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: Sunday, May 3, 2009       2:40 PM      Jim Little

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


Upper air charts show a deep, slow moving low in the southern Gulf of Alaska.  A strong west-to-east jet to the south of that low will push moisture into the Pacific Northwest through midweek.  Rain spreads back in late Monday morning and increases during the afternoon.  Mixing heights will be high for good smoke dispersal conditions and transport winds will be southerly.

    OUTLOOK (TUESDAY - THURSDAY):

Look for scattered showers then rain increasing later Tuesday with another front moving in Tuesday night.  Post-frontal showers will continue Wednesday but the weather should be dry by Thursday.  Winds will be southwesterly Tuesday and Wednesday then shift to northwesterly on Thursday.  Expect good mixing heights and good smoke dispersal conditions through the outlook period.

2.  DISPERSION

MONDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 4000 - 5000 ft during the evening.

Transport wind S to SSW at 15 - 29 mph during the morning.  Transport wind increases to S to SW at 22 - 40 mph during the afternoon and increases to SSW to SW at 28 - 48 mph during the evening.

Surface wind SE to S at 12 - 22 mph during the morning.  Surface wind increases to S to SSW at 14 - 28 mph during the afternoon then decreases to SSE to SSW at 12 - 22 mph during the evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SW to WSW at 15 - 29 mph.  Surface wind SSE to SSW at 8 - 14 mph during the morning becoming SSW to SW at 10 - 22 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SW to WSW at 10 - 16 mph during the morning becoming WSW to WNW at 14 - 28 mph during the afternoon.  Surface wind SSW to WSW at 10 - 16 mph during the morning becoming WSW to WNW at 15 - 25 mph during the afternoon.

THURSDAY
Mixing height 3500 - 4500 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 Monday, May 4, 2009.
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Avoid ignitions within 10 miles to the S through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the S through WSW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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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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