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 19, 2009       2:40 PM      Jim Little

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

The upper level trough that brought rain to many parts of Oregon shifts to the east on Wednesday.  Weak ridging aloft moves in to ensure dry weather during the day.  Mixing heights should climb to above 5000 feet during the day for excellent smoke-dispersal conditions.  Night-time inversions will trap residual smoke in valleys and swales overnight.  Transport winds will be generally northeasterly.

    OUTLOOK (THURSDAY-SATURDAY):

Weak ridging aloft continues Thursday for dry weather.  Temperatures climb to above normal levels.  Afternoon mixing heights remain high for good to excellent smoke dispersal conditions.  Thursday transport winds begin as southerly but shift during the day to westerly.  Friday and Saturday a generally west-to-east flow in the upper atmosphere will prevail, but with minor impulses rippling past in the flow.  These could touch off afternoon or evening thunderstorms mainly over mountainous regions.  Smoke dispersal conditions remain good and winds will be generally west or northwesterly.

2.  DISPERSION

WEDNESDAY
Mixing height 3700 - 4700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2900 - 3900 ft during the evening.

Transport wind ENE to ESE at 8 - 14 mph during the morning and afternoon.  Transport wind increases to NE to E at 10 - 16 mph during the evening.

Surface wind SSE to SSW at 5 - 9 mph during the morning.  Surface wind shifts to SW to WSW and increases to 10 - 22 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 4300 - 5000 ft during the afternoon.  Transport wind E to SE at 6 - 10 mph during the morning becoming W to NW at 6 - 10 mph during the afternoon.  Surface wind SSW to SW at 9 - 15 mph during the morning becoming W to WNW at 12 - 24 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 10 - 20 mph during the afternoon.

SATURDAY
Mixing height 2800 - 3800 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N 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 Wednesday, May 20, 2009.
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Avoid ignitions within 10 miles to the ENE through ESE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the ENE through SE in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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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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