SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Thu Jun 10 14:11:39 PDT 2010


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Thursday, June 10, 2010       2:35 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638



    FRIDAY


The upper-level trough that brought widespread showers to the region Wednesday and Thursday will shift eastward and stretch from Montana to Nevada. A fairly weak upper-level ridge will build just offshore with the flow aloft drying and turning northerly.  That will finally put an end to the long stretch of unseasonably wet weather.  Some showers may linger through the morning, mainly over the eastern mountains, with generally clearing skies in the afternoon.  Transport winds will turn mostly northerly.  Surface temperatures will recover some, from Thursday, but remain below normal.  High afternoon mixing heights should make for good daytime smoke dispersal conditions.  Clearing skies will allow temperatures and mixing heights to quickly drop off in the evening, so residual smoke may settle near the ground.

    OUTLOOK (SATURDAY-MONDAY)

An upper-level ridge will extend from southwestern Oregon to northeastern Washington on Saturday.  Winds aloft and at transport level will turn north-northeasterly with continued drying and warming of the air mass across the region.  After a chilly start, with surface-based morning temperature inversions, plenty of sunshine will help afternoon temperatures recover to near normal.  An offshore cold front is forecast to push the upper-level ridge axis just east of the region by Sunday afternoon.  Temperatures will warm to slightly above normal with light northerly transport winds.  The cold front is forecast to sweep across the region Monday afternoon with a return to onshore flow, cooler temperatures, and a slight chance of mainly mountain showers or thunderstorms. Daytime heating should yield high afternoon mixing heights during the outlook period.


2.  DISPERSION



FRIDAY

Mixing height below 2500 ft early rising to 2800 - 3800 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1800 - 2800 ft during the evening.



Transport wind NNW to NNE at 4 - 8 mph during the morning.  Transport wind increases to NNW to NNE at 10 - 18 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 8 - 14 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 9 - 15 mph.  Surface wind N to NE at 5 - 9 mph.



SUNDAY

Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.  Surface wind light and variable.



MONDAY

Mixing height 2200 to 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph during the morning becoming NW to N at 10 - 20 mph during the afternoon.  Surface wind NW to N at 4 - 8 mph during the morning becoming NW to N at 9 - 15 mph during the afternoon.



3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Friday, June 11, 2010.

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



Avoid ignitions within 12 miles to the NNW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NNW through NE 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. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  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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