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: Thursday, October 7, 2010       2:40 PM      Pete Parsons



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



FRIDAY



A blocking pattern in the upper-level flow will break down, as the trough over Nevada gets ejected eastward to over the northern Rockies.  Clouds and showers associated with the Nevada low will push eastward with some sunbreaks helping to lift afternoon mixing heights.  However, transport winds will remain fairly light.


OUTLOOK (SATURDAY-MONDAY)


Two cold fronts will bring spread clouds back over the region this weekend with rain likely by Sunday...especially north.  Brisk southwesterly transport winds will veer to westerly, in the wake of the second cold front, Sunday evening.  The flow aloft will dry out and turn northwesterly on Monday.  Transport winds will turn north-northeasterly, with subsidence aloft suppressing afternoon mixing heights.



2.  DISPERSION



FRIDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind S to SW at 6 - 10 mph.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind S to SW at 8 - 14 mph during the morning becoming SW to W at 10 - 20 mph during the afternoon.  Surface wind SSE to SSW at 4 - 8 mph.



SUNDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind SSW to SW at 9 - 15 mph.  Surface wind S to SW at 4 - 8 mph.



MONDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind N to NE at 6 - 10 mph.  Surface wind light and variable during the morning becoming NNW to NE at 4 - 8 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 Friday, October 8, 2010.

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Avoid ignitions within 15 miles to the S through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SE through WSW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



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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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