SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Tuesday, November 2, 2010       2:40 PM      Jim Little



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


    WEDNESDAY
*** Poor Smoke Dispersal Conditions ***
Upper air charts show a broad ridge with its axis stretching from Arizona northward to Alberta and a broad trough in the Gulf of Alaska and the eastern Pacific about 900 miles west of the coast.  Upper flow over Oregon is southwesterly.  Temperatures aloft will be much warmer than average for this time of year.  The warm air aloft will make the atmosphere very stable for unfavorable smoke dispersal conditions.  Transport winds will be generally from southeast and light, while mixing heights will be quite low.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
*** Marginal Ventilation for Thursday ***
The upper level pattern slowly shifts east with little improvement for Thursday.  By Friday the upper trough approaches from the west and temperatures aloft will be much cooler helping to improve ventilation.  Smoke dispersal conditions become good with a brisk south or south-southwesterly transport wind developing.  The initial weather system will likely not produce rain on Friday, but more moisture moves into the Pacific Northwest for some rain possible Saturday.



2.  DISPERSION



WEDNESDAY

Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1400 - 2400 ft then lowers below 1000 ft during the evening.



Transport wind S to SSW at 8 - 14 mph.



Surface wind SSE to SW at 4 - 8 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon and evening.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft during the morning rising to 2400 - 3400 ft during the afternoon.  Transport wind S to SSW at 8 - 14 mph.  Surface wind S to SW at 4 - 8 mph.



FRIDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 1900 - 2900 ft by late morning rising to 3000 - 4000 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, November 3, 2010.

==================================================================



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the SSE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSE through SW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.



==============================================================

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_south_central/attachments/20101102/d0736b05/attachment.html>