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: Wednesday, October 20, 2010       2:40 PM      Pete Parsons



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



THURSDAY



The strong upper-level ridge that has been over the region for the past few days will shift eastward to over the northern Rockies.  The first in a series of weather systems is forecast to bring increasing clouds to the region late in the day. Increasing south to southwesterly transport winds and higher mixing heights will combine for fair to good afternoon smoke dispersal conditions.


OUTLOOK (FRIDAY-SUNDAY)


A dissipating cold front will bring clouds and a chance of very light rain to the region Friday.  West-southwesterly flow aloft will promote further cooling with continued fair to good afternoon smoke dispersal conditions.  A little stronger system is forecast to bring a better chance of light rain to the region on Saturday.  Daytime smoke dispersion will remain fair to good.  A much stronger and moisture-laden cold front is forecast to spread rain across the entire region Sunday, along with brisk southwesterly to westerly transport winds.



2.  DISPERSION



THURSDAY

Mixing height below 500 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind SSW to SW at 8 - 12 mph during the morning.  Transport wind increases to SSW to WSW at 10 - 18 mph during the afternoon and evening.



Surface wind SSE to SW at 4 - 8 mph.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising to 4400 - 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 12 mph.  Surface wind light and variable during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SW to WSW at 8 - 12 mph.  Surface wind S to SW at 4 - 8 mph during the morning becoming light and variable during the afternoon.



SUNDAY

Mixing height 2800 - 3800 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SW to WSW at 25 - 45 mph during the morning becoming WSW to W at 22 - 38 mph during the afternoon.  Surface wind SSW to SW at 15 - 25 mph during the morning becoming SW to W at 10 - 20 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 Thursday, October 21, 2010.

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Avoid ignitions within 12 miles to the S through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the S through WSW 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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