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

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Tue Nov 30 14:50:18 PST 2010


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Tuesday, November 30, 2010       2:40 PM      Jim Little



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


    WEDNESDAY
The cold front that brought rain and snow to much of the region Tuesday and Tuesday night is south and east of the area for Wednesday.  What remains of the weakening system are now in Idaho, northern Nevada, and northern California.  Scattered showers remain, but the air mass will rapidly stabilize and smoke dispersal conditions will be in the marginal range.  Transport winds will be light and generally west or southwesterly.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
An upper short wave re-energizes the front to the south on Thursday pushing precipitation back into the region.  Southern sections will see greater amounts, but northern areas will see renewed precipitation as well.  A drier pattern sets up for the Friday and the weekend and maximum mixing heights will be held down for likely marginal to perhaps poor smoke dispersal conditions later in the extended period.



2.  DISPERSION



WEDNESDAY

Mixing height 3000 - 4000 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 2300 - 3300 ft during the evening.



Transport wind SSW to SW at 19 - 33 mph during the morning.  Transport wind increases to SSW to SW at 22 - 38 mph during the afternoon and evening.



Surface wind SSW to SW at 10 - 18 mph.



OUTLOOK:



THURSDAY

Mixing height 2500 - 3500 ft during the morning lowering to 1300 - 2300 ft during the afternoon.  Transport wind SSW to SW at 15 - 29 mph.  Surface wind S to SW at 6 - 12 mph.



FRIDAY

Mixing height below 1000 ft during the morning rising to 3000 - 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft during the morning rising to 2000 - 3000 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, December 1, 2010.

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



Avoid ignitions within 12 miles to the SSW through SW of SSRAs.  No additional restrictions necessary.



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

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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