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: Monday, April 6, 2009       2:40 PM      Jim Little

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

The upper level ridge that moved over the region over the weekend will flatten and move to the east while an upper level low pressure area will move into central California on Tuesday. At the surface a thermal trough will shift inland.  Transport winds will initially be from the east but shift to westerly during the day.   Because of shifting winds recommend burning only units well away from populated areas.  Mixing heights should remain favorable for fair to good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY - FRIDAY):

The California upper low will shift into Nevada and Utah on Wednesday.  Expect some light rain most areas with this system for Wednesday.  Another weather system will spread more rain in again for Thursday and Friday.


2.  DISPERSION

TUESDAY
Mixing height 1300 - 2300 ft during the morning.  Afternoon and evening mixing rises to 3500 - 4500 ft.

Transport wind ESE to SSE at 6 - 10 mph during the morning.  Transport wind shifts to WSW to WNW and increases to 12 - 24 mph during the afternoon then increases to WNW to NW at 16 - 30 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SSE to SW at 6 - 12 mph during the afternoon then shifts to SW to W at 5 - 9 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning rising to 4400 - 5000 ft during the afternoon.  Transport wind WNW to NW at 12 - 22 mph.  Surface wind SSW to WSW at 6 - 12 mph during the morning becoming SW to W at 10 - 18 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 2800 - 3800 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SW to W at 5 - 9 mph during the morning becoming light and variable during the afternoon.  Surface wind SW to W at 5 - 9 mph during the morning becoming light and variable during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph.  Surface wind NW to N 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, April 7, 2009.
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Avoid ignitions within 12 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the N through NW in or near drainages leading to SSRAs.  Watch for shifting transport winds.  No additional restrictions necessary.

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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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