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: Tuesday, May 18, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

A deep surface low pressure area will track north-northeastward off the Oregon Coast on Wednesday.  Southerly flow ahead of this system will push freezing levels to above 10,000 feet and keep temperatures quite warm.  Rain from a Pacific cold associated with the northward-tracking low crosses the Cascades and spreads across the region during the evening hours.

    OUTLOOK (THURSDAY-SATURDAY)

An upper level trough swings through early in the day Thursday.  Temperatures will be much cooler.  Any showers will end early.  Mixing heights will be quite high for good smoke dispersal conditions.  Clearing skies overnight will mean low level inversions many areas Friday morning.  But daytime heating should help mixing heights recover to near 4000 feet by afternoon for fair to good smoke dispersal conditions.  A weak upper level trough will bring scattered showers to the region Saturday.

2.  DISPERSION

WEDNESDAY

Transport wind S to SSW at 15 - 25 mph during the morning.  Transport wind increases to SW to WSW at 25 - 43 mph during the afternoon and evening.

Surface wind S to SSW at 12 - 22 mph during the morning.  Surface wind increases to SW to WSW at 18 - 30 mph during the afternoon and evening.


OUTLOOK:

THURSDAY
Mixing height 3400 - 4400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 10 - 16 mph.  Surface wind SW to WNW at 6 - 10 mph.

FRIDAY
Mixing height 2200 - 3200 ft during the morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

SATURDAY
Mixing height 3500 - 4500 ft during the morning rising to 4500 - 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 Wednesday, May 19, 2010.
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Avoid ignitions within 10 miles to the S through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the S through W in or near drainages leading to 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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