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, May 19, 2011       2:40 PM      Pete Parsons



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


FRIDAY

The strong upper-level trough that brought unseasonably cool and damp conditions earlier this week dropped well southeast of Oregon on Thursday and will rotate northeastward, across the Northern Rockies and into the Northern Plains States, on Friday. Meanwhile, a weak ridge of high pressure is forecast to move onshore Friday morning and slowly drift eastward, to near to Idaho border, by evening.

Mostly sunny skies should warm afternoon temperatures back to near normal.  Expect good daytime mixing with light morning transport winds increasing from the northwest in the afternoon.

OUTLOOK (SATURDAY-MONDAY)

On Saturday a weak upper-level trough is forecast to come onshore.  An associated cold front will bring increasing clouds along with a chance of showers.  More clouds and increasing onshore northwesterly winds will drop afternoon temperatures back below normal.  Daytime mixing will be good.

A moderately strong upper-level trough is forecast to bring mostly cloudy skies and a chance of showers Sunday and Monday.  Temperatures will cool to about 5-10 degrees below average.  Daytime mixing should be good with brisk northwesterly transport winds.


2.  DISPERSION



FRIDAY

Mixing height below 500 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2500 - 3500 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 4 - 8 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to W to NW at 4 - 8 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

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 W to NW at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NW at 8 - 12 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 6 - 10 mph during the morning becoming WNW to NNW at 10 - 16 mph during the afternoon.  Surface wind W to NW at 4 - 8 mph during the morning becoming WNW to NNW at 9 - 15 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 8 - 12 mph.  Surface wind NW to N at 6 - 10 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 Friday, May 20, 2011.

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Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



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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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