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: Thursday, June 10, 2010       2:40 PM      Pete Parsons



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



    FRIDAY


The upper-level trough that brought cool and showery weather to the region Wednesday and Thursday will shift eastward and stretch from Montana to Nevada. Clearing skies will bring cold early morning temperatures with areas of frost.  A fairly weak upper-level ridge will build just offshore with the flow aloft drying and turning northerly.  Transport winds will turn north to northeasterly with some sunshine helping afternoon temperatures recover to within 5-10 degrees of 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 settle near the ground.

    OUTLOOK (SATURDAY-MONDAY)

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 across the region.  After a chilly start, with surface-based morning inversions, plenty of sunshine will help afternoon temperatures recover to near normal.  An offshore cold front is forecast to push the upper-level ridge axis just east of the region by Sunday afternoon.  Temperatures will warm to slightly above normal with transport winds becoming light northerly.  The cold front is forecast to sweep across the region Monday afternoon with north-northwesterly transport winds ushering cooler air back into the region along with some clouds and a risk of a mountain shower or thunderstorm. Daytime heating should yield high afternoon mixing heights during the outlook period.


2.  DISPERSION



FRIDAY

Mixing height below 2000 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind N to NE at 6 - 10 mph during the morning.  Transport wind increases to N to NE at 10 - 20 mph during the afternoon and increases to NNE to NE at 13 - 25 mph during the evening.



Surface wind N to NE at 4 - 8 mph during the morning.  Surface wind increases to N to NE at 10 - 16 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNE to NE at 10 - 16 mph.  Surface wind NNE to ENE at 6 - 12 mph.



SUNDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 6 - 10 mph during the morning becoming NW to NNE at 4 - 8 mph during the afternoon.  Surface wind N to NE at 4 - 8 mph during the morning becoming light and variable during the afternoon.



MONDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 4 - 8 mph during the morning becoming NW to N at 12 - 22 mph during the afternoon.  Surface wind NNW to NNE at 4 - 8 mph during the morning becoming NW to N at 10 - 18 mph during the afternoon.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Friday, June 11, 2010.

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