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, April 26, 2011       2:40 PM      Jim Little



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



    WEDNESDAY



A weak upper level ridge drifts east out of the state during the day as an upper level low moves toward Vancouver Island.  Dry weather will prevail.  Mixing heights will at 5000 feet or better and southwesterly transport winds should provide for good smoke dispersal conditions.



    OUTLOOK (THURSDAY - SATURDAY)



The upper level low moves eastward across southern British Columbia with a trailing trough moving across Oregon on Thursday.  Light rain develops during the day.  Transport winds shift to northwesterly and cool air aloft with the trough will keep mixing heights high for good smoke dispersal conditions.



The upper trough slips east and a ridge of high pressure develops in the eastern Pacific and the Gulf of Alaska on Friday.  This will shift winds aloft to north northwesterly over the region.  Expect continued northwesterly transport winds and good smoke dispersal conditions.



By Saturday a surface high noses into western Oregon and a surface thermal trough builds in northern California.  Expect dry weather for Saturday with maximum mixing heights climbing to around 4500 feet and west to northwesterly transport winds.



2.  DISPERSION



WEDNESDAY

Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3100 - 4100 ft during the evening.



Transport wind SSW to SW at 10 - 22 mph during the morning.  Transport wind increases to SW to WSW at 14 - 28 mph during the afternoon and evening.



Surface wind SSW to WSW at 10 - 18 mph during the morning and afternoon.  Surface wind decreases to SW to W at 9 - 15 mph during the evening.



OUTLOOK:



THURSDAY

Mixing height 4000 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 16 - 30 mph during the morning becoming W to NW at 13 - 25 mph during the afternoon.  Surface wind SW to W at 10 - 20 mph during the morning becoming W to NW at 10 - 20 mph during the afternoon.



FRIDAY

Mixing height 2600 - 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 mph.  Surface wind light and variable.



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 WNW to NNW at 4 - 8 mph.  Surface wind WNW to NNW 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 Wednesday, April 27, 2011.

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Avoid ignitions within 10 miles to the SSW through W 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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