done Saturday through Monday, April 11 through 13, 2026.

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For Saturday:

Zone 640, 642, and 644 West of R35E:

Follow standard guidance matrix - see section 5 below - for burning units to the S through SW of SSRAs. For units that will smolder significantly through the night avoid burning within at least 15 miles to the ESE through SW in or near drainages leading to SSRAs. No additional restrictions necessary.

Zone 637, 643, 645, 646, and 644 East of R34E:

For Sunday:

Follow standard guidance matrix - see section 5 below - for burning units in all directions of SSRAs. No additional restrictions necessary.

For Monday:

Follow standard guidance matrix - see section 5 below - for burning units to the W through NW of SSRAs. For units that will smolder significantly through the night avoid burning within at least 15 miles to the SW through NW in or near drainages leading to SSRAs. No additional restrictions necessary.

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4. SPECIAL NOTE:

The ODF forecast smoke zones differ from the NWS fire zones and

are available at:

https://www.oregon.gov/odf/fire/documents/smoke-forecast-zone-map.pdf

The smoke management forecaster is available at (503)-

945-7401. Please call this number and not individual's

numbers to discuss daily burning. For large burns (over

2000 tons) or burns extending over a considerable period,

please request a special forecast. Avoid calling

between 1:30 to 2:45 p.m.

http://www.odf.state.or.us/DIVISIONS/protection/fire_protection/

Daily/neo.htm

To subscribe to or unsubscribe from the email list for this

product, please go to the link:

http://weather.smkmgt.com/mailman/listinfo/

Please ensure your units have been planned and accomplished by

checking: http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml

A map of planned and/or accomplished burns is located at:

http://geo.maps.arcgis.com/apps/webappviewer/index.html

?id=a7e321dc8fc444b7a33fbc67bc673a3b

5. STANDARD GUIDANCE MATRIX:

* Greater than 5000 ft mixing height: Limit to 150 tons per mile

from downwind SSRAs.

Example: 75 tons allowed if burned a half mile from a downwind

SSRA.

* 3000 - 5000 ft mixing height: Limit to 50 tons per mile if

burning within 5 miles of downwind SSRAs. Limit to 100 tons

per mile if burning 5 miles or beyond downwind SSRAs.

Example #1: 200 tons allowed if burned 4 miles from a downwind

SSRA.

Example #2: 500 tons allowed if burned 5 miles from a downwind

SSRA.

* Less than 3000 ft mixing height: No burning within 5 miles of

downwind SSRAs. Limit to 60 tons per mile from downwind SSRAs.

* Ensure adequate spacing between units when burning near downwind

SSRAs.

* Use of polyethylene (PE) sheeting on greater than 75 percent of

piles in a unit with 60 percent coverage per pile will allow a

50 percent increase in tonnage over the existing instruction tonnage

for that zone.

* All exceptions must be coordinated with the duty forecaster

prior to ignition.

6. BURN MONITORING:

Burns over 2000 tons must be monitored (OAR 629-048-0230(3) -

7/1/14). Monitoring of all burns is highly recommended for both

smoke management purposes and wildfire potential.