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: Saturday, May 15, 2010       2:40 PM      Pete Parsons



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


SUNDAY

The upper-level ridge is forecast to progress east of the state with increasing southwesterly flow aloft and southerly to southwesterly transport winds.  Morning inversions will give way to fair to good afternoon mixing.  The threat of showers or thunderstorms will increase in the afternoon with temperatures slightly cooler than on Saturday.

    OUTLOOK (MONDAY-WEDNESDAY)

The flow aloft is forecast to become increasingly moist and unstable Monday, as it turns southerly in response to trough diving into northern California.  Showers and thunderstorms are likely with cooler temperatures.  Afternoon mixing should be good with a strong southerly component to the transport winds.  However, winds may become highly variable near showers and thunderstorms.  The showers will move east of the region by Tuesday afternoon with a drier weak westerly flow aloft and more of a westerly wind component at the transport level.  The flow aloft, and at transport level, is forecast to turn southwesterly on Wednesday, ahead of an approaching cold front.


2.  DISPERSION



SUNDAY

Mixing height below 500 ft early rising to 3400 - 4400 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind S to SW at 8 - 12 mph during the morning.  Transport wind increases to S to SW at 10 - 20 mph during the afternoon then decreases to S to SW at 6 - 10 mph during the evening.



Surface wind S to SW at 8 - 14 mph during the morning and afternoon.  Surface wind decreases to S to SW at 5 - 9 mph during the evening.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising to 4100 - 5000 ft during the afternoon.  Transport wind SE to SSW at 6 - 10 mph during the morning becoming S to SW at 10 - 20 mph during the afternoon.  Surface wind SE to SSW at 4 - 8 mph during the morning becoming SSW to SW at 8 - 14 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind SW to W at 4 - 8 mph during the morning becoming W to NW at 6 - 12 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 20 mph during the morning becoming SSW to SW at 15 - 25 mph during the afternoon.  Surface wind SW to W at 9 - 15 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 Sunday, May 16, 2010.

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Avoid ignitions within 15 miles to the S through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SE through SW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.



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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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