SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Friday, October 1, 2010       2:40 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625


SATURDAY


The strong upper-level ridge over the Pacific Northwest will weaken and continue to slowly shift eastward, with the ridge axis over Idaho and western Montana.  Transport winds will remain light with warm air aloft continuing to suppress mixing heights.  Ventilation conditions will be marginal.  Overnight inversions will trap smoke near the ground.



OUTLOOK (SUNDAY-TUESDAY)



The upper-level ridge will shift into Wyoming and eastern Montana by Sunday, with increasing southwesterly flow aloft. The surface thermal trough will progress eastward, into Idaho.  Increasingly onshore transport winds and cooling aloft will improve ventilation conditions Sunday afternoon.  Some elevated instability may trigger showers or thunderstorms.



As an upper-level trough moves onshore, scattered showers should spread across the region Sunday night and Monday.  Daytime temperatures will dramatically cool, on Monday, with brisk northwesterly transport winds and good ventilation conditions.



Transport winds are forecast to turn northerly by Monday night, and northeasterly on Tuesday, as a ridge of high pressure begins building back over the west coast.  Inversions are likely Tuesday morning with some sunshine providing enough warming for good afternoon mixing.



2.  DISPERSION



SATURDAY

Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 2700 - 3700 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph during the morning becoming SSW to WSW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 6 - 10 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 8 - 12 mph during the morning becoming NW to N at 9 - 15 mph during the afternoon.  Surface wind WSW to NW at 4 - 8 mph during the morning becoming NW to N at 6 - 10 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 3700 - 4700 ft during the afternoon.  Transport wind NNE to NE at 9 - 15 mph.  Surface wind N to NE at 5 - 9 mph.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Saturday and Sunday, October 2 and 3, 2010.

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For Saturday:



Avoid ignitions within 20 miles 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.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



For Sunday:



Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the S through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the S through NW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



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4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)

    945-7401.  The smoke management forecaster is available

    to discuss specific burns.  The duty forecaster phone

    number is (503) 945-7401. Please call this number and

    not individual's numbers to discuss daily burning. Please

    avoid calling before 8 a.m. and between 2 to 3 p.m.



    This 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

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