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

Tue Jun 1 12:43:57 PDT 2010

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From: smi_south_central-bounces at listsmart.osl.state.or.us [mailto:smi_south_central-bounces at listsmart.osl.state.or.us] On Behalf Of ODF Smoke Management Instructions
Sent: Monday, May 31, 2010 01:53 PM
To: smi_south_central at listsmart.osl.state.or.us
Subject: SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

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

ISSUED: Monday, May 31, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level low in the Gulf of Alaska gives west-southwesterly flow aloft over the region.  Minor impulses traveling WSW to NNE in the flow keep scattered showers going through the day.  Skies will be mostly cloudy and smoke dispersal conditions will be fair to good.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low moves slightly west Wednesday and upper flow over the area becomes slightly more southwest.  A more significant impulse drives a Pacific front to the coast early on Wednesday. Rain will spread eastward during the morning and early afternoon.  Smoke dispersal conditions will be fair to good.  On Thursday the southwest flow aloft continues but the region will be between weather systems.  Never the less there will still be enough moisture around for scattered showers.  Slightly warmer surface temperatures should push afternoon mixing heights up a bit for generally good smoke dispersal conditions.  A more significant spring storm will develop Friday as a surface low off the SW Oregon coast.  This will track from SW to NE toward northwest Washington.  Look for rain and brisk winds throughout the day.

2.  DISPERSION

TUESDAY
Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers to 1800 - 2800 ft during the evening.

Transport wind SSW to SW at 9 - 15 mph during the morning.  Transport wind shifts to WSW to WNW at 10 - 18 mph during the afternoon and evening.

Surface wind SSW to SW at 8 - 12 mph during the morning.  Surface wind shifts to WSW to WNW at 9 - 15 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 2900 - 3900 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SW to WSW at 20 - 36 mph.  Surface wind SSW to WSW at 12 - 24 mph.

THURSDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning and through the afternoon.  Transport wind S to SW at 12 - 22 mph during the morning becoming SSW to SW at 25 - 45 mph during the afternoon.  Surface wind SSE to SSW at 8 - 12 mph during the morning becoming S to SSW at 12 - 24 mph during the afternoon.

FRIDAY
Mixing height 2500 - 3500 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SSW to SW at 22 - 38 mph during the morning becoming SW to W at 15 - 29 mph during the afternoon.  Surface wind SSW to SW at 12 - 22 mph during the morning becoming SW to W at 12 - 22 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 Tuesday, June 1, 2010.
==================================================================

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 SSW through WNW in or near drainages leading to SSRAs.  Watch for shifting transport winds.

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