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, April 19, 2010       2:40 PM      Jim Little

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

Wednesday morning will see an upper level trough extending from the Gulf of Alaska southeastward to off the coast of California.  The south end of this trough cuts off as a closed low over California during the day.  A Pacific cold front moves in early dropping temperatures and keeping rain and snow showers going throughout the day.  Mixing heights will be quite high for good smoke dispersal conditions most areas.

    OUTLOOK (WEDNESDAY-FRIDAY)

An upper low over Nevada keeps circulating showers into the region on Wednesday.  Maximum mixing heights remain high for good smoke dispersal conditions.  On Thursday the upper low drifts southward but showers continue.  Mixing heights drop slightly but smoke dispersal conditions remain fair. Upper ridging develops over the Pacific Northwest on Friday for dry weather.

2.  DISPERSION

TUESDAY
Mixing height 1300 - 2300 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1600 - 2600 ft during the evening.

Transport wind SSW to WSW at 10 - 16 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to WNW to NW at 8 - 14 mph during the evening.

Surface wind SSW to WSW at 6 - 12 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon then increases to W to NNW at 5 - 9 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height 2900 - 3900 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to N at 21 - 37 mph during the morning becoming N to NNE at 25 - 45 mph during the afternoon.  Surface wind NNW to N at 10 - 22 mph.

THURSDAY
Mixing height 1800 - 2800 ft during the morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4500 - 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 Tuesday, April 20, 2010.
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Avoid ignitions within 12 miles to the SSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles in all directions 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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