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: Monday, May 4, 2009       2:40 PM      Jim Little

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

An upper level low remains in the Gulf of Alaska on Tuesday with a strong west to east upper flow over the eastern Pacific and the Pacific Northwest.  Post frontal showers will continue throughout the day.  Maximum mixing heights will be above 5000 feet for good smoke dispersal conditions and transport winds will be generally southwesterly.

    OUTLOOK (WEDNESDAY-FRIDAY):

A slow moving Pacific cold front will move across the region on Wednesday for periods of rain throughout the day.  Mixing heights will remain high and transport winds will be southwesterly.  On Thursday a strong westerly flow aloft continues, while at the surface high pressure begins to build west of California.  The surface high will be too distant to have much effect on Oregon weather with scattered showers continuing.  By Friday the surface high will finally begin to nose into the Pacific Northwest cutting off showers.  Low level transport winds will finally shift to more northerly by Friday.  Smoke dispersal conditions remain good.

2.  DISPERSION

TUESDAY
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind SW to WSW at 18 - 32 mph during the morning and afternoon.  Transport wind decreases to SW to WSW at 12 - 22 mph during the evening.

Surface wind S to SW at 10 - 22 mph during the morning and afternoon.  Surface wind decreases to SSW to WSW at 10 - 16 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height 4000 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 16 - 26 mph during the morning becoming WSW to W at 19 - 33 mph during the afternoon.  Surface wind S to SW at 10 - 18 mph during the morning becoming WSW to W at 15 - 25 mph during the afternoon.

THURSDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 10 mph during the afternoon.

FRIDAY
Mixing height 3000 - 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNW at 8 - 14 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 Tuesday, May 5, 2009.
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Avoid ignitions within 12 miles to the SW through W of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.  Complete ignitions by 4pm

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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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