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: Sunday, November 21, 2010       2:40 PM      Jim Little



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


    MONDAY
A cold weather pattern has set up for the Pacific Northwest.  In the upper atmosphere a strong ridge of high pressure has developed up in the eastern Pacific and the Gulf of Alaska with a cold trough extending from north-central Canada into southern California.  This leaves the Pacific Northwest in a cold northerly flow aloft.  There will be enough moisture for snow although amounts should be light, generally less than an inch although some locations could get as much as 2 inches.
Smoke dispersal conditions will be generally good with most areas seeing a southwesterly transport wind.
    EXTENDED OUTLOOK (TUESDAY - THURSDAY)
The upper disturbance that moves through Monday afternoon and evening will bring another round of snow to the area.  The snow will be tapering off on Tuesday as a drier flow moves over the region.  Smoke dispersal conditions will be fair to good.
For Wednesday and Thursday, the cold upper trough will move east and the ridge in the Pacific will begin to move over the area.  Upper flow will be northerly and dry for mostly sunny weather. Temperatures, however, will remain cool.  Cold nighttime temperatures will promote overnight inversions that will be slow to break and limit maximum mixing heights.  Thus smoke dispersal conditions will be marginal Wednesday and beyond.

2.  DISPERSION



MONDAY

Mixing height 3500 - 4500 ft throughout the day.



Transport wind WSW to W at 26 - 46 mph during the morning.  Transport wind increases to SW to W at 32 - 52 mph during the afternoon and increases to SW to W at 37 - 57 mph during the evening.



Surface wind WSW to W at 16 - 30 mph during the morning and afternoon.  Surface wind increases to SW to WSW at 21 - 37 mph during the evening.



OUTLOOK:



TUESDAY

Mixing height above 5000 ft throughout the day.  Transport wind WNW to NW at 18 - 32 mph during the morning becoming NW to NNW at 10 - 20 mph during the afternoon.  Surface wind W to NW at 10 - 22 mph.



WEDNESDAY

Mixing height below 1000 ft during the morning rising to 2000 - 3000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



THURSDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2000 - 3000 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 4 - 8 mph during the afternoon.  Surface wind SSE to SSW at 4 - 8 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 Monday, November 22, 2010.

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Avoid ignitions within 10 miles to the SW through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SW through WNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.



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

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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