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: Thursday, October 29, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will remain over the region tonight and Friday before flattening and giving way to a cold front late Friday and early Saturday.  Currently the warm front is arcing over the ridge and spreading mainly clouds over the region today.  This will diminish tomorrow as the warm frontal zone moves off to the east.  Air mass mixes out with the warm air aloft mixing down to the surface and improving mixing conditions.  Light to moderate winds will keep smoke dispersion mostly fair.

    OUTLOOK (SATURDAY - MONDAY):

Cold front moves into the region on Saturday, gradually breaking apart as it moves through.  Moisture amounts will be quite light.  Upper ridge will then rebuild Sunday, stabilizing the air mass later in the day.  Ridge remains overhead but moves somewhat eastward on Monday.  Smoke dispersion will gradually worsen through the period.

2.  DISPERSION

FRIDAY
Mixing height 2200 - 3200 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 2500 - 3500 ft during the evening.

Transport wind SSW to W at 6 - 12 mph during the morning.  Transport wind increases to SW to W at 10 - 16 mph during the afternoon and evening.

Surface wind SSW to WSW at 4 - 8 mph.

OUTLOOK:

SATURDAY
Mixing height 2700 - 3700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 14 - 28 mph.  Surface wind SSW to WSW at 10 - 16 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.

SUNDAY
Mixing height 2500 - 3500 ft during the morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

MONDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 1700 - 2700 ft during the afternoon.  Transport wind SSE to SSW at 5 - 9 mph during the morning becoming SW to WNW at 6 - 10 mph 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 Friday, October 30, 2009.
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Avoid ignitions within 12 miles to the SW through WNW of SSRAs.  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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