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: Sunday, April 25, 2010       2:40 PM      Jim Little

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

    MONDAY

The upper ridge that brought sunshine to much of the state Sunday moves east and an upper trough rotates into the Pacific Northwest during the day.  A surface cold front reaches the coastline during the day.  Expect one more dry day before precipitation moves in on Tuesday.  Models show strong southerly transport winds and high mixing heights for good smoke dispersal conditions.

    OUTLOOK (TUESDAY-THURSDAY)

The upper trough continues on an axis from south of Kodiak, Alaska to northwestern Nevada on Tuesday.  There will be showers during the day. Maximum mixing heights remain generally above 5000 feet for good smoke dispersal conditions. By Wednesday the upper trough splits and a portion moves east.  Minor ridging develops aloft, but not enough to end the showers.  Maximum mixing heights again climb to over 5000 feet for continued good smoke dispersal conditions.  Thursday sees southwesterly flow aloft. A minor disturbance embedded in that flow moves toward the Pacific Northwest but won't reach the area until Thursday.  Look for showers Thursday then a renewed surge of moisture on Friday.  Thursday and Friday maximum mixing heights will be above 5000 feet.

2.  DISPERSION

MONDAY

Transport wind SSW to SW at 19 - 33 mph during the morning.  Transport wind increases to SSW to SW at 24 - 42 mph during the afternoon and increases to SSW to SW at 30 - 50 mph during the evening.

Surface wind SSW to SW at 13 - 25 mph.


OUTLOOK:

TUESDAY
Mixing height 2400 - 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 22 - 40 mph during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.  Surface wind SSW to SW at 13 - 25 mph during the morning becoming WSW to WNW at 6 - 10 mph during the afternoon.

WEDNESDAY
Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
Mixing height 2000 - 3000 ft during the morning rising to 4000 - 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 Monday, April 26, 2010.
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Avoid ignitions within 10 miles to the SSW through SW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  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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