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 27, 2009       2:40 PM      Jim Little

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

An upper level disturbance dropping southward from British Columbia on Monday will develop into an upper level low over the Pacific Northwest on Tuesday.  This will produce periods of rain throughout the day for most of the area.  The rain will taper off later in the day, but showers are likely through Wednesday.  With the cooler air aloft the atmosphere will be rather unstable and mixing heights should be favorable for good smoke dispersal.  Expect transport winds to be generally from the west-southwest.

    OUTLOOK (WEDNESDAY - FRIDAY):

The upper low drifts slowly eastward across the state on Wednesday.  Showers will continue throughout the day.  Mixing heights will remain high, transport winds generally north through northeast.  By Thursday the upper low will pass to the east allowing weak ridging to build over the area.  Weather should be dry. Transport winds northwesterly.  On Friday a Pacific weather system moves toward the state from the southwest.  Rain will spread northeastward during the afternoon and a wet weekend is in store.

2.  DISPERSION

TUESDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3200 - 4200 ft during the evening.

Transport wind W to NW at 10 - 20 mph.

Surface wind SW to WSW at 9 - 15 mph.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.

THURSDAY
Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 5 - 9 mph during the morning becoming NW to NNW at 10 - 20 mph during the afternoon.  Surface wind WNW to NNW at 5 - 9 mph during the morning becoming NW to NNW at 10 - 20 mph during the afternoon.

FRIDAY
Mixing height 2500 - 3500 ft during the morning rising above 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 28, 2009.
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Avoid ignitions within 10 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.

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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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