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: Sunday, May 16, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level disturbance will move into northern California during the day and upper flow shifts from southwesterly to southerly.  This will push more moisture into the Pacific Northwest.  Daytime heating destabilized the atmosphere and afternoon showers are likely with possible thunderstorms.  Expect high mixing heights for good smoke dispersal conditions.

    OUTLOOK (TUESDAY-THURSDAY)

An upper level low in the Gulf of Alaska keeps southwesterly flow aloft over the region for Tuesday.  There will be enough moisture for widely scattered showers.  Smoke dispersal conditions should be good.  Look for dry weather on Wednesday until mid afternoon when moisture from a Pacific system crosses the Cascades and spreads east.


2.  DISPERSION

MONDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 1900 ft during the evening.

Transport wind S to SSW at 12 - 22 mph during the morning.  Transport wind decreases to SSW to WSW at 10 - 16 mph during the afternoon and evening.

Surface wind S to SSW at 9 - 15 mph.

OUTLOOK:

TUESDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 10 - 20 mph.  Surface wind SW to WNW at 6 - 12 mph during the morning becoming W to NW at 8 - 14 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.  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, May 17, 2010.
    ==================================================================

Avoid ignitions within 12 miles to the SSE through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SSE through WNW in or near drainages leading to SSRAs.  No additional restrictions necessary.

    ==============================================================
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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