SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions
ODF Smoke Management Instructions
smi_south_central at listsmart.osl.state.or.us
Sat Nov 13 14:52:25 PST 2010
SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY
ISSUED: Saturday, November 13, 2010 2:40 PM Pete Parsons
1. DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625
A broad upper-level ridge will continue to amplify just offshore. A warm front is forecast to slowly weaken over Oregon, as the flow aloft turns from northwesterly to more northerly and begins to dry out. Skies should remain mostly cloudy with a slight chance of rain. The snow level will rise to near 9,000 feet. Warm air aloft will keep mixing heights suppressed with marginal smoke dispersal conditions.
The offshore ridge will begin to flatten on Monday, allowing a weak weather system to slide down the southern British Columbia coastline. That will maintain at least partly cloudy skies, but it should stay dry with the snow level dropping slightly to near 8000 feet. Ventilation conditions should improve.
Strong northwesterly flow aloft is forecast for Tuesday with a weak weather system bringing some clouds and possibly breezy conditions in the morning. A transitory ridge will allow for afternoon sunbreaks. The snow level will drop to around 6000 feet, with cooling aloft and breezy conditions making for good smoke dispersion.
The flow aloft will turn westerly on Wednesday, as an impressive weather system makes its way southward along the British Columbia coastline. Skies will be partly cloudy. The snow level may rise slightly, ahead of the approaching cold front, but increasing south to southwesterly transport winds should make for fair to good smoke dispersal conditions.
Mixing height below 1000 ft early rising to 1700 - 2700 ft by late morning. Afternoon mixing height rises to 2300 - 3300 ft then lowers to 1200 - 2200 ft during the evening.
Transport wind NNW to N at 12 - 22 mph during the morning and afternoon. Transport wind decreases to WNW to NNW at 10 - 20 mph during the evening.
Surface wind WNW to NNW at 5 - 9 mph.
Mixing height 1200 - 2200 ft during the morning rising to 2300 - 3300 ft during the afternoon. Transport wind WNW to NNW at 8 - 14 mph. Surface wind W to NW at 4 - 8 mph.
Mixing height 3200 - 4200 ft during the morning and through the afternoon. Transport wind WNW to NW at 15 - 29 mph during the morning becoming NW to NNW at 12 - 22 mph during the afternoon. Surface wind WSW to WNW at 8 - 12 mph.
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon. Transport wind S to SW at 6 - 10 mph during the morning becoming WSW to WNW at 15 - 25 mph during the afternoon. Surface wind light and variable during the morning becoming S to SW at 8 - 12 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 Sunday, November 14, 2010.
Avoid ignitions within 15 miles to the WNW through N of SSRAs. For units that will smolder significantly through the night avoid burning within at least 30 miles to the WNW through N in or near drainages leading to SSRAs. Recommend against burning units that will smolder significantly overnight. Complete ignitions by 2:30 p.m.
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:
Please ensure your units have been planned and accomplished by checking:
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