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: Thursday, May 6, 2010       2:40 PM      Pete Parsons



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


    FRIDAY
Clearing skies and light offshore winds will lead to another unseasonably cold early morning with inversions.  A weak upper-level disturbance, in a westerly flow aloft, is forecast to move onshore in the afternoon.  It will bring some clouds in the afternoon but also shift the surface thermal trough into south-central Oregon.  Mixing should be good, but watch for southeasterly transport winds to possibly become westerly or northwesterly during the mid to late afternoon.

    OUTLOOK (SATURDAY-MONDAY)
The weak upper-level trough/surface thermal trough couplet will continue east Saturday with good mixing and increasing northwesterly transport winds. Skies should mostly be partly cloudy with near normal temperatures and very limited mountain shower activity.  Another upper-level trough will turn the flow aloft southwesterly Sunday with an increasing chance of showers.  Afternoon mixing should be good with continued northwesterly transport winds.  A stronger system will likely bring much cooler and showery weather Monday with snow levels dropping to near 4000 feet.


2.  DISPERSION



FRIDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 5 - 9 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WNW to NNW at 5 - 9 mph during the afternoon then becomes light and variable during the evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind WNW to NNW at 4 - 8 mph during the morning becoming WNW to NNW at 10 - 16 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 6 - 10 mph.  Surface wind NW to N at 6 - 10 mph.



MONDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 8 - 12 mph during the morning becoming WNW to NNW at 10 - 18 mph during the afternoon.  Surface wind W to NW at 8 - 12 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 Friday, May 7, 2010.

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Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



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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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