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: Friday, May 14, 2010       2:40 PM      Pete Parsons



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


   SATURDAY

A transitory upper-level ridge is forecast to move over Oregon for continued mostly dry and warm weather.  Once again, there could be isolated afternoon mountain thundershowers.  After morning inversions, daytime mixing should be good.  Morning southerly transport winds should turn more westerly in the late afternoon and evening.

    OUTLOOK (SUNDAY-TUESDAY)

The flow aloft is forecast to turn southwesterly on Sunday, and southerly on Monday, as a weather system moves into northern California.  The air mass will become increasingly unstable with scattered showers and thunderstorms likely by Monday.  Afternoon mixing should be good with mostly southerly or southwesterly transport winds.  A transitory upper-level ridge will bring drying on Tuesday.  The flow aloft will become northwesterly with transport winds turning westerly to northwesterly.


2.  DISPERSION



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 2000 ft during the evening.



Transport wind S to SW at 6 - 10 mph throughout the morning and afternoon.  Transport wind shifts to W to NW at 5 - 9 mph during the evening.



Surface wind S to SW at 5 - 9 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 8 - 14 mph.  Surface wind SSE to SW at 4 - 8 mph during the morning becoming SSW to SW at 9 - 15 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 10 - 20 mph during the morning becoming S to SW at 15 - 25 mph during the afternoon.  Surface wind SSE to SSW at 9 - 15 mph during the morning becoming SSW to WSW at 9 - 15 mph during the afternoon.



TUESDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph.  Surface wind WSW to WNW at 6 - 10 mph during the morning becoming WNW to NW at 8 - 12 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 Saturday, May 15, 2010.

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Avoid ignitions within 12 miles to the S through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSE through NW in or near drainages leading to SSRAs.  Watch for shifting transport winds.



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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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