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: Tuesday, June 8, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level low pressure area will move to off the Washington coast Wednesday.  This will give southwesterly flow aloft to the region.  A Pacific weather system embedded in that southwesterly flow will spread rain eastward beginning in the morning.  Amounts should be around 1/10th of an inch.  High mixing heights will give good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low weakens - the remaining trough slowly moves east across the Pacific Northwest.  There will still be enough moisture for some scattered showers.  Mixing heights should be quite high for good smoke dispersal conditions.  By Friday upper ridging develops in the eastern Pacific.  Dry and warmer conditions are on tap for Friday and Saturday.  Warmer afternoon temperatures will push mixing heights above 5000 feet for generally good smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY
Mixing height 4100 - 5000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2300 - 3300 ft during the evening.

Transport wind SW to WSW at 20 - 34 mph during the morning.  Transport wind increases to SW to W at 22 - 40 mph during the afternoon then decreases to W to WNW at 12 - 24 mph during the evening.

Surface wind SW to WSW at 15 - 25 mph during the morning and afternoon.  Surface wind decreases to W to NW at 10 - 18 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height 2400 - 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 8 - 14 mph.  Surface wind W to NW at 6 - 10 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 2600 - 3600 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 Wednesday, June 9, 2010.
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Avoid ignitions within 10 miles to the SW through WNW 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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