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: Sunday, May 23, 2010       2:40 PM      Jim Little

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

    THURSDAY

Weak upper level ridging ahead of an upper low west of the Queen Charlotte Islands will be the main weather feature of the day.  Expect dry weather.  Temperatures should remain mild but below average for the time of year.  Nighttime inversions will keep smoke from smoldering fires close to the ground during the overnight period.  Mixing heights will be quite high during the afternoons and a south southeast to south southwest wind should provide for good smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY)

The ridge strengthens early Tuesday then pushes east by mid day.  Weather will stay dry.  Nighttime inversions continue but daytime mixing heights should be above 5000 feet with a south or south-southeast transport wind for good smoke dispersal conditions.  On Wednesday the upper low elongates north to south with a moist southerly flow increasing over the region.  This will keep showers going into Thursday.  On Thursday the upper low drops southward to off the Oregon coast.  Expect fair to good smoke dispersal conditions throughout the outlook period.

2.  DISPERSION

MONDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3400 - 4400 ft during the evening.

Transport wind SW to W at 9 - 15 mph during the morning.  Transport wind increases to WSW to W at 12 - 24 mph during the afternoon and evening.

Surface wind SW to W at 8 - 14 mph.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising to 4100 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 10 - 20 mph.  Surface wind S to SW at 6 - 12 mph during the morning becoming SSW to WSW at 8 - 12 mph during the afternoon.

WEDNESDAY
Mixing height 2400 - 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 8 - 12 mph during the morning becoming SSE to SSW at 12 - 24 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph.

THURSDAY
Mixing height 1800 - 2800 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 24, 2010.
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Avoid ignitions within 10 miles to the SW through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the S through W in or near drainages leading to SSRAs.

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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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