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: Monday, October 4, 2010       2:40 PM      Jim Little



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


    TUESDAY
Monday's trough splits...a portion moves across central Canada and the rest becomes a cut-off low over southern California.  An upper ridge develops offshore and noses into Washington while a surface thermal trough develops in the central valley of California.  This will give a northeasterly flow most areas and dry weather for the region.  Warmer air aloft with the ridge will suppress mixing heights.  Smoke dispersal conditions will generally be fair to good.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
The upper level cut-off low remains over southern California on Wednesday as a thermal trough builds northward overnight Tuesday to off the SW Oregon Coast.  Weather should remain dry.  By Thursday afternoon the upper level low is pulling out over NE Nevada.  This will bring a chance of showers to the area.  Friday some scattered showers are still possible from the remains of the upper level low.  Mixing heights will improve and transport winds will be generally southwesterly.


2.  DISPERSION



TUESDAY

Mixing height 1700 - 2700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3500 - 4500 ft during the evening.



Transport wind N to NE at 10 - 22 mph during the morning.  Transport wind increases to NE to ENE at 19 - 33 mph during the afternoon and evening.



Surface wind N to NE at 8 - 14 mph during the morning.  Surface wind increases to NE to ENE at 13 - 25 mph during the afternoon then decreases to NE to E at 10 - 20 mph during the evening.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 6 - 12 mph during the morning becoming E to ESE at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming ENE to ESE at 5 - 9 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 1900 - 2900 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind SSE to SSW at 6 - 10 mph during the morning becoming light and variable during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 1300 - 2300 ft by late morning rising to 4500 - 5000 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 Tuesday, October 5, 2010.

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Avoid ignitions within 10 miles to the N through E of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the N through E in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.



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

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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