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, November 19, 2009       2:40 PM      Nick Yonker

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

Warm front has pushed off to the northeast with the region in the warm sector of the frontal system.  Cold front will swing into the region Friday morning to afternoon.  Expect moisture to increase during the morning.  Colder air will move in with the front, and the following trough.  Snow level will lower to the valley floors during the day.  Air mass will remain mostly unstable and with decent wind flow, will make for excellent smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

Trough exits to the east by Saturday morning with a minor and transitory ridge moving in.  Next front and trough will race in from the Pacific Saturday with the chance of moisture increasing again during the late afternoon to evening.  Temperatures will moderate some with the snow level rising to 5000 ft by Sunday morning.  A ridge will rebuild again late Sunday and Monday, but a warm front will ride through the ridge increasing clouds and the chance of moisture.  Overall, expect a very progressive weather pattern, keeping the air mass mostly unstable and dispersion good to excellent.

2.  DISPERSION

FRIDAY
Mixing height below 3000 ft early rising to 3800 - 4800 ft by late morning.  Afternoon mixing height rises above 5000 ft and remains above 5000 ft through the evening.

Transport wind SSW to SW at 25 - 45 mph during the morning.  Transport wind decreases to SW to W at 16 - 30 mph during the afternoon and decreases to W to WNW at 12 - 22 mph during the evening.

Surface wind SSW to SW at 15 - 25 mph during the morning.  Surface wind decreases to SW to W at 10 - 18 mph during the afternoon and decreases to WSW to WNW at 8 - 12 mph during the evening.

OUTLOOK:

SATURDAY
Mixing height above 5000 ft throughout the day.  Transport wind SW to W at 10 - 22 mph during the morning becoming SSW to SW at 19 - 33 mph during the afternoon.  Surface wind SW to W at 8 - 12 mph during the morning becoming SSW to SW at 10 - 22 mph during the afternoon.

SUNDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to WNW at 15 - 25 mph during the morning becoming W to NW at 10 - 20 mph during the afternoon.  Surface wind WSW to WNW at 10 - 16 mph.

MONDAY
Mixing height 1800 - 2800 ft during the morning and through the afternoon.  Transport wind SSW to SW at 22 - 38 mph during the morning becoming SSW to SW at 25 - 45 mph during the afternoon.  Surface wind SSW to SW at 12 - 24 mph.

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, November 20, 2009.
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Avoid ignitions within 10 miles to the SSW through WNW of 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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