SMI South Central (Smoke Management Instructions) South Central Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, May 26, 2009       2:40 PM      Jim Little

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

The jet stream shifts northward on Wednesday as high pressure builds aloft.  Dry weather will prevail across the entire Pacific Northwest.  Temperatures should be up about five degrees from Tuesday.  Mixing heights will be high and smoke dispersal conditions will be good to excellent, but nighttime inversions will hold residual smoke close to the ground.

    OUTLOOK (THURSDAY-SATURDAY)

The upper level high pressure area continues to build.  The high center will be over the Great Basin and clockwise flow around the high could bring some moisture north for the possibility of afternoon or early evening thunderstorms Thursday and Friday, mainly over mountainous areas.  Mixing heights will remain favorable for good smoke dispersal conditions. A weather system moving across British Columbia flattens the ridge Friday and turns upper flow more southwesterly with lessons the chance for thunderstorms.

2.  DISPERSION

WEDNESDAY
Mixing height 2300 - 3300 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to NW to NNW at 10 - 22 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WNW to NNW at 6 - 12 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ENE to ESE at 5 - 9 mph during the morning becoming SW to W at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 6 - 10 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Wednesday, May 27, 2009.
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Avoid ignitions within 15 miles to the W through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the W through ENE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

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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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