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

Thu Apr 15 14:35:46 PDT 2010

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

ISSUED: Thursday, April 15, 2010       2:40 PM      Nick Yonker

****Due to the state furlough day tomorrow, April 16th, the office will not be staffed.  We plan to staff the office on Saturday and Sunday, April 17th and 18th and on the weekends from now on through the spring burning season.****

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

Upper level low is in the eastern Pacific with a high pressure ridge to the east of the state.  The low will continue to bring disturbances toward the region Friday with a chance of afternoon showers or thundershowers.  Air mass will remain mostly unstable under seasonally warm, southerly flow aloft.  Expect mostly good smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

Weather pattern changes little on Saturday from Friday's pattern.  Showers appear unlikely however.  Upper level low moves closer to the state Sunday with an increasing chance of moisture Monday.  Air mass remains fairly unstable Saturday, stabilizes Sunday, and then destabilizes Monday.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 3300 - 4300 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2500 - 3500 ft during the evening.

Transport wind SSE to SSW at 9 - 15 mph during the morning.  Transport wind shifts to SW to W and decreases to 6 - 10 mph during the afternoon and evening.

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

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early rising to 3300 - 4300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SW at 6 - 12 mph during the morning becoming SSW to WSW at 9 - 15 mph during the afternoon.  Surface wind SSE to SW at 6 - 10 mph 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 to 4000 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to W at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 4 - 8 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 20 mph during the morning becoming SW to WSW at 15 - 30 mph during the afternoon.  Surface wind SSE to SSW at 8 - 12 mph during the morning becoming SW to WSW at 9 - 15 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, April 16, 2010.
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        For Friday:

Avoid ignitions within 12 miles to the SSE through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSE through WNW in or near drainages leading to SSRAs.  Watch for shifting transport winds.

For Saturday:

Avoid ignitions within 12 miles to the SSE through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions in or near drainages leading to SSRAs.

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

ISSUED: Thursday, April 15, 2010       2:40 PM      Nick Yonker