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 5, 2010       2:40 PM      Jim Little



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


    WEDNESDAY
A nearly stationary upper level low remains over southern California while the main Pacific jet stream is to the north, cutting into central British Columbia on Wednesday.  Weather will be dry with temperatures running 4-6 degrees above average for the first week in October.  High pressure means light transport winds with a tendency to SW through NW.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
On Thursday the upper low over California kicks out to the northeast and weakens.  The center of the low will be over about Salmon, Idaho by evening.  Expect widespread showers as the low moves out.  Temperatures fall to around 5-10 degrees below average and the lack of surface heating holds mixing heights down.  Upper level flow goes westerly by Friday with a weak weather system moving into Washington early in the day. Moisture will stay well to the northeast so expect dry weather and improving ventilation conditions with warmer daytime temperatures again.  Saturday will see dry weather and generally southerly to south-southwesterly transport winds.

2.  DISPERSION



WEDNESDAY

Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.



Transport wind E to SE at 9 - 15 mph during the morning.  Transport wind shifts to SW to WSW at 8 - 14 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



Surface wind E to SE at 6 - 10 mph during the morning.  Surface wind shifts to SW to WSW at 8 - 12 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 2800 - 3800 ft by late morning and through the afternoon.  Transport wind SW to W at 12 - 24 mph.  Surface wind SW to W at 6 - 12 mph.



FRIDAY

Mixing height below 1000 ft early rising to 2500 - 3500 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 1500 - 2500 ft by late morning rising to 3500 - 4500 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 6, 2010.

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Avoid ignitions within 12 miles in all directions of SSRAs.  No additional restrictions necessary.  Complete ignitions by 3:30pm.



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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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