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: Tuesday, May 4, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level disturbance in the west-northwesterly flow aloft develops into a closed low over Washington by morning.  This should be far enough to the north that affects in south central Oregon will be minor. I can't rule out the possibility of some light rain or snow but amounts should be very light.  Mixing heights should be above 5000 feet for good smoke dispersal conditions with a generally northwesterly transport wind.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low moves east and weak ridging aloft develops over the area by Thursday.  The showers will end.  Maximum mixing heights will remain high but very light transport winds might limit burn opportunities.  Friday and Saturday will see light westerly flow aloft with dry conditions.  Winds will be generally southerly Friday.  By Saturday transport winds will be picking up from the northwest and maximum mixing height will remain high.  Clearing skies and nighttime inversions will hold any residual smoke close to the ground during the overnight period.


2.  DISPERSION

WEDNESDAY
Mixing height 2700 - 3700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3900 - 4900 ft during the evening.

Transport wind NNW to NNE at 8 - 14 mph during the morning.  Transport wind increases to NNW to N at 10 - 22 mph during the afternoon and evening.

Surface wind NNW to N at 8 - 12 mph during the morning.  Surface wind increases to NW to N at 10 - 18 mph during the afternoon then decreases to NW to NNE at 6 - 12 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height 3100 - 4100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NE at 6 - 12 mph during the morning becoming NNE to ENE at 6 - 10 mph during the afternoon.  Surface wind NNW to NNE at 4 - 8 mph during the morning becoming NNE to ENE 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 2600 - 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 4 - 8 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 5, 2010.
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Avoid ignitions within 10 miles to the NW through NNE of SSRAs.  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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