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

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Wednesday, May 5, 2010       2:40 PM      Pete Parsons



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


    THURSDAY
The cold upper-level trough that brought very cool and blustery weather, along with a few rain and snow showers, early this week will shift eastward.  Clearing skies and slowly decreasing winds will make for unseasonably cold early morning temperatures with low-level inversions.  However, daytime heating should allow for good afternoon mixing.  A very weak ridge, in a cool and drier northwesterly flow aloft, should bring mostly sunny skies.  Daytime heating will allow for fair to good afternoon mixing with light offshore flow developing.   Temperatures will warm but remain well below normal.

    OUTLOOK (FRIDAY-SUNDAY)
Westerly flow aloft, on Friday, will turn progressively more southwesterly Saturday and Sunday.  Skies will be partly to mostly cloudy with temperatures recovering close to normal.  The chance of showers will increase slightly Friday and Saturday.  An upper-level trough is forecast to move over the region by late Sunday with showers likely.  Nighttime inversions may hold residual smoke close to the ground, through the early morning hours.  Daytime heating will provide good afternoon mixing.  However, northerly transport winds will be fairly light.


2.  DISPERSION



THURSDAY

Mixing height below 500 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 2000 ft during the evening.



Transport wind NE to E at 5 - 9 mph.



Surface wind NE to E at 5 - 9 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind E to SE at 8 - 14 mph during the morning becoming light and variable during the afternoon.  Surface wind ESE to SSE at 5 - 9 mph during the morning becoming light and variable during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through 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 during the morning becoming NW to N at 4 - 8 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind NNW to NNE at 4 - 8 mph during the morning becoming NW to NNW at 8 - 14 mph during the afternoon.  Surface wind NNW to NNE at 4 - 8 mph.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Thursday, May 6, 2010.

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Avoid ignitions within 12 miles to the NNE through ESE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NNE through SE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



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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

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