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: Thursday, November 5, 2009       2:40 PM      Nick Yonker

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

Cold front and upper level trough are approaching the region this afternoon and will bring increasing clouds to the area later this afternoon and evening.  Moisture will spread in from the west to the east tonight.  Cold front will move through early tomorrow morning with rain turning to showers as the upper level trough follows.  Snow level will lower to near 6000 ft.  Front will bring improved mixing and dispersion under brisk SW'erly flow.

    OUTLOOK (SATURDAY - MONDAY):

Upper level trough will remain over the region until Sunday keeping the air mass cool, moist, and unstable.  Brief upper ridge follows Sunday with the air mass stabilizing Sunday night.  Ridge then gets shoved eastward by the next front and trough on Monday.  Expect an increasing chance of moisture later Monday.  With the exception of the brief ridge, the air mass should remain mostly unstable, and smoke dispersion good through the period.

2.  DISPERSION

FRIDAY
Mixing height below 3000 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft and remains above 5000 ft through the evening.

Transport wind WSW to W at 22 - 38 mph during the morning.  Transport wind decreases to WSW to W at 18 - 32 mph during the afternoon and decreases to SW to W at 15 - 25 mph during the evening.

Surface wind WSW to W at 15 - 25 mph during the morning.  Surface wind decreases to WSW to W at 10 - 22 mph during the afternoon and decreases to SW to W at 9 - 15 mph during the evening.

OUTLOOK:

SATURDAY
Mixing height 3800 - 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 14 - 28 mph during the morning becoming SW to WSW at 20 - 35 mph during the afternoon.  Surface wind SW to WSW at 10 - 18 mph.

SUNDAY
Mixing height 4500 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 10 mph.  Surface wind SSW to WSW at 4 - 8 mph.

MONDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SE to SSW at 9 - 15 mph during the morning becoming SSE to SSW at 15 - 25 mph during the afternoon.  Surface wind SE to S at 6 - 10 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 Friday, November 6, 2009.
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Avoid ignitions within 10 miles to the WSW through W of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

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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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