SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Monday, April 25, 2011       2:40 PM      Jim Little



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



TUESDAY



Upper troughiness slowly gives way to weak ridging aloft during the day on Tuesday.  Only limited moisture is available thus expect only a slight chance of showers.  Mixing heights will be at 5000 feet or better during the afternoon for good smoke dispersal conditions while transport winds will be southwesterly most areas.



    OUTLOOK (WEDNESDAY - FRIDAY)



The weak ridging moves east during the day on Wednesday as an upper low moves across the southern Gulf of Alaska toward Vancouver Island.  It will be generally dry except for a chance for some showers in the northeast mountains.  Mixing heights remain high for good smoke dispersal conditions and transport winds should be mostly south to southwest.



The upper low drifts across southern British Columbia on Thursday and another surge of moisture moves in for renewed precipitation.  Much cooler aloft will push mixing heights to above 5000 feet and brisk southwesterly transport winds will be the rule.  This should give continued good smoke dispersal conditions.  On Friday post frontal showers continue with transport winds becoming westerly and diminishing.  Upper level ridging is beginning to build and shift over the area from the west and should lead to dry weather for the weekend.  Mixing heights max out at 5000 feet or above and westerly transport winds indicate good smoke dispersal conditions for Friday.



2.  DISPERSION



TUESDAY

Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.



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



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



OUTLOOK:



WEDNESDAY

Mixing height 1700 - 2700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 20 mph during the morning becoming SW to WSW at 16 - 30 mph during the afternoon.  Surface wind SSW to WSW at 6 - 12 mph during the morning becoming SW to WSW at 12 - 22 mph during the afternoon.



THURSDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind WSW to WNW at 4 - 8 mph.



FRIDAY

Mixing height 2600 - 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind WNW to NNW 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 Tuesday, April 26, 2011.

==================================================================



Avoid ignitions within 12 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through NW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Complete ignitions by 4:00pm.



==============================================================

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_south_central/attachments/20110425/bd18d371/attachment.html>