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, May 8, 2011       2:40 PM      Jim Little



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



  MONDAY



A very deep (for this time of year) upper low is centered over the Oregon/Idaho/Nevada border early in the day.  It pulls slowly south during the day and by evening is centered over Wendover, Utah.  As the low moves away weak upper ridging builds offshore.  Scattered light showers are possible through much of the day.  Maximum mixing heights should be near 5000 feet for good smoke dispersal conditions.



  EXTENDED OUTLOOK (TUESDAY - THURSDAY)



Tuesday the ridge builds and moves over the region for dry weather.  Surface temperatures should warm to two to four degrees above average and the warmer daytime conditions should help to keep afternoon mixing heights high for good smoke dispersal conditions.



On Wednesday the ridge moves east as yet another deep upper level low moves slowly southeastward in the Gulf of Alaska and begins to affect the Pacific Northwest.  This low will be a major weather feature for several days.  Wednesday, however, will only see an increase in cloudiness through the day. Temperatures will be from 5 to 8 degrees above average.  Models indicate a fair amount of shear in the transport winds.  Winds will be generally northwesterly at low levels backing to southwesterly with height.  This could limit plume growth and inhibit smoke dispersal conditions.



Friday sees a broad upper low centered about 200 miles west of Vancouver Island with southwesterly flow aloft over the region. Expect a few scattered showers and temperatures two to five degrees below average.  Mixing heights will climb to 5000 feet or better for good smoke dispersal conditions.



2.  DISPERSION



MONDAY



Transport wind NNW to NNE at 10 - 22 mph.



Surface wind NNW to NNE at 10 - 16 mph.





OUTLOOK:



TUESDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 8 - 14 mph.  Surface wind NNW to NNE at 5 - 9 mph.



WEDNESDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 4 - 8 mph during the morning becoming SW to WNW at 4 - 8 mph during the afternoon.  Surface wind S to SW at 4 - 8 mph during the morning becoming SW to WNW at 4 - 8 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 3400 - 4400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind SW to W 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 Monday, May 9, 2011.

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