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 11, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level ridge slowly moves eastward across the region. By late afternoon the axis of this ridge extends from eastern British Columbia to southwestern Oregon.  Expect dry northerly upper level flow on the east side of that ridge.  Warm daytime temperatures should push daytime mixing heights quite high for good smoke dispersal conditions.  Clearing skies at night will allow surface based inversions to form and trap any residual smoke near the surface overnight and into early morning hours.

    OUTLOOK (THURSDAY-FRIDAY)

The upper ridge weakens on Thursday with a light, generally westerly, flow aloft throughout the outlook period.  Periodic minor impulses ripple across the region in the westerlies aloft but should do little to affect sensible weather.  Weather will remain dry.  Skies will be generally sunny.  Mixing heights fairly high for generally good smoke dispersal conditions.  Clearing skies at night will allow surface based inversions to form and trap any residual smoke near the surface overnight and into early morning hours.


2.  DISPERSION

WEDNESDAY
Mixing height 1900 - 2900 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1500 - 2500 ft during the evening.

Transport wind N to NE at 6 - 12 mph.

Surface wind N to NE at 6 - 10 mph.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through 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 12, 2010.
    ==================================================================

Avoid ignitions within 15 miles to the N through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the N through ESE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.

    ==============================================================
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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