SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Tue Jun 1 14:15:21 PDT 2010


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, June 1, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level low remains in the Gulf of Alaska approximately 600 miles west of the Queen Charlotte Islands.  Winds aloft over the Pacific Northwest will be from the west southwest and drive a Pacific weather front through the region during the day.  Rain will spread into the region early and continue throughout the day.  Warm air streaming northward in advance of the front will suppress mixing heights a bit for just fair smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low will be in about the same position on Thursday but the region will be between weather systems for mostly cloudy skies but only widely scattered showers.  Cooler air aloft will push afternoon mixing heights well above 5000 feet for good smoke dispersal conditions. Another active Pacific weather system will move across the Northwest on Friday bringing clouds and significant rain to the area.  The rain will taper off Friday night and by Saturday weak surface high pressure builds to the north for drying and warmer temperatures.  Smoke dispersal conditions will be good to excellent Thursday and Friday, but light and variable winds will limit smoke movement on Saturday.

2.  DISPERSION

WEDNESDAY
Mixing height above 5000 ft during the morning.  Mixing height lowers to 4000 - 5000 ft during the afternoon and evening.

Transport wind SSW to SW at 24 - 42 mph during the morning and afternoon.  Transport wind increases to SSW to WSW at 27 - 47 mph during the evening.

Surface wind SSW to SW at 14 - 28 mph.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 3300 - 4300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 12 - 22 mph.  Surface wind SW to WSW at 8 - 12 mph during the morning becoming SW to WSW at 12 - 22 mph during the afternoon.

FRIDAY
Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 18 - 32 mph during the morning becoming SW to W at 12 - 22 mph during the afternoon.  Surface wind SSW to SW at 10 - 20 mph during the morning becoming SW to W at 9 - 15 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Wednesday, June 2, 2010.
==================================================================

Avoid ignitions within 10 miles to the SSW through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSW through WSW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

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