SMI West (Smoke Management Instructions) Western Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Thursday, May 6, 2010       2:30 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR THE WESTERN OREGON AREA FORECAST ZONES 601-623


FRIDAY
Clearing skies and light winds will lead to unseasonably cold early morning surface temperatures and inversions.  A weak upper-level disturbance, in a westerly flow aloft, is forecast to move onshore in the afternoon.  It will only be strong enough to produce widely scattered mountain showers in the afternoon.  However, it will force the weak thermal trough east of the Cascades.  North-northeasterly transport winds will turn onshore late in the day, especially south.

    OUTLOOK (SATURDAY-MONDAY)
A very flat and weak ridge will turn the flow aloft slightly northwesterly Saturday, with continued onshore flow at the transport level.  Morning marine clouds should give way to partly sunny skies with near normal temperatures.  Afternoon mixing should be fair to good.  Another upper-level trough will turn the flow aloft southwesterly Sunday with an increasing chance of showers, mainly across the southern districts.  Afternoon smoke dispersion should be fair to good with increasing onshore transport winds.  A stronger system will likely bring cool and showery weather, to all districts, Monday with snow levels dropping below 4000 feet.


2.  DISPERSION



Zone 601, 602, 603 and 612 (North Coast Range):



MORNING

Mixing height below 500 ft early rising to 1600 - 2600 ft by late morning.

Transport wind NNE to E at 5 - 9 mph.

Surface wind NNE to ENE at 5 - 9 mph.



AFTERNOON

Mixing height rising above 5000 ft.

Transport wind NNE to ENE at 5 - 9 mph.

Surface wind N to ENE at 4 - 8 mph.



EVENING

Mixing height lowers below 1000 ft after sunset.

Transport wind shifts to NW to N at 9 - 15 mph.

Surface wind shifts to NW to NNE at 4 - 8 mph.



Zone 605-611 (North Cascades):



MORNING

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.



AFTERNOON

Mixing height rising above 5000 ft.

Transport wind similar to morning.

Surface wind similar to morning.



EVENING

Mixing height lowers below 1000 ft after sunset.

Transport wind similar to afternoon.

Surface wind similar to afternoon.



Zone 615-620 (South Coast Range):



MORNING

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.



AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to WNW to NW at 8 - 14 mph.

Surface wind increases to WNW to NW at 8 - 14 mph.



EVENING

Mixing height lowers below 500 ft after sunset.

Transport wind W to NW at 8 - 12 mph.

Surface wind W to NW at 5 - 9 mph.



Zone 616-623 (South Cascades):



MORNING

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.

Transport wind SSE to SSW at 4 - 8 mph.

Surface wind SSE to SSW at 4 - 8 mph.



AFTERNOON

Mixing height rising above 5000 ft.

Transport wind shifts to W to NW at 6 - 10 mph.

Surface wind shifts to W to NW at 6 - 12 mph.



EVENING

Mixing height lowers below 500 ft after sunset.

Transport wind shifts to NW to N at 8 - 14 mph.

Surface wind NW to N at 6 - 12 mph.



OUTLOOK:



SATURDAY

In the north mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNW at 8 - 14 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 4200 to 5000 ft by late morning and through the afternoon.  Transport wind NW to N at 6 - 10 mph.  Surface wind NW to N at 4 - 8 mph during the morning becoming NW to NNW at 8 - 14 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to NW at 6 - 12 mph.  Surface wind W to NW at 6 - 10 mph.



3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA

These instructions are valid for burning conducted on Friday, May 7, 2010.

=================================================================



Coast Range



Zone 601, 602, 603, 612, and 618

Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of coastal SSRAs.



Zone 615

Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



Zone 616 west of R8W

Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.



Zone 619

Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



Zone 620

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T35S.  Call the forecaster.





Cascades



Zone 605 and 606

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



Zone 607, 608, and 620

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



Zone 609, 610, and 611

Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



Zone 616, 617, 622, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.





Siskiyous

Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.



==============================================================

4.  SPECIAL NOTE:



    Call the smoke management duty forecaster at (503) 945-7401 to

    discuss burning.  Please do not call individual's numbers to

    discuss daily burning.  If the forecaster is not available,

    leave a message and he will return your call as soon as possible.

    Avoid calling between 2 to 2:30 p.m.



    The forecast is available on the Internet at:

      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management



    Please ensure your units have been planned and accomplished by checking:

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





5.  STANDARD GUIDANCE MATRIX:



  * Greater than 5000 ft mixing height:  No burning within 5 miles of

    downwind SSRA.  Maximum 100 tons per mile from downwind SSRA.

    Example:  500 ton maximum allowed if burned 5 miles from downwind SSRA.



  * 3000 - 5000 ft mixing height:  No burning within 10 miles of

    downwind SSRA.  Maximum 75 tons per mile from downwind SSRA.

    Example:  750 ton maximum allowed if burned 10 miles from downwind SSRA.



  * Less than 3000 ft mixing height:  No burning within 15 miles of

    downwind SSRA.  Maximum 50 tons per mile from downwind SSRA.

    Example:  750 ton maximum allowed if burned 15 miles from downwind SSRA.



  * All exceptions must be coordinated with the duty forecaster

    prior to ignition.

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