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: Monday, May 3, 2010       2:40 PM      Jim Little

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

    TUESDAY

A very cool air mass for this time of year will remain over the region.  Temperatures will be about 10 degrees below average.  Moisture will be limited and any showers should stay to the north of the region.  Cool air aloft will keep the atmosphere unstable for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

Temperatures begin to recover a bit but below average readings will continue Wednesday.  Dry weather is likely and smoke dispersal conditions will remain good.  Weak upper level ridging on Thursday will ensure continued dry weather.  Cool air aloft and daytime surface heating will push daytime mixing heights to above 5000 feet but this will be offset by quite light transport winds that may limit burning in some areas.  Light winds and clearing skies mean nighttime inversions to trap smoke near the ground during the overnight period.  By Friday temperatures should be back to near normal.  A weak disturbance moving through a generally westerly flow aloft may produce a few mountain showers.  Mixing heights remain high for good smoke dispersal conditions.


2.  DISPERSION

TUESDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 2500 - 3500 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WSW to WNW at 12 - 24 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WSW to WNW at 10 - 18 mph during the afternoon then decreases to WSW to NW at 6 - 12 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height 2900 - 3900 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 10 - 22 mph.  Surface wind NNW to NNE at 10 - 18 mph.

THURSDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
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 Tuesday, May 4, 2010.
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Avoid ignitions within 10 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WSW through NNE in or near drainages leading to 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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