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: Friday, December 11, 2009       2:40 PM      Nick Yonker

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

Upper level low off the northern California coast is lifting a warm front into the region this afternoon.  Moisture has started over the southern part of the state and will slowly move northward this evening and into early tomorrow.  Low level cold air will slowly retreat.  Expect mostly snow turning to a snow/rain mix below 5000 ft Saturday afternoon.  Air mass will gradually destabilize through the day and wind flow increase for improving smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY):

The upper trough to the south will gradually combine with the cold trough to the north bringing more showers on Sunday.  Snow level will lower to the valleys floors.  Minor ridge builds in briefly Monday but this will quickly be overrun by the next frontal system coming in from the west.  Look for increasing rain or snow Monday afternoon with the snow level lifting to 4000 - 5000 ft.  Moist and blustery conditions continue into Tuesday under strong SW flow aloft.  Expect generally good mixing and smoke dispersion through the period.

2.  DISPERSION

SATURDAY
Mixing height below 3000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height 3300 - 4300 ft rising to 4000 - 5000 ft during the evening.

Transport wind SSW to SW at 15 - 30 mph.

Surface wind S to SW at 10 - 18 mph during the morning and afternoon.  Surface wind decreases to S to SW at 8 - 14 mph during the evening.

OUTLOOK:

SUNDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 14 - 28 mph.  Surface wind SW to W at 10 - 16 mph.

MONDAY
Mixing height 3000 - 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 8 - 15 mph.  Surface wind light and variable during the morning becoming SE to SSW at 6 - 12 mph during the afternoon.

TUESDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 15 - 25 mph.  Surface wind SSE to SSW at 9 - 15 mph.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Saturday and Sunday, December 12 and 13, 2009.
==================================================================

For Saturday:

Avoid ignitions within 12 miles to the SSW through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SSW through W in or near drainages leading to SSRAs.  No additional restrictions necessary.

For Sunday:

Avoid ignitions within 10 miles to the SW through W 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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