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, November 2, 2009       2:40 PM      Jim Little

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

      ** Stable Pattern - Poor Smoke Dispersal Conditions Continue **

A weak pacific weather system moving through British Columbian and northwest Washington Monday and Monday evening will be well to the east of the area tomorrow.  This will allow the upper level ridge to strengthen for very stable conditions over the region.  Expect fair weather but low mixing heights, mostly south to southeasterly winds, and generally poor smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

Wednesday is a transition day as the upper ridge axis shifts eastward.  Expect some improvement in smoke dispersal conditions.  Winds will be generally light southerly.  By Thursday an upper trough will be approaching as the upper ridge axis moves out of the northern Rockies and into the northern plains. Smoke dispersal conditions will improve considerably by Thursday. Winds aloft will be southerly and surface winds will pick up from the south.  A Pacific cold front will reach the coast late in the day and spread rain eastward into the region by Friday morning.  Friday expect cloudy, showery weather most areas with good smoke dispersal conditions and a generally southerly wind early, shifting to northwesterly later in the day.

2.  DISPERSION

TUESDAY
Mixing height 1000 - 1800 ft during the morning.  Afternoon mixing height rises to 1500 - 2500 ft then lowers below 1000 ft during the evening.

Transport wind SSE to SW at 4 - 8 mph during the morning and afternoon.  Transport wind increases to S to SSW at 9 - 15 mph during the evening.

Surface wind light and variable and controlled by local terrain through the day.  Surface wind increases to SSE to SSW at 4 - 8 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind S to SSW at 10 - 18 mph.  Surface wind S to SW at 6 - 10 mph.

THURSDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SE to SSW at 4 - 8 mph.  Surface wind light and variable.

FRIDAY
Mixing height 3000 - 4000 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 Tuesday, November 3, 2009.
==================================================================

Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the SSE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSE through SW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

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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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