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: Tuesday, May 10, 2011       2:40 PM      Jim Little



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



    WEDNESDAY



The upper ridge that brought sunshine to much of the state Tuesday moves east on Wednesday.  In the meantime an upper level low off the west coast of North America becomes the major factor in Pacific Northwest Weather.  A Pacific cold front will move into western Oregon, but the only effect will for south central Oregon during the day will be increasing clouds.  Maximum mixing heights will be high and transport winds will be generally south-southwesterly.



    OUTLOOK (THURSDAY - SATURDAY)



The upper low is centered about 300 miles west of Vancouver Island Thursday morning drifting slowly southward.  There should be some areas of light rain with the remains of the front.  Temperatures will be about four to eight degrees cooler than on Wednesday.  With cool air aloft mixing heights should be quite high and transport winds will be brisk southerly or southwesterly most areas for good smoke dispersal conditions.



The upper low moves to about 500 miles west of the mouth of the Columbia River by Friday.  Upper level flow will be southerly over the region and with the low so far away expect dry weather. Mixing heights should stay high and transport winds will be southerly.



By Saturday the low aloft will be about 350 miles west of Brookings but slowly rotating toward northern California.  This will bring an increasing chance of rain to the area.  Maximum mixing heights will be high, and transport winds will be southerly.



2.  DISPERSION



WEDNESDAY

Mixing height above 5000 ft throughout the day.  Mixing height lowers to 4100 - 5000 ft during the evening.



Transport wind SSW to WSW at 10 - 18 mph during the morning.  Transport wind increases to SSW to SW at 15 - 29 mph during the afternoon and evening.



Surface wind SSW to WSW at 9 - 15 mph during the morning.  Surface wind increases to SSW to SW at 12 - 22 mph during the afternoon then decreases to SW to WSW at 10 - 16 mph during the evening.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 2400 - 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 12 - 24 mph.  Surface wind SSW to SW at 8 - 14 mph during the morning becoming SW to WSW at 10 - 22 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 3400 - 4400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming SSE to SSW at 4 - 8 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 4 - 8 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 Wednesday, May 11, 2011.

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Avoid ignitions within 10 miles to the SSW through WSW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  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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