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: Friday, June 11, 2010       2:40 PM      Pete Parsons



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



    SATURDAY


An upper-level ridge will extend from southwestern Oregon to northeastern Washington on Saturday.  Winds aloft and at transport level will remain north-northeasterly with continued drying and warming of the air mass.  After a chilly start, with surface-based morning inversions, plenty of sunshine will help afternoon temperatures recover to near normal.  High afternoon mixing heights should make for good daytime smoke dispersal conditions.  Clearing skies will allow temperatures and mixing heights to quickly drop off in the evening, so residual smoke may stay near the ground.

    OUTLOOK (SUNDAY-TUESDAY)

The upper-level ridge axis is forecast to shift over the region by Sunday afternoon.  Temperatures will warm to slightly above normal with transport winds becoming light northerly.  A cold front is forecast to sweep across the state Monday with increasing southwesterly flow aloft.  This system is fairly dry, but conditions may be unstable enough for it to produce a line of scattered showers or thunderstorms in the afternoon and evening.  At the very least, it will bring some clouds and a return to onshore flow, which will cool temperatures a few degrees both Monday and Tuesday. Daytime heating should continue to yield high afternoon mixing heights.


2.  DISPERSION



SATURDAY

Mixing height below 1500 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind NNE to NE at 12 - 22 mph.



Surface wind NNE to NE at 10 - 16 mph.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind N to NE at 5 - 9 mph.  Surface wind light and variable during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 10 - 20 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 10 - 20 mph during the afternoon.



TUESDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 10 mph.  Surface wind NNW to NNE 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 Saturday, June 12, 2010.

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Avoid ignitions within 10 miles to the NNE through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the NNE through NE 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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