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 21, 2010       2:40 PM      Pete Parsons



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


SATURDAY

A cold upper-level trough will remain over Oregon with mostly cloudy skies and scattered showers across south-central Oregon.  Morning snow levels will be as low as 3000 feet, so most areas are vulnerable to minor snow accumulations.  Higher terrain could pick up a couple of inches of snow. Once again, maximum temperatures will be 10-15 degrees below normal. Daytime heating could trigger a few afternoon thunderstorms.  High mixing heights will make for good daytime smoke dispersal conditions.

    OUTLOOK (SUNDAY-TUESDAY)

The upper-level trough will slowly push east of the region Sunday and Monday with a progressively drier, more stable, and warmer northwesterly flow aloft tapering off the shower activity.  Skies should become partly cloudy by Monday.  The snow level is forecast to slowly lift to around 6000 feet by Monday with maximum temperatures recovering to within about 5 degrees of normal. Clearing skies will allow morning inversions to form, but cool air aloft will maintain high afternoon mixing heights with good daytime smoke dispersal conditions.  A strong jet stream is forecast to direct another Pacific storm onshore Tuesday with rain likely returning by Tuesday afternoon.


2.  DISPERSION



SATURDAY

Mixing height below 2500 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind WSW to WNW at 10 - 18 mph.



Surface wind WSW to WNW at 10 - 18 mph.



OUTLOOK:



SUNDAY

Mixing height below 2000 ft in the early morning rising to above 5000 ft late morning and throughout the afternoon.  Transport wind NNW to NNE at 9 - 15 mph.  Surface wind N to NE at 8 - 12 mph.



MONDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 6 - 10 mph.  Surface wind SW to W at 4 - 8 mph.



TUESDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 15 - 25 mph during the morning becoming S to SSW at 18 - 32 mph during the afternoon.  Surface wind SE to SSW at 10 - 18 mph during the morning becoming S to SW at 12 - 24 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 22, 2010.

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Avoid ignitions within 10 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the WSW through NE in or near drainages leading to SSRAs.  No additional restrictions necessary.



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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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