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, May 11, 2009       2:40 PM      Jim Little

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

A fairly deep upper low for this time of year will move west to east across Washington on Tuesday.  The associated cool upper trough sweeps across Oregon during the day.  While most of the moisture will remain to the north I can't rule out the possibility of widely scattered showers.  Low level flow will be west to northwest.  The cool air aloft will keep mixing heights high for good to excellent smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY):

The area will see weak ridging early then a weak upper trough will move through overnight Wednesday.  While the upper trough is weak at there will be plenty of moisture available for a good wetting rain.  Rain will spread into the region late Wednesday.  Transport winds will be south-southeast to south-southwest.  Mixing heights will remain favorable for good smoke dispersal.  The trough pushes east on Thursday and higher pressure begins to build.  Showers will end.  By Friday ridging aloft will give dry weather to the region.  Mixing heights will deteriorate somewhat Friday but still high enough for good smoke dispersal.

2.  DISPERSION

TUESDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3600 - 4600 ft during the evening.

Transport wind W to WNW at 14 - 28 mph during the morning and afternoon.  Transport wind decreases to WNW to NNW at 10 - 18 mph during the evening.

Surface wind WSW to WNW at 10 - 16 mph.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 2900 - 3900 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SE to S at 8 - 12 mph during the morning becoming SW to W at 15 - 29 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to W at 15 - 25 mph during the afternoon.

THURSDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to W at 10 - 22 mph during the morning becoming WNW to NNW at 10 - 18 mph during the afternoon.  Surface wind WSW to W at 10 - 22 mph during the morning becoming WNW to NNW at 10 - 16 mph during the afternoon.

FRIDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 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 Tuesday, May 12, 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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