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

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Fri Jun 18 14:24:38 PDT 2010


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Friday, June 18, 2010       2:40 PM      Pete Parsons



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



    SATURDAY


A broad and cool upper-level trough will remain over Washington and Oregon.  The center of an upper-level disturbance, embedded within the broad trough, will slowly sag southward along the Oregon coast.  The counterclockwise circulation around it will produce a moist and somewhat unstable south-southwesterly flow aloft over the state.  Skies will be partly to mostly cloudy with a chance of showers and thundershowers.  High temperatures should cool to about 5-10 degrees below normal.  Daytime heating and cool air aloft will yield high afternoon mixing heights with onshore transport winds.

    OUTLOOK (SUNDAY-TUESDAY)

The center of the embedded upper-level disturbance will move over southwestern Oregon early Sunday and slowly progress eastward, to over southeastern Oregon, by Sunday evening.  Scattered showers are likely Sunday morning but should decrease later in the day, as the flow aloft turns more westerly and air mass begins to stabilize.  High temperatures should remain about 10 degrees below normal with northwesterly transport winds.
A weak and transitory upper-level ridge will move over western Oregon Monday and drift eastward, to over eastern Oregon, on Tuesday.  Progressively more sunshine will help temperatures recover to slightly above normal by Tuesday.  Transport winds will decrease Monday and perhaps become light southerly by Tuesday. High afternoon mixing heights are expected during the outlook period.


2.  DISPERSION



SATURDAY

Mixing height below 1500 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind SW to WNW at 4 - 8 mph throughout the morning and afternoon.  Transport wind shifts to WNW to NNW at 9 - 15 mph during the evening.



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



OUTLOOK:



SUNDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 12 mph during the morning becoming WNW to NNW at 5 - 9 mph during the afternoon.  Surface wind NW to N at 4 - 8 mph.



MONDAY

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



TUESDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SE to S at 6 - 10 mph.  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 Saturday, June 19, 2010.

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



Avoid ignitions within 10 miles to the SW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SW through NNE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



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

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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