SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Fri Apr 3 14:34:09 PDT 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, April 3, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will build into the region tomorrow bringing a mostly sunny day.  Temperatures will remain chilly with a hard freeze Saturday morning.  Air mass will stabilize and wind flow turns lightly offshore.  Expect poor to fair smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY):

Upper ridge drifts to the east Sunday and Monday with an upper low undercutting it as it moves into California.  Overall, expect a dry and mild period with mostly sunny skies.  Air mass will be stable during the night and morning hours with a brief period of instability during the afternoon over inland locations.  Offshore flow will continue through Monday before breaking down and turning light and variable Tuesday afternoon.  Smoke dispersion will remain mostly poor to fair.

2.  DISPERSION

SATURDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind E to SE at 8 - 12 mph during the morning.  Transport wind increases to ESE to SSE at 10 - 18 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to ESE to SSE at 5 - 9 mph during the afternoon and evening.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ESE to SSE at 10 - 20 mph.  Surface wind E to ESE at 4 - 8 mph during the morning becoming SE to S at 6 - 12 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind E to SE at 8 - 12 mph.  Surface wind E to SE at 5 - 9 mph during the morning becoming light and variable during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind SE to SSW at 6 - 10 mph during the morning becoming light and variable during the afternoon.  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 Saturday and Sunday, April 4 and 5, 2009.
==================================================================

For Saturday:

Avoid ignitions within 15 miles to the E through SSE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the E through SSE in or near drainages leading to SSRAs.

For Sunday:

Avoid ignitions within 15 miles to the E through S of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the E through S in or near drainages leading to SSRAs.

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