SMI South Central (Smoke Management Instructions) South Central Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, April 26, 2010       2:40 PM      Jim Little

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

    TUESDAY

A deep trough extends from the Gulf of Alaska southeastward to Oregon.  The cold front that moved into western Oregon Monday sweeps across eastern Oregon bringing rain to the region.  The air mass will be quite unstable and maximum mixing heights will go above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

Showery weather continues Wednesday across the region. The upper trough weakens but periodic impulses move NNW to SSE across the state to keep showers going into Friday.  Maximum mixing heights should reach 5000 feet plus throughout the outlook period for good smoke dispersal conditions.


2.  DISPERSION

TUESDAY
Mixing height 2900 - 3900 ft during the morning.  Mixing height rises above 5000 ft during the afternoon and evening.

Transport wind SSW to SW at 25 - 43 mph during the morning.  Transport wind shifts to W to WNW and decreases to 14 - 28 mph during the afternoon and evening.

Surface wind SSW to SW at 16 - 30 mph during the morning.  Surface wind shifts to WSW to WNW and decreases to 9 - 15 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height 3700 - 4700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to W at 14 - 28 mph.  Surface wind SW to W at 10 - 18 mph.

THURSDAY
Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 3200 - 4200 ft during the morning rising above 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 Tuesday, April 27, 2010.
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Avoid ignitions within 10 miles to the SSW through WNW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.  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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