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: Saturday, May 29, 2010       2:40 PM      Pete Parsons



NOTE:  IN HONOR OF MEMORIAL DAY, THE SMOKE MANAGEMENT WEATHER OFFICE WILL BE CLOSED ON SUNDAY, MAY 30th, AND NO FORECASTS/INSTRUCTIONS WILL BE ISSUED. NORMAL WEATHER OPERATIONS WILL RESUME ON MONDAY, MAY 31ST.



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


    SUNDAY

A transitory and weak upper-level ridge is forecast to move over south-central Oregon in the morning and push east of the region in the afternoon.  Westerly flow aloft will bring increasing clouds in the afternoon with a slight chance of showers north late.  Maximum temperatures will be near normal with fair to good smoke dispersal conditions.

    OUTLOOK (MONDAY-WEDNESDAY)


A weak weather system will come inland Monday, mainly north of the region, but it will produce mostly cloudy and cooler conditions with a slight chance of showers.  A very weak upper-level ridge should keep the shower threat minimal on Tuesday, although a lot of clouds will continue to stream over the region via a westerly flow aloft.  A Pacific frontal system will bring rain to Washington and the northern half of Oregon on Wednesday.  Skies will turn mostly cloudy with a slight chance of rain, mainly north.  Temperatures will stay near normal.  Smoke dispersal conditions should be fair to good during the period with onshore transport winds.



2.  DISPERSION



SUNDAY

Mixing height below 1500 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind SSW to WSW at 4 - 8 mph during the morning.  Transport wind shifts to WSW to WNW at 6 - 10 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WSW to NW at 6 - 10 mph during the afternoon and evening.



OUTLOOK:



MONDAY

Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 12 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.  Surface wind SSW to WSW at 5 - 9 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to WNW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 20 mph.  Surface wind S to SW 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 Sunday, May 30, 2010.

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Avoid ignitions within 12 miles to the SSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through WNW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  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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