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: Saturday, May 16, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will remain strong over the region through tomorrow providing probably the warmest temperatures of the year.  Air mass will remain stable with a brief period of good mixing during maximum afternoon heating.  Wind flow will be rather light and variable leading to mostly poor to fair smoke dispersion.

    OUTLOOK (MONDAY - WEDNESDAY):

Upper ridge will shift to the east on Monday as an upper trough and minor front approach.  Marine push will move in during the afternoon, cooling down the very warm temperatures.  Trough and front move in Tuesday providing cooler and breezy conditions.  Air mass destabilizes and dispersion improves under the brisk onshore flow.  Trough moves to the east Wednesday with a flat ridge replacing it.  Wind flow turns northerly again.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 1300 - 2300 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind ESE to SSE at 4 - 8 mph during the morning.  Transport wind shifts to SW to W and increases to 6 - 12 mph during the afternoon then shifts to NW to N at 8 - 14 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 - 12 mph during the afternoon then shifts to WNW to NNW at 6 - 10 mph during the evening.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SE to SSW at 5 - 9 mph during the morning becoming SW to WSW at 12 - 24 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to WSW at 9 - 15 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SW to W at 15 - 25 mph during the morning becoming W to NW at 15 - 30 mph during the afternoon.  Surface wind SW to W at 10 - 16 mph during the morning becoming W to NW at 10 - 22 mph during the afternoon.

WEDNESDAY
Mixing height 3000 - 4000 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 10 mph.  Surface wind NNW to NNE 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 Sunday, May 17, 2009.
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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.

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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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