SMI South Central (Smoke Management Instructions) Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Monday, September 27, 2010       2:40 PM      Jim Little



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


High pressure remains over the region for fair skies and warm temperatures and relatively light winds aloft.  The high is centered to the south of the Pacific Northwest and to the west, over the ocean, flow is southwesterly.  Full sunshine will give warm afternoon temperatures which will push mixing heights high enough for generally good smoke dispersal conditions.
    EXTENDED OUTLOOK (WEDNESDAY - THURSDAY)
The ridge aloft builds Wednesday and mixing heights will decrease somewhat.  Smoke dispersal conditions remain fair to good, however.  On Thursday a disturbance embedded in the southwesterly flow aloft offshore turns higher level winds more southwesterly.  This should have little effect on weather in south central Oregon. By Friday the disturbance is in Canada.  High pressure remains over the region for fair skies and above average temperatures.

2.  DISPERSION



TUESDAY

Mixing height 2600 - 3600 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind S to SW at 5 - 9 mph during the morning.  Transport wind shifts to WSW to WNW at 8 - 12 mph during the afternoon and shifts to NW to NNW at 8 - 12 mph during the evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SW to WNW at 6 - 10 mph during the afternoon then becomes light and variable during the evening.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



THURSDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 4 - 8 mph during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind WSW to WNW at 4 - 8 mph.



FRIDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning and through the afternoon.  Transport wind WSW to NW at 4 - 8 mph.  Surface wind WSW to NW at 4 - 8 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 Tuesday, September 28, 2010.

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Avoid ignitions within 15 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.  Watch for shifting transport winds.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.



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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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