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, October 19, 2010       2:40 PM      Jim Little



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


    WEDNESDAY
Expect little change in weather for the region on Tuesday.  An upper low continues in the vicinity of southern California and a ridge of high pressure over the Pacific Northwest is shunting weather systems well to the north.  The upper ridge will edge east during the day Wednesday. Maximum afternoon mixing heights will climb to around 3500 feet most areas with a generally southerly transport wind.  Expect fair smoke dispersal conditions much of the region.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
The upper ridge will have moved east by Thursday and an upper short wave will be approaching from the southwest.  This will increase cloudiness throughout the day.  Transport winds most areas will be from the southwest.  By Friday the region will be under southwesterly flow aloft.  There will be very limited moisture for some areas of light rain, but most areas should remain dry during the day. Afternoon mixing heights should climb to 5000 feet. On Saturday an active warm front/cold front combination will approach from the west.  Rain will be on the increase during the afternoon with rain continuing Saturday night and Sunday.





2.  DISPERSION



WEDNESDAY

Mixing height 1000 - 1900 ft during the morning.  Afternoon mixing height rises to 2900 - 3900 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 S to SW at 5 - 9 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 2400 - 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 12 mph.  Surface wind SSW to WSW at 4 - 8 mph.



FRIDAY

Mixing height below 1000 ft early rising to 1400 - 2400 ft by late morning rising to 4300 - 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 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 Wednesday, October 20, 2010.

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



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the SSE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSE through WSW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:30pm.



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

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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