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: Tuesday, November 3, 2009       2:40 PM      Jim Little

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

The upper ridge that has brought pleasant fall weather to the region the past few days will be shifting eastward Wednesday.  By late afternoon the ridge axis will be on a line from Salt Lake City to eastern British Columbia.  This is a slightly faster eastward movement than was previously thought.  Mixing heights will be much higher than they have been in recent days.  Surface winds will be generally southerly with good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

On Thursday a major upper low will set up shop in the northern Gulf of Alaska.  This will continue the southwesterly flow aloft over the region.  Mixing heights will remain very favorable for good smoke dispersal conditions through the outlook period.  Weather remains dry through Thursday, but some light rain will reach the area by Friday morning with showers continuing Saturday.  By Saturday the snow level will have lowered to around 4500 feet.

2.  DISPERSION

WEDNESDAY
Mixing height 1500 - 2500 ft during the morning.  Mixing height rises above 5000 ft during the afternoon and evening.

Transport wind S to SSW at 10 - 22 mph during the morning.  Transport wind increases to SSW to SW at 20 - 36 mph during the afternoon and evening.

Surface wind S to SW at 6 - 12 mph during the morning.  Surface wind increases to SSW to SW at 12 - 22 mph during the afternoon then decreases to S to SW at 8 - 14 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height above 5000 ft throughout the day.  Transport wind SSW to SW at 30 - 50 mph.  Surface wind SSW to SW at 14 - 28 mph.

FRIDAY
Mixing height 3000 - 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
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.  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 Wednesday, November 4, 2009.
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Delay ignitions until 10:00am.  Avoid ignitions within 10 miles to the S 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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