SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

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

ISSUED: Wednesday, December 1, 2010       2:40 PM      Jim Little

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

    THURSDAY

A weak upper disturbance moves across the region.  Skies will be cloudy with light rain or snow.  The snow level will be about 4000 feet.    Transport winds will be generally southwesterly. The atmosphere will be fairly stable and smoke dispersal conditions will only marginal.


    EXTENDED OUTLOOK (FRIDAY - SUNDAY)

An upper low in the Gulf of Alaska drops southeast to a position about 500 miles off the Oregon coast Thursday.  This will induce a ridge over the Pacific Northwest. The atmosphere will again be very stable.  Expect poor ventilation conditions.  On Friday the upper low moves to about 600 miles west of San Francisco, California.  The ridge axis shifts east and this will allow the low to spread some moisture northward from California and Nevada.  Precipitation amounts should be very light, but the atmosphere will remain stable and ventilation conditions remain poor.  The remains of the upper low move closer to the California coast on Saturday.  Upper flow over the Pacific Northwest goes to nearly due southerly.  With warm air aloft and plenty of cloud cover and low sun angle for minimal surface heating, maximum mixing heights remain low and most of the region will experience poor ventilation conditions

2.  DISPERSION

THURSDAY
Mixing height 2200 - 3200 ft throughout the day.

Transport wind SW to WSW at 14 - 28 mph during the morning.  Transport wind decreases to WSW to WNW at 10 - 20 mph during the afternoon and evening.

Surface wind SSW to WSW at 8 - 12 mph during the morning.  Surface wind shifts to WSW to WNW at 5 - 9 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height 1000 - 1900 ft during the morning and through the afternoon.  Transport wind S to SW at 4 - 8 mph during the morning becoming E to SE at 8 - 12 mph during the afternoon.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft during the morning rising to 1000 - 2000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft during the morning rising to 1000 - 2000 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 Thursday, December 2, 2010.
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Avoid ignitions within 12 miles to the SW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SW through NW in or near drainages leading to SSRAs.

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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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