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, June 3, 2010       2:40 PM      Pete Parsons



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



    FRIDAY


An unseasonably strong westerly jet stream will direct another potent Pacific storm across Oregon.  Widespread morning rain will give way to showery conditions in the afternoon.  A surface low-pressure system is forecast to track across extreme northwestern Oregon and western Washington in the early morning and then rapidly move into northeastern Washington in the afternoon.  It is not forecast to be a real strong low-pressure system, but the forecast track is favorable to bring breezy southwesterly winds to the region in the afternoon.  Clouds and rain will keep temperatures well below normal, but the snow level is expected to stay above 6000 feet.  High mixing heights and strong transport winds will make for good smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

Saturday will be a break between storms, but the strong westerly jet stream will direct a weaker weather system across mainly the northern half of the state Sunday.  That will keep considerable clouds across the region with temperatures only recovering to near normal.  Slightly warmer conditions are expected Monday.  Daytime smoke dispersal conditions should be good during the period.  The long-range computer models show more weather systems possibly sweeping across northern Oregon during the second half of next week.  That would keep temperatures near to slightly below normal with an increasing chance of showers.


2.  DISPERSION



FRIDAY

Mixing height above 5000 ft throughout the day.  Mixing height lowers to 1500 - 2500 ft during the evening.



Transport wind SSW to SW at 22 - 38 mph during the morning.  Transport wind decreases to WSW to W at 15 - 25 mph during the afternoon and decreases to WSW to WNW at 9 - 15 mph during the evening.



Surface wind SW to WSW at 12 - 24 mph during the morning and afternoon.  Surface wind decreases to WSW to WNW at 5 - 9 mph during the 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 S to SW at 4 - 8 mph during the morning becoming SSW to WSW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming SSW to WSW at 8 - 12 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 12 - 22 mph.  Surface wind SSW to WSW at 8 - 12 mph during the morning becoming WSW to WNW at 10 - 20 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 ENE to ESE at 4 - 8 mph during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N 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, June 4, 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 S through WNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Complete ignitions by 5 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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