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, November 23, 2010       2:40 PM      Nick Yonker



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



Arctic air drove down from the north early this morning and will set up shop for the next couple of days before gradually moderating.  Air mass is moderately unstable today but as the surface temperatures cool tonight, strong temperature inversions will form and limit mixing overnight.  As the upper ridge off the coast slowly moves in the air mass will slowly warm aloft.  With chilly air near the surface, this will make for mostly poor mixing Wednesday.  Wind flow will also be quite light under little pressure gradients.  Thus smoke dispersion will be quite poor.



    OUTLOOK (THURSDAY - SATURDAY):



A flattening upper level ridge builds in on Thanksgiving bringing warming temperatures aloft and near the surface.  Another front will approach from the Pacific bringing increasing clouds on Friday.  Moisture will not likely begin until later Friday with scattered snow showers through Saturday.  Air mass will remain stable through Friday before destabilizing on Saturday.  Wind flow will increase from the S to SW on Thursday, increase more on Friday, and then decrease and turn more W to NW on Saturday.  Smoke dispersion will be poor Thursday, improving Friday, and good to excellent on Saturday.



2.  DISPERSION



WEDNESDAY

Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1700 - 2700 ft then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 4 - 8 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft during the morning rising to 1900 - 2900 ft during the afternoon.  Transport wind S to SW at 4 - 8 mph during the morning becoming SSW to WSW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming S to SW at 4 - 8 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2000 - 3000 ft during the afternoon.  Transport wind SSW to SW at 12 - 24 mph.  Surface wind SSE to SSW at 9 - 15 mph.



SATURDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SW to W at 10 - 20 mph during the morning becoming W to NW at 10 - 20 mph during the afternoon.  Surface wind SSE to SW at 6 - 12 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.



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 24, 2010.

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Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the W through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3 p.m.



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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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