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 9, 2010       2:40 PM      Jim Little

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

    MONDAY

An upper level low moves into SW Oregon/Northern California during the day.  This will produce showers throughout the region with heaviest amounts in southern zones.  The air mass will be cool and snow is possible above 4500 feet ASL.  Mixing heights will be fairly high for fair to good smoke dispersal conditions.


    OUTLOOK (TUESDAY-THURSDAY)

High pressure aloft develops offshore with the upper low tracking across Nevada and Utah on Tuesday.  Showers should decrease rapidly during the day.  By Wednesday a thermal trough is well established in central California for a generally northerly transport wind. Also by Wednesday the upper ridge moves over the area and will dominate area weather for Wednesday and Thursday with dry weather likely. Sunshine and daytime heating will help keep maximum mixing heights high throughout the outlook period but the clear skies will aid radiational cooling for nighttime inversions and very low mixing conditions during the overnight period.

2.  DISPERSION

MONDAY
Mixing height 1800 - 2800 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2000 - 3000 ft during the evening.

Transport wind SW to W at 10 - 20 mph during the morning.  Transport wind decreases to SW to W at 8 - 14 mph during the afternoon then shifts to WNW to NNW at 8 - 12 mph during the evening.

Surface wind SW to WNW at 6 - 10 mph throughout the morning and afternoon.  Surface wind shifts to WNW to NNW at 4 - 8 mph during the evening.

OUTLOOK:

TUESDAY
Mixing height 3100 - 4100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to N at 16 - 26 mph.  Surface wind NW to N at 10 - 16 mph during the morning becoming N to NNE at 10 - 22 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

THURSDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph.  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 10, 2010.
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Avoid ignitions within 12 miles to the SW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SW through NNE in or near drainages leading to SSRAs.  Watch for shifting transport winds.  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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