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, May 28, 2010       2:40 PM      Pete Parsons



PLEASE NOTE:  SMOKE MANAGEMENT FORECASTS WILL NOT BE ISSUED ON SUNDAY, MAY 30TH, IN HONOR OF MEMORIAL DAY, AND NO FORECASTER WILL BE AVAILABLE. SMOKE MANAGEMENT FORECASTS WILL RESUME ON MONDAY, MAY 31ST.



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


   SATURDAY

As a strong upper-level trough finally exits to the east, it will rotate one last disturbance southward across northern and eastern Oregon.  Showers should stay north of the district with partly to mostly sunny skies.  After a cold start, with low-level temperature inversions, warmer afternoon temperatures will make for fair to good daytime smoke dispersal conditions.  A drier northwesterly flow aloft will clear skies by evening.  Low-level overnight temperature inversions could trap residual smoke near the ground.

    OUTLOOK (SUNDAY-TUESDAY)

A transitory and weak upper-level ridge is forecast to move over the region Sunday morning and then push into eastern Oregon Sunday afternoon.  Increasing westerly flow aloft will bring clouds, from a weak weather system, into the region by Sunday night.  Monday looks mostly cloudy with a slight chance of showers.  A flat upper-level ridge will bring some clearing and warming on Tuesday.  Daytime smoke dispersal conditions should remain fair to good throughout the period.


2.  DISPERSION



SATURDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind NW to NNE at 4 - 8 mph.



Surface wind NNW to NE at 4 - 8 mph.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.  Surface wind SSW to WSW at 4 - 8 mph during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.



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, May 29, 2010.

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Avoid ignitions within 12 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Complete ignitions by 5 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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