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 9, 2009       2:40 PM      Nick Yonker

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

Upper level ridge is building over the state today and will be at its peak Sunday morning.  Then it gets shoved eastward by a trough and minor frontal system.  This will set off a marine push over the region Sunday afternoon to evening.  Air mass will be stable during the morning then destabilize well during afternoon heating.  Wind flow will be fairly light during the morning, and then increase from the SW during the afternoon.  Smoke dispersion will improve throughout the day.

    OUTLOOK (MONDAY - WEDNESDAY):

Ridge gives way to an upper trough and dry cold front Monday morning.  The upper trough will move by to the east Tuesday.  Temperatures will be cool with brisk westerly flow.  Air mass will destabilize quickly Monday and remain unstable through Tuesday.  Weak ridging moves in Wednesday but will be overridden by the next front during the later afternoon.  Expect mostly good to excellent smoke dispersion through the period.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.

Transport wind SE to S at 8 - 14 mph during the morning.  Transport wind shifts to SW to W and increases to 10 - 20 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SW to W at 10 - 18 mph during the afternoon and evening.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 10 - 20 mph.  Surface wind SW to W at 6 - 10 mph during the morning becoming WSW to WNW at 12 - 22 mph during the afternoon.

TUESDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 15 - 30 mph.  Surface wind WSW to WNW at 10 - 20 mph during the morning becoming WNW to NW at 12 - 24 mph during the afternoon.

WEDNESDAY
Mixing height 2500 - 3500 ft during the morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SSE to SSW at 9 - 15 mph during the morning becoming SW to WSW at 12 - 22 mph during the afternoon.  Surface wind SSE to SSW at 8 - 12 mph during the morning becoming WSW to WNW at 10 - 18 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 Sunday, May 10, 2009.
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Avoid ignitions within 12 miles to the SE through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SE through WNW in or near drainages leading to SSRAs.  Watch for shifting transport winds.

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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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