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, October 3, 2010       2:40 PM      Jim Little



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


    MONDAY
A full latitude upper level trough moves into the Pacific Northwest on Monday.  The atmosphere aloft cools considerably for higher maximum mixing heights.  By evening the axis of the trough will be over the Cascade crest and moving east.  Moisture rotation northward from California ahead of the trough should produce areas of light rain.  Transport winds should generally be from the northwest through north.
    EXTENDED OUTLOOK (TUESDAY - THURSDAY)
On Tuesday the southern portion of the upper trough cuts off as an upper level low over southern California leaving the Pacific Northwest under an upper level ridge oriented SW-NE.  Warmer air aloft will suppress maximum mixing heights a bit.  Winds will be generally northerly to north-northeasterly.  On Wednesday the upper level low over California is nearly stationary and cut off from the main westerly flow aloft which is north of the Pacific Northwest.  Surface temperatures should warm enough to push maximum mixing heights to around 5000 feet, however.  The upper low over California weakens on Thursday and moves off to the northeast.  Ventilation conditions remain good.


2.  DISPERSION



MONDAY

Mixing height 1900 - 2900 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1900 - 2900 ft during the evening.



Transport wind NNW to NNE at 8 - 14 mph during the morning.  Transport wind increases to NNW to NNE at 10 - 22 mph during the afternoon and increases to N to NE at 20 - 34 mph during the evening.



Surface wind NNW to NNE at 8 - 12 mph throughout the morning and afternoon.  Surface wind shifts to N to NE at 10 - 20 mph during the evening.



OUTLOOK:



TUESDAY

Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning rising to 3700 - 4700 ft during the afternoon.  Transport wind NNE to NE at 14 - 28 mph.  Surface wind N to NE at 8 - 14 mph during the morning becoming NE to ENE at 13 - 25 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early rising to 1100 - 2100 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



THURSDAY

Mixing height below 1000 ft early rising to 1100 - 2100 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to W 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 Monday, October 4, 2010.

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Avoid ignitions within 12 miles to the NNW through NE 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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