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 7, 2010       2:40 PM      Pete Parsons



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


    SATURDAY
The unseasonably cold air mass, from earlier this week, has moderated, with temperatures returning to near normal.  Only brief morning inversions are likely, with good ventilation conditions from late morning through the afternoon.  The flow aloft will be westerly with a couple of upper-air disturbances possibly triggering a few showers, mainly over the mountains.  Northwesterly transport winds will increase in the afternoon, as the surface thermal trough shifts from central Oregon into Idaho.

   OUTLOOK (SUNDAY-TUESDAY)
Another upper-level trough will move across southern Oregon and northern California on Sunday.  Scattered showers are likely with a chance of thunderstorms.  Mixing should be fair to good from the late morning through the afternoon with generally westerly transport winds.  A cold upper-level trough will move over Oregon Monday with showery weather.  Snow levels will drop to near 5000 feet.  Showers will likely linger into Tuesday with a drier northerly flow aloft forecast by Tuesday afternoon.


2.  DISPERSION



SATURDAY

Mixing height below 500 ft early rising above 5000 ft by late morning.  Mixing height lowers to 3000 - 4000 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NW to NNW at 8 - 12 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 6 - 10 mph during the afternoon and evening.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 2500 - 3500 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 W to NW at 6 - 12 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph.  Surface wind W to NW at 8 - 12 mph.



TUESDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNW at 15 - 25 mph during the morning becoming NW to N at 10 - 18 mph during the afternoon.  Surface wind NNW to NNE at 10 - 16 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, May 8, 2010.

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Avoid ignitions within 10 miles to the WSW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WSW through N in or near drainages leading to 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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