SMI Northeast (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       2:35 PM      Jim Little



1.    DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638



    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 spreads east from the remains of the front mentioned above.  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



Zone 630 and 632:

Mixing height above 5000 ft throughout the day.  Mixing height lowers to 1300 - 2300 ft during the evening.



Transport wind SSW to SW at 10 - 16 mph during the morning.  Transport wind shifts to WNW to NNW at 8 - 14 mph during the afternoon then increases to WNW to NNW at 10 - 20 mph during the evening.



Surface wind SSW to SW at 8 - 14 mph during the morning.  Surface wind shifts to WNW to NNW at 6 - 12 mph during the afternoon and evening.

Zone 633 - 638:

Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.



Transport wind S to SW at 8 - 14 mph during the morning.  Transport wind shifts to WSW to WNW at 6 - 12 mph during the afternoon and shifts to WNW to NNW at 6 - 10 mph during the evening.



Surface wind S to SW at 8 - 12 mph during the morning.  Surface wind shifts to WSW to NW and decreases to 4 - 8 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



THURSDAY

Mixing height 1700 to 2700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 6 - 10 mph.  Surface wind WNW to NNW at 4 - 8 mph.



FRIDAY

Mixing height 3400 to 4400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 4 - 8 mph.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind W to NW at 4 - 8 mph.  Surface wind W to NW at 4 - 8 mph.



3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Wednesday, April 27, 2011.

    ==================================================================



Zone 630 and 632:

Avoid ignitions within 12 miles to the S through NNW of SSRAs.  Watch for shifting transport winds.  No additional restrictions necessary.  Complete ignitions by 4:00pm.



Zone 633 - 638:

Avoid ignitions within 12 miles to the S through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the S through NNW in or near drainages leading to SSRAs.  Watch for shifting transport winds.  Complete ignitions by 4:00pm.



    =========================================================

4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)-

    945-7401. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  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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