SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

 

ISSUED: Monday, December 5, 2022 2:30 PM Sherri Pugh

 

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* Special Protection Zone (SPZ) provisions apply from November 15 through February 15. Prescribed burning is not allowed on Red woodstove days in an SPZ from December 1 through February 15. Burning is allowed inside of SPZs on green and yellow woodstove days, but please use extra precautions and limit forestland burning to units that will not worsen air quality within nearby SSRAs. *

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

 

SHORT-TERM DISCUSSION

Winds aloft turn weakly from the NW with dry weather and partly cloudy to mostly cloudy skies on Tuesday. Mixing heights will be fair with snow levels at 3-4000 feet. Surface winds come from S-SW and transport winds come from SSW-WSW. Temperatures will be a few degrees below average.

EXTENDED DISCUSSION

Skies turn mostly sunny on Wednesday with a short-wave ridge and weak NW to W flow aloft. Light surface winds will be from the S with SSW-SW transport winds. Mixing heights and snow levels stay similar to Tuesday. Temperatures remain below average.

A new system increases the potential for mountain snow and a rain/snow mix on Thursday. A short-wave upper-level trough will bring increased SW winds aloft and less than 0.25 rainfall. Surface winds come from S in central Oregon and SSE in northeastern Oregon. Transport winds increase from SSW. Snow levels drop to near 3000 feet with fair mixing heights.

Skies stay mostly cloudy on Friday with W flow aloft and more potential for precipitation. Winds turn from SSE-S. Mixing heights improve some with snow levels under 3000 feet.

 

2. DISPERSION

 

TUESDAY

 

Zone 640, 642, and 644 West of R35E:

Mixing height below 500 ft early rising to 1000 - 2000 ft by late morning. Afternoon mixing height rises to 2300 - 3300 ft then lowers below 1000 ft during the evening.

 

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

 

Surface wind light and variable and controlled by local terrain during the morning. Surface wind increases to SSW to WSW at 4 - 8 mph during the afternoon and evening.

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

Mixing height below 800 ft during the morning rising to 1000 - 2000 ft during the afternoon lowering below 1000 ft during the evening.

 

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

 

Surface wind light and variable and controlled by local terrain.

 

OUTLOOK:

 

WEDNESDAY

Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning and through the afternoon. Transport wind SSW to WSW at 4 - 8 mph. Surface wind light and variable.

 

THURSDAY

Mixing height 1000 to 2000 ft during the morning rising to 2000 to 3000 ft during the afternoon. Transport wind SE to S at 8 - 12 mph during the morning becoming S to SW at 10 - 18 mph during the afternoon. Surface wind ESE to S at 4 - 8 mph.

 

FRIDAY

Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning and through the afternoon. Transport wind SSE to SSW at 6 - 10 mph. Surface wind light and variable.

 

3. BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 637-646

- Valid for burning done Tuesday, December 6, 2022.

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Zone 640, 642, and 644 West of R35E:

Delay ignitions until 10 a.m. Follow standard guidance matrix - see section 5 below - for burning units to the SW through W of SSRAs. For units that will smolder significantly through the night avoid burning within at least 30 miles to the SSW through W in or near drainages leading to SSRAs. Complete ignitions by 3 p.m. No additional restrictions necessary.

 

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

Delay ignitions until 10 a.m. Follow standard guidance matrix - see section 5 below - for burning units in all directions of SSRAs. For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs. Complete ignitions by 3 p.m. No additional restrictions necessary.

 

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4. SPECIAL NOTE:

 

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.