SMI South Central (Smoke Management Instructions) Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

 

ISSUED: Wednesday, April 28, 2010       2:40 PM      Jim Little

 

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

 

 

    THURSDAY

 

A cold upper-level trough will shift eastward, to over the northern Rockies, with a northwesterly flow aloft over Oregon.  Snow levels will start out near 2500 feet in the morning and rise to around 3500 feet in the afternoon.  The air mass will still be somewhat unstable with daytime heating increasing shower activity in the afternoon.  Precipitation will be enhanced on west-facing slopes. Maximum mixing heights will rise above 5000 feet for good to excellent smoke dispersal conditions. Surface temperatures will be well below normal.  

 

    OUTLOOK (FRIDAY-SUNDAY)

 

The strong upper-level trough will continue to shift eastward with the flow aloft over Oregon becoming progressively drier and more northerly.  The air mass will remain unstable enough for daytime heating to maintain a few showers on Friday with good to excellent smoke dispersion.  Skies will begin clearing Saturday and Sunday with only a slight chance of an afternoon shower.  Chilly overnights will make for low early morning mixing heights, but afternoon smoke dispersion should be fair to good on Saturday and fair on Sunday.  The snow level will rise from 4000 feet, on Friday, to 6000 feet by Sunday.

 

2.  DISPERSION

 

THURSDAY

Mixing height 4300 - 5000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3500 - 4500 ft during the evening.

 

Transport wind W to NW at 10 - 20 mph during the morning.  Transport wind increases to NW to NNW at 14 - 28 mph during the afternoon and increases to NW to NNW at 18 - 32 mph during the evening.

 

Surface wind W to NW at 9 - 15 mph during the morning.  Surface wind increases to NW to NNW at 10 - 22 mph during the afternoon and evening.

 

OUTLOOK:

 

FRIDAY

Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to N at 12 - 24 mph.  Surface wind NW to N at 9 - 15 mph during the morning becoming NNW to N at 12 - 22 mph during the afternoon.

 

SATURDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to NNE at 6 - 10 mph during the morning becoming NW to N at 10 - 16 mph during the afternoon.  Surface wind NNW to NNE at 4 - 8 mph.

 

SUNDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind NW to N at 10 - 18 mph.  Surface wind NNW to NNE at 6 - 10 mph.

 

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Thursday, April 29, 2010.

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Avoid ignitions within 10 miles to the W through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the W through N in or near drainages leading to 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